ClientType.cs source code in C# .NET

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Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / ClientType.cs / 1305376 / ClientType.cs

                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// type resolver
//  
//--------------------------------------------------------------------- 

namespace System.Data.Services.Client 
{
    #region Namespaces.

    using System; 
    using System.Collections.Generic;
    using System.Data.Services.Common; 
    using System.Diagnostics; 
    using System.Linq;
    using System.Linq.Expressions; 
    using System.Reflection;

    #endregion Namespaces.
 
    /// 
    /// wrapper around a clr type to 
    ///     get/set properties 
    ///     add items to collections
    ///     support open types 
    /// 
    [DebuggerDisplay("{ElementTypeName}")]
    internal sealed class ClientType
    { 
        /// what is the clr full name using ToString for generic name expansion
        internal readonly string ElementTypeName; 
 
        /// what clr type does this represent
        internal readonly Type ElementType; 

        /// if true then EntityType else if !KnownType then ComplexType else PrimitiveType
        internal readonly bool IsEntityType;
 
        /// count of keys on entity type
        internal readonly int KeyCount; 
 
        #region static fields
 
        /// appdomain cache discovered types with properties that we materialize
        private static readonly Dictionary types = new Dictionary(EqualityComparer.Default);

        /// cache <T> and wireName to mapped type 
        private static readonly Dictionary namedTypes = new Dictionary(new TypeNameEqualityComparer());
        #endregion 
 
#if ASTORIA_OPEN_OBJECT
        /// IDictionary<string,object> OpenProperites { get; } 
        private readonly ClientProperty openProperties;
#endif
        /// properties
        private ArraySet properties; 

        /// Property that holds data for ATOM-style media link entries 
        private ClientProperty mediaDataMember; 

        /// Set to true if the type is marked as ATOM-style media link entry 
        private bool mediaLinkEntry;

        /// Souce Epm mappings
        private EpmSourceTree epmSourceTree; 

        /// Target Epm mappings 
        private EpmTargetTree epmTargetTree; 

        ///  
        /// discover and prepare properties for usage
        /// 
        /// type being processed
        /// parameter name 
        /// Whether the skip the check for settable properties.
        private ClientType(Type type, string typeName, bool skipSettableCheck) 
        { 
            Debug.Assert(null != type, "null type");
            Debug.Assert(!String.IsNullOrEmpty(typeName), "empty typeName"); 

            this.ElementTypeName = typeName;
            this.ElementType = Nullable.GetUnderlyingType(type) ?? type;
#if ASTORIA_OPEN_OBJECT 
            string openObjectPropertyName = null;
#endif 
            if (!ClientConvert.IsKnownType(this.ElementType)) 
            {
#if ASTORIA_OPEN_OBJECT 
                #region OpenObject determined by walking type hierarchy and looking for [OpenObjectAttribute("PropertyName")]
                Type openObjectDeclared = this.ElementType;
                for (Type tmp = openObjectDeclared; (null != tmp) && (typeof(object) != tmp); tmp = tmp.BaseType)
                { 
                    object[] attributes = openObjectDeclared.GetCustomAttributes(typeof(OpenObjectAttribute), false);
                    if (1 == attributes.Length) 
                    { 
                        if (null != openObjectPropertyName)
                        { 
                            throw Error.InvalidOperation(Strings.Clienttype_MultipleOpenProperty(this.ElementTypeName));
                        }

                        openObjectPropertyName = ((OpenObjectAttribute)attributes[0]).OpenObjectPropertyName; 
                        openObjectDeclared = tmp;
                    } 
                } 
                #endregion
#endif 

                Type keyPropertyDeclaredType = null;
                bool isEntity = type.GetCustomAttributes(true).OfType().Any();
                DataServiceKeyAttribute dska = type.GetCustomAttributes(true).OfType().FirstOrDefault(); 
                foreach (PropertyInfo pinfo in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
                { 
                    //// examples where class 

                    //// the normal examples 
                    //// PropertyType Property { get; set }
                    //// Nullable Property { get; set; }

                    //// if 'Property: struct' then we would be unable set the property during construction (and have them stick) 
                    //// but when its a class, we can navigate if non-null and set the nested properties
                    //// PropertyType Property { get; } where PropertyType: class 
 
                    //// we do support adding elements to collections
                    //// ICollection { get; /*ignored set;*/ } 

                    //// indexed properties are not suported because
                    //// we don't have anything to use as the index
                    //// PropertyType Property[object x] { /*ignored get;*/ /*ignored set;*/ } 

                    //// also ignored 
                    //// if PropertyType.IsPointer (like byte*) 
                    //// if PropertyType.IsArray except for byte[] and char[]
                    //// if PropertyType == IntPtr or UIntPtr 

                    Type ptype = pinfo.PropertyType; // class / interface / value
                    ptype = Nullable.GetUnderlyingType(ptype) ?? ptype;
 
                    if (ptype.IsPointer ||
                        (ptype.IsArray && (typeof(byte[]) != ptype) && typeof(char[]) != ptype) || 
                        (typeof(IntPtr) == ptype) || 
                        (typeof(UIntPtr) == ptype))
                    { 
                        continue;
                    }

                    Debug.Assert(!ptype.ContainsGenericParameters, "remove when test case is found that encounters this"); 

                    if (pinfo.CanRead && 
                        (!ptype.IsValueType || pinfo.CanWrite) && 
                        !ptype.ContainsGenericParameters &&
                        (0 == pinfo.GetIndexParameters().Length)) 
                    {
                        #region IsKey?
                        bool keyProperty = dska != null ? dska.KeyNames.Contains(pinfo.Name) : false;
 
                        if (keyProperty)
                        { 
                            if (null == keyPropertyDeclaredType) 
                            {
                                keyPropertyDeclaredType = pinfo.DeclaringType; 
                            }
                            else if (keyPropertyDeclaredType != pinfo.DeclaringType)
                            {
                                throw Error.InvalidOperation(Strings.ClientType_KeysOnDifferentDeclaredType(this.ElementTypeName)); 
                            }
 
                            if (!ClientConvert.IsKnownType(ptype)) 
                            {
                                throw Error.InvalidOperation(Strings.ClientType_KeysMustBeSimpleTypes(this.ElementTypeName)); 
                            }

                            this.KeyCount++;
                        } 
                        #endregion
 
#if ASTORIA_OPEN_OBJECT 
                        #region IsOpenObjectProperty?
                        bool openProperty = (openObjectPropertyName == pinfo.Name) && 
                                              typeof(IDictionary).IsAssignableFrom(ptype);
                        Debug.Assert(keyProperty != openProperty || (!keyProperty && !openProperty), "key can't be open type");
                        #endregion
 
                        ClientProperty property = new ClientProperty(pinfo, ptype, keyProperty, openProperty);
 
                        if (!property.OpenObjectProperty) 
#else
                        ClientProperty property = new ClientProperty(pinfo, ptype, keyProperty); 
#endif
                        {
                            if (!this.properties.Add(property, ClientProperty.NameEquality))
                            { 
                                // 2nd property with same name shadows another property
                                int shadow = this.IndexOfProperty(property.PropertyName); 
                                if (!property.DeclaringType.IsAssignableFrom(this.properties[shadow].DeclaringType)) 
                                {   // the new property is on the most derived class
                                    this.properties.RemoveAt(shadow); 
                                    this.properties.Add(property, null);
                                }
                            }
                        } 
#if ASTORIA_OPEN_OBJECT
                        else 
                        { 
                            if (pinfo.DeclaringType == openObjectDeclared)
                            { 
                                this.openProperties = property;
                            }
                        }
#endif 
                    }
                } 
 
                #region No KeyAttribute, discover key by name pattern { DeclaringType.Name+ID, ID }
                if (null == keyPropertyDeclaredType) 
                {
                    ClientProperty key = null;
                    for (int i = this.properties.Count - 1; 0 <= i; --i)
                    { 
                        string propertyName = this.properties[i].PropertyName;
                        if (propertyName.EndsWith("ID", StringComparison.Ordinal)) 
                        { 
                            string declaringTypeName = this.properties[i].DeclaringType.Name;
                            if ((propertyName.Length == (declaringTypeName.Length + 2)) && 
                                propertyName.StartsWith(declaringTypeName, StringComparison.Ordinal))
                            {
                                // matched "DeclaringType.Name+ID" pattern
                                if ((null == keyPropertyDeclaredType) || 
                                    this.properties[i].DeclaringType.IsAssignableFrom(keyPropertyDeclaredType))
                                { 
                                    keyPropertyDeclaredType = this.properties[i].DeclaringType; 
                                    key = this.properties[i];
                                } 
                            }
                            else if ((null == keyPropertyDeclaredType) && (2 == propertyName.Length))
                            {
                                // matched "ID" pattern 
                                keyPropertyDeclaredType = this.properties[i].DeclaringType;
                                key = this.properties[i]; 
                            } 
                        }
                    } 

                    if (null != key)
                    {
                        Debug.Assert(0 == this.KeyCount, "shouldn't have a key yet"); 
                        key.KeyProperty = true;
                        this.KeyCount++; 
                    } 
                }
                else if (this.KeyCount != dska.KeyNames.Count) 
                {
                    var m = (from string a in dska.KeyNames
                             where null == (from b in this.properties
                                            where b.PropertyName == a 
                                            select b).FirstOrDefault()
                             select a).First(); 
                    throw Error.InvalidOperation(Strings.ClientType_MissingProperty(this.ElementTypeName, m)); 
                }
                #endregion 

                this.IsEntityType = (null != keyPropertyDeclaredType) || isEntity;
                Debug.Assert(this.KeyCount == this.Properties.Where(k => k.KeyProperty).Count(), "KeyCount mismatch");
 
                this.WireUpMimeTypeProperties();
                this.CheckMediaLinkEntry(); 
 
                if (!skipSettableCheck)
                { 
#if ASTORIA_OPEN_OBJECT
                    if ((0 == this.properties.Count) && (null == this.openProperties))
#else
                    if (0 == this.properties.Count) 
#endif
                    {   // implicit construction? 
                        throw Error.InvalidOperation(Strings.ClientType_NoSettableFields(this.ElementTypeName)); 
                    }
                } 
            }

            this.properties.TrimToSize();
            this.properties.Sort(ClientProperty.GetPropertyName, String.CompareOrdinal); 

#if ASTORIA_OPEN_OBJECT 
            #region Validate OpenObjectAttribute was used 
            if ((null != openObjectPropertyName) && (null == this.openProperties))
            { 
                throw Error.InvalidOperation(Strings.ClientType_MissingOpenProperty(this.ElementTypeName, openObjectPropertyName));
            }

            Debug.Assert((null != openObjectPropertyName) == (null != this.openProperties), "OpenProperties mismatch"); 
            #endregion
#endif 
            this.BuildEpmInfo(type); 
        }
 
        /// Properties sorted by name
        internal ArraySet Properties
        {
            get { return this.properties; } 
        }
 
        /// Property that holds data for ATOM-style media link entries 
        internal ClientProperty MediaDataMember
        { 
            get { return this.mediaDataMember; }
        }

        /// Returns true if the type is marked as ATOM-style media link entry 
        internal bool IsMediaLinkEntry
        { 
            get { return this.mediaLinkEntry; } 
        }
 
        /// 
        /// Source tree for s on this type
        /// 
        internal EpmSourceTree EpmSourceTree 
        {
            get 
            { 
                if (this.epmSourceTree == null)
                { 
                    this.epmTargetTree = new EpmTargetTree();
                    this.epmSourceTree = new EpmSourceTree(this.epmTargetTree);
                }
 
                return this.epmSourceTree;
            } 
        } 

        ///  
        /// Target tree for s on this type
        /// 
        internal EpmTargetTree EpmTargetTree
        { 
            get
            { 
                Debug.Assert(this.epmTargetTree != null, "Must have valid target tree"); 
                return this.epmTargetTree;
            } 
        }

        /// Are there any entity property mappings on this type
        internal bool HasEntityPropertyMappings 
        {
            get 
            { 
                return this.epmSourceTree != null;
            } 
        }

        /// The mappings for friendly feeds are V1 compatible or not
        internal bool EpmIsV1Compatible 
        {
            get 
            { 
                return !this.HasEntityPropertyMappings || this.EpmTargetTree.IsV1Compatible;
            } 
        }

        /// Whether a variable of  can be assigned null.
        /// Type to check. 
        /// true if a variable of type  can be assigned null; false otherwise.
        internal static bool CanAssignNull(Type type) 
        { 
            Debug.Assert(type != null, "type != null");
            return !type.IsValueType || (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable<>))); 
        }

        /// 
        /// Is the type or element type (in the case of nullableOfT or IEnumOfT) a Entity Type? 
        /// 
        /// Type to examine 
        /// bool indicating whether or not entity type 
        internal static bool CheckElementTypeIsEntity(Type t)
        { 
            t = TypeSystem.GetElementType(t);
            t = Nullable.GetUnderlyingType(t) ?? t;
            return ClientType.Create(t, false).IsEntityType;
        } 

        ///  
        /// get a client type resolver 
        /// 
        /// type to wrap 
        /// client type
        internal static ClientType Create(Type type)
        {
            return Create(type, true /* expectModelType */); 
        }
 
        ///  
        /// get a client type resolver
        ///  
        /// type to wrap
        /// Whether the type is expected to be a model type.
        /// client type
        internal static ClientType Create(Type type, bool expectModelType) 
        {
            ClientType clientType; 
            lock (ClientType.types) 
            {
                ClientType.types.TryGetValue(type, out clientType); 
            }

            if (null == clientType)
            { 
                if (CommonUtil.IsUnsupportedType(type))
                { 
                    throw new InvalidOperationException(Strings.ClientType_UnsupportedType(type)); 
                }
 
                bool skipSettableCheck = !expectModelType;
                clientType = new ClientType(type, type.ToString(), skipSettableCheck); // ToString expands generic type name where as FullName does not
                if (expectModelType)
                { 
                    lock (ClientType.types)
                    { 
                        ClientType existing; 
                        if (ClientType.types.TryGetValue(type, out existing))
                        { 
                            clientType = existing;
                        }
                        else
                        { 
                            ClientType.types.Add(type, clientType);
                        } 
                    } 
                }
            } 

            return clientType;
        }
 
#if !ASTORIA_LIGHT
        ///  
        /// resolve the wireName/userType pair to a CLR type 
        /// 
        /// type name sent by server 
        /// type passed by user or on propertyType from a class
        /// mapped clr type
        internal static Type ResolveFromName(string wireName, Type userType)
#else 
        /// 
        /// resolve the wireName/userType pair to a CLR type 
        ///  
        /// type name sent by server
        /// type passed by user or on propertyType from a class 
        /// typeof context for strongly typed assembly
        /// mapped clr type
        internal static Type ResolveFromName(string wireName, Type userType, Type contextType)
#endif 
        {
            Type foundType; 
 
            TypeName typename;
            typename.Type = userType; 
            typename.Name = wireName;

            // search the "wirename"-userType key in type cache
            bool foundInCache; 
            lock (ClientType.namedTypes)
            { 
                foundInCache = ClientType.namedTypes.TryGetValue(typename, out foundType); 
            }
 
            // at this point, if we have seen this type before, we either have the resolved type "foundType",
            // or we have tried to resolve it before but did not success, in which case foundType will be null.
            // Either way we should return what's in the cache since the result is unlikely to change.
            // We only need to keep on searching if there isn't an entry in the cache. 
            if (!foundInCache)
            { 
                string name = wireName; 
                int index = wireName.LastIndexOf('.');
                if ((0 <= index) && (index < wireName.Length - 1)) 
                {
                    name = wireName.Substring(index + 1);
                }
 
                if (userType.Name == name)
                { 
                    foundType = userType; 
                }
                else 
                {
#if !ASTORIA_LIGHT
                    // searching only loaded assemblies, not referenced assemblies
                    foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies()) 
#else
                    foreach (Assembly assembly in new Assembly[] { userType.Assembly, contextType.Assembly }.Distinct()) 
#endif 
                    {
                        Type found = assembly.GetType(wireName, false); 
                        ResolveSubclass(name, userType, found, ref foundType);

                        if (null == found)
                        { 
                            Type[] types = null;
                            try 
                            { 
                                types = assembly.GetTypes();
                            } 
                            catch (ReflectionTypeLoadException)
                            {
                            }
 
                            if (null != types)
                            { 
                                foreach (Type t in types) 
                                {
                                    ResolveSubclass(name, userType, t, ref foundType); 
                                }
                            }
                        }
                    } 
                }
 
                // The above search can all fail and leave "foundType" to be null 
                // we should cache this result too so we won't waste time searching again.
                lock (ClientType.namedTypes) 
                {
                    ClientType.namedTypes[typename] = foundType;
                }
            } 

            return foundType; 
        } 

        ///  
        /// get concrete type that implements the genericTypeDefinitation
        /// 
        /// starting type
        /// the generic type definition to find 
        /// concrete type that implementats the generic type
        internal static Type GetImplementationType(Type propertyType, Type genericTypeDefinition) 
        { 
            if (IsConstructedGeneric(propertyType, genericTypeDefinition))
            {   // propertyType is ICollection 
                return propertyType;
            }
            else
            { 
                Type implementationType = null;
                foreach (Type interfaceType in propertyType.GetInterfaces()) 
                { 
                    if (IsConstructedGeneric(interfaceType, genericTypeDefinition))
                    { 
                        if (null == implementationType)
                        {   // found implmentation of ICollection
                            implementationType = interfaceType;
                        } 
                        else
                        {   // ICollection and ICollection 
                            throw Error.NotSupported(Strings.ClientType_MultipleImplementationNotSupported); 
                        }
                    } 
                }

                return implementationType;
            } 
        }
 
        ///  
        /// Gets the Add method to add items to a collection of the specified type.
        ///  
        /// Type for the collection.
        /// The element type in the collection if found; null otherwise.
        /// The method to invoke to add to a collection of the specified type.
        internal static MethodInfo GetAddToCollectionMethod(Type collectionType, out Type type) 
        {
            return GetCollectionMethod(collectionType, typeof(ICollection<>), "Add", out type); 
        } 

        ///  
        /// Gets the Remove method to remove items from a collection of the specified type.
        /// 
        /// Type for the collection.
        /// The element type in the collection if found; null otherwise. 
        /// The method to invoke to remove from a collection of the specified type.
        internal static MethodInfo GetRemoveFromCollectionMethod(Type collectionType, out Type type) 
        { 
            return GetCollectionMethod(collectionType, typeof(ICollection<>), "Remove", out type);
        } 

        /// 
        /// get element type, resolves ICollection and Nullable
        ///  
        /// starting type
        /// the generic type definition to find 
        /// the method to search for 
        /// the collection type if found
        /// element types 
        internal static MethodInfo GetCollectionMethod(Type propertyType, Type genericTypeDefinition, string methodName, out Type type)
        {
            Debug.Assert(null != propertyType, "null propertyType");
            Debug.Assert(null != genericTypeDefinition, "null genericTypeDefinition"); 
            Debug.Assert(genericTypeDefinition.IsGenericTypeDefinition, "!IsGenericTypeDefinition");
 
            type = null; 

            Type implementationType = GetImplementationType(propertyType, genericTypeDefinition); 
            if (null != implementationType)
            {
                Type[] genericArguments = implementationType.GetGenericArguments();
                MethodInfo methodInfo = implementationType.GetMethod(methodName); 
                Debug.Assert(null != methodInfo, "should have found the method");
 
#if DEBUG 
                Debug.Assert(null != genericArguments, "null genericArguments");
                ParameterInfo[] parameters = methodInfo.GetParameters(); 
                if (0 < parameters.Length)
                {
                    // following assert was disabled for Contains which returns bool
                    // Debug.Assert(typeof(void) == methodInfo.ReturnParameter.ParameterType, "method doesn't return void"); 

                    Debug.Assert(genericArguments.Length == parameters.Length, "genericArguments don't match parameters"); 
                    for (int i = 0; i < genericArguments.Length; ++i) 
                    {
                        Debug.Assert(genericArguments[i] == parameters[i].ParameterType, "parameter doesn't match generic argument"); 
                    }
                }
#endif
                type = genericArguments[genericArguments.Length - 1]; 
                return methodInfo;
            } 
 
            return null;
        } 

        /// 
        /// create object using default constructor
        ///  
        /// instance of propertyType
        internal object CreateInstance() 
        { 
            return Activator.CreateInstance(this.ElementType);
        } 

        /// 
        /// get property wrapper for a property name, might be method around open types for otherwise unknown properties
        ///  
        /// property name
        /// are missing properties ignored 
        /// property wrapper 
        /// for unknown properties on closed types
        internal ClientProperty GetProperty(string propertyName, bool ignoreMissingProperties) 
        {
            int index = this.IndexOfProperty(propertyName);
            if (0 <= index)
            { 
                return this.properties[index];
            } 
#if ASTORIA_OPEN_OBJECT 
            else if (null != this.openProperties)
            { 
                return this.openProperties;
            }
#endif
            else if (!ignoreMissingProperties) 
            {
                throw Error.InvalidOperation(Strings.ClientType_MissingProperty(this.ElementTypeName, propertyName)); 
            } 

            return null; 
        }

        /// 
        /// Checks whether the specified  is a 
        /// closed constructed type of the generic type.
        ///  
        /// Type to check. 
        /// Generic type for checkin.
        /// true if  is a constructed type of . 
        /// The check is an immediate check; no inheritance rules are applied.
        private static bool IsConstructedGeneric(Type type, Type genericTypeDefinition)
        {
            Debug.Assert(type != null, "type != null"); 
            Debug.Assert(!type.ContainsGenericParameters, "remove when test case is found that encounters this");
            Debug.Assert(genericTypeDefinition != null, "genericTypeDefinition != null"); 
 
            return type.IsGenericType && (type.GetGenericTypeDefinition() == genericTypeDefinition) && !type.ContainsGenericParameters;
        } 

        /// 
        /// is the type a visible subclass with correct name
        ///  
        /// type name from server
        /// the type from user for materialization or property type 
        /// type being tested 
        /// the previously discovered matching type
        /// if the mapping is ambiguous 
        private static void ResolveSubclass(string wireClassName, Type userType, Type type, ref Type existing)
        {
            if ((null != type) && type.IsVisible && (wireClassName == type.Name) && userType.IsAssignableFrom(type))
            { 
                if (null != existing)
                { 
                    throw Error.InvalidOperation(Strings.ClientType_Ambiguous(wireClassName, userType)); 
                }
 
                existing = type;
            }
        }
 
        /// 
        /// By going over EntityPropertyMappingInfoAttribute(s) defined on  
        /// builds the corresponding EntityPropertyMappingInfo 
        /// 
        /// Type being looked at 
        private void BuildEpmInfo(Type type)
        {
            if (type.BaseType != null && type.BaseType != typeof(object))
            { 
                this.BuildEpmInfo(type.BaseType);
            } 
 
            foreach (EntityPropertyMappingAttribute epmAttr in type.GetCustomAttributes(typeof(EntityPropertyMappingAttribute), false))
            { 
                this.BuildEpmInfo(epmAttr, type);
            }
        }
 
        /// 
        /// Builds the EntityPropertyMappingInfo corresponding to an EntityPropertyMappingAttribute, also builds the delegate to 
        /// be invoked in order to retrieve the property provided in the  
        /// 
        /// Source EntityPropertyMappingAttribute 
        /// ResourceType on which to look for the property
        private void BuildEpmInfo(EntityPropertyMappingAttribute epmAttr, Type definingType)
        {
            ParameterExpression rsrcParam = Expression.Parameter(this.ElementType, "rsrc"); 
            ClientProperty rsrcProp = null;
 
            // We don't need to check for null/empty status of the source path because it is already checked 
            // in the constructor for EntityPropertyMappingAttribute
            Expression propValReaderExpr = this.BuildPropertyReader( 
                                                        rsrcParam,
                                                        this,
                                                        epmAttr.SourcePath.Split('/'),
                                                        0, 
                                                        ref rsrcProp);
 
            Delegate dlgPropValReader = Expression.Lambda(propValReaderExpr, rsrcParam).Compile(); 
            this.EpmSourceTree.Add(new EntityPropertyMappingInfo { Attribute = epmAttr, PropValReader = dlgPropValReader, DefiningType = definingType });
        } 

        /// 
        /// Given a source property path in segmented form, creates the correponding delegate that reads the
        /// property value from the resource type instance 
        /// 
        /// Generated expression tree 
        /// Resource type whose property is to be read 
        /// Collection of property names used for resource type property lookup
        /// Index of current property name in  
        /// Final resource property object that the  refers to
        /// Expression tree which results in access to property value
        private Expression BuildPropertyReader(Expression expr, ClientType rsrcType, String[] srcPathSegments, int currentSegment, ref ClientProperty rsrcProp)
        { 
            if (currentSegment == srcPathSegments.Length)
            { 
                if (Util.TypeAllowsNull(expr.Type)) 
                {
                    return expr; 
                }
                else
                {
                    return Expression.Convert(expr, typeof(Nullable<>).MakeGenericType(expr.Type)); 
                }
            } 
 
            String srcPathPart = srcPathSegments[currentSegment];
 
            rsrcProp = rsrcType.GetProperty(srcPathPart, true);
            if (rsrcProp == null)
            {
                throw Error.InvalidOperation(Strings.EpmSourceTree_InaccessiblePropertyOnType(srcPathPart, rsrcType.ElementTypeName)); 
            }
 
                // If this is the last part of the path, then it has to be a primitive type otherwise should be a complex type 
            if (rsrcProp.IsKnownType ^ (currentSegment == srcPathSegments.Length - 1))
            { 
                throw Error.InvalidOperation(!rsrcProp.IsKnownType ? Strings.EpmClientType_PropertyIsComplex(rsrcProp.PropertyName) :
                                                                     Strings.EpmClientType_PropertyIsPrimitive(rsrcProp.PropertyName));
            }
 
            // o.Prop
            MemberExpression objectDotProp = Expression.Property(expr, srcPathPart); 
 
            Expression recursiveExpr = this.BuildPropertyReader(
                                            objectDotProp, 
                                            rsrcProp.IsKnownType ? null : ClientType.Create(rsrcProp.PropertyType),
                                            srcPathSegments,
                                            ++currentSegment,
                                            ref rsrcProp); 

            // o == null 
            BinaryExpression objectIsNull = Expression.Equal(expr, Expression.Constant(null)); 

            // if (o == null) then null; else o.Prop; 
            ConstantExpression nullableNull = Expression.Constant(
                            null,
                            Util.GetTypeAllowingNull(rsrcProp.PropertyType));
 
            // if (o == null) then null; else o.Prop;
            return Expression.Condition(objectIsNull, nullableNull, recursiveExpr); 
        } 

        /// get the index of a property 
        /// propertyName
        /// index else -1
        private int IndexOfProperty(string propertyName)
        { 
            return this.properties.IndexOf(propertyName, ClientProperty.GetPropertyName, String.Equals);
        } 
 
        /// 
        /// Find properties with dynamic MIME type related properties and 
        /// set the references from each ClientProperty to its related MIME type property
        /// 
        private void WireUpMimeTypeProperties()
        { 
            MimeTypePropertyAttribute attribute = (MimeTypePropertyAttribute)this.ElementType.GetCustomAttributes(typeof(MimeTypePropertyAttribute), true).SingleOrDefault();
            if (null != attribute) 
            { 
                int dataIndex, mimeTypeIndex;
                if ((0 > (dataIndex = this.IndexOfProperty(attribute.DataPropertyName))) || 
                    (0 > (mimeTypeIndex = this.IndexOfProperty(attribute.MimeTypePropertyName))))
                {
                    throw Error.InvalidOperation(Strings.ClientType_MissingMimeTypeProperty(attribute.DataPropertyName, attribute.MimeTypePropertyName));
                } 

                Debug.Assert(0 <= dataIndex, "missing data property"); 
                Debug.Assert(0 <= mimeTypeIndex, "missing mime type property"); 
                this.Properties[dataIndex].MimeTypeProperty = this.Properties[mimeTypeIndex];
            } 
        }

        /// 
        /// Check if this type represents an ATOM-style media link entry and 
        /// if so mark the ClientType as such
        ///  
        private void CheckMediaLinkEntry() 
        {
            object[] attributes = this.ElementType.GetCustomAttributes(typeof(MediaEntryAttribute), true); 
            if (attributes != null && attributes.Length > 0)
            {
                Debug.Assert(attributes.Length == 1, "The AttributeUsage in the attribute definition should be preventing more than 1 per property");
 
                MediaEntryAttribute mediaEntryAttribute = (MediaEntryAttribute)attributes[0];
                this.mediaLinkEntry = true; 
 
                int index = this.IndexOfProperty(mediaEntryAttribute.MediaMemberName);
                if (index < 0) 
                {
                    throw Error.InvalidOperation(Strings.ClientType_MissingMediaEntryProperty(
                        mediaEntryAttribute.MediaMemberName));
                } 

                this.mediaDataMember = this.properties[index]; 
            } 

            attributes = this.ElementType.GetCustomAttributes(typeof(HasStreamAttribute), true); 
            if (attributes != null && attributes.Length > 0)
            {
                Debug.Assert(attributes.Length == 1, "The AttributeUsage in the attribute definition should be preventing more than 1 per property");
                this.mediaLinkEntry = true; 
            }
        } 
 
        /// type + wireName combination
        private struct TypeName 
        {
            /// type
            internal Type Type;
 
            /// type name from server
            internal string Name; 
        } 

        ///  
        /// wrapper around property methods
        /// 
        [DebuggerDisplay("{PropertyName}")]
        internal sealed class ClientProperty 
        {
            /// property name for debugging 
            internal readonly string PropertyName; 

            /// Exact property type; possibly nullable but not necessarily so. 
            internal readonly Type NullablePropertyType;

            /// type of the property
            internal readonly Type PropertyType; 

            /// what is the nested collection element 
            internal readonly Type CollectionType; 

            ///  
            /// Is this a known primitive/reference type or an entity/complex/collection type?
            /// 
            internal readonly bool IsKnownType;
 
#if ASTORIA_OPEN_OBJECT
            /// IDictionary<string,object> OpenProperites { get; } 
            internal readonly bool OpenObjectProperty; 
#endif
 
            /// property getter
            private readonly MethodInfo propertyGetter;

            /// property setter 
            private readonly MethodInfo propertySetter;
 
            /// "set_Item" method supporting IDictionary properties 
            private readonly MethodInfo setMethod;
 
            /// "Add" method supporting ICollection<> properties
            private readonly MethodInfo addMethod;

            /// "Remove" method supporting ICollection<> properties 
            private readonly MethodInfo removeMethod;
 
            /// "Contains" method support ICollection<> properties 
            private readonly MethodInfo containsMethod;
 
            /// IsKeyProperty?
            private bool keyProperty;

            /// The other property in this type that holds the MIME type for this one 
            private ClientProperty mimeTypeProperty;
 
#if ASTORIA_OPEN_OBJECT 
            /// 
            /// constructor 
            /// 
            /// property
            /// propertyType
            /// keyProperty 
            /// openObjectProperty
            internal ClientProperty(PropertyInfo property, Type propertyType, bool keyProperty, bool openObjectProperty) 
#else 
            /// 
            /// constructor 
            /// 
            /// property
            /// propertyType
            /// Whether this property is part of the key for its declaring type. 
            internal ClientProperty(PropertyInfo property, Type propertyType, bool keyProperty)
#endif 
            { 
                Debug.Assert(null != property, "null property");
                Debug.Assert(null != propertyType, "null propertyType"); 
                Debug.Assert(null == Nullable.GetUnderlyingType(propertyType), "should already have been denullified");

                this.PropertyName = property.Name;
                this.NullablePropertyType = property.PropertyType; 
                this.PropertyType = propertyType;
                this.propertyGetter = property.GetGetMethod(); 
                this.propertySetter = property.GetSetMethod(); 
                this.keyProperty = keyProperty;
#if ASTORIA_OPEN_OBJECT 
                this.OpenObjectProperty = openObjectProperty;
#endif

                this.IsKnownType = ClientConvert.IsKnownType(propertyType); 
                if (!this.IsKnownType)
                { 
                    this.setMethod = GetCollectionMethod(this.PropertyType, typeof(IDictionary<,>), "set_Item", out this.CollectionType); 
                    if (null == this.setMethod)
                    { 
                        this.containsMethod = GetCollectionMethod(this.PropertyType, typeof(ICollection<>), "Contains", out this.CollectionType);
                        this.addMethod = GetAddToCollectionMethod(this.PropertyType, out this.CollectionType);
                        this.removeMethod = GetRemoveFromCollectionMethod(this.PropertyType, out this.CollectionType);
                    } 
                }
 
                Debug.Assert(!this.keyProperty || this.IsKnownType, "can't have an random type as key"); 
            }
 
            /// what type was this property declared on?
            internal Type DeclaringType
            {
                get { return this.propertyGetter.DeclaringType; } 
            }
 
            /// Does this property particpate in the primary key? 
            internal bool KeyProperty
            { 
                get { return this.keyProperty; }
                set { this.keyProperty = value; }
            }
 
            /// The other property in this type that holds the MIME type for this one
            internal ClientProperty MimeTypeProperty 
            { 
                get { return this.mimeTypeProperty; }
                set { this.mimeTypeProperty = value; } 
            }

            /// get KeyProperty
            /// x 
            /// KeyProperty
            internal static bool GetKeyProperty(ClientProperty x) 
            { 
                return x.KeyProperty;
            } 

            /// get property name
            /// x
            /// PropertyName 
            internal static string GetPropertyName(ClientProperty x)
            { 
                return x.PropertyName; 
            }
 
            /// compare name equality
            /// x
            /// y
            /// true if the property names are equal; false otherwise. 
            internal static bool NameEquality(ClientProperty x, ClientProperty y)
            { 
                return String.Equals(x.PropertyName, y.PropertyName); 
            }
 
            /// 
            /// get property value from an object
            /// 
            /// object to get the property value from 
            /// property value
            internal object GetValue(object instance) 
            { 
                Debug.Assert(null != instance, "null instance");
                Debug.Assert(null != this.propertyGetter, "null propertyGetter"); 
                return this.propertyGetter.Invoke(instance, null);
            }

            ///  
            /// remove a item from collection
            ///  
            /// collection 
            /// item to remove
            internal void RemoveValue(object instance, object value) 
            {
                Debug.Assert(null != instance, "null instance");
                Debug.Assert(null != this.removeMethod, "missing removeMethod");
 
                Debug.Assert(this.PropertyType.IsAssignableFrom(instance.GetType()), "unexpected collection instance");
                Debug.Assert((null == value) || this.CollectionType.IsAssignableFrom(value.GetType()), "unexpected collection value to add"); 
                this.removeMethod.Invoke(instance, new object[] { value }); 
            }
 
#if ASTORIA_OPEN_OBJECT
            /// 
            /// set property value on an object
            ///  
            /// object to set the property value on
            /// property value 
            /// used for open type 
            /// allow add to a collection if available, else allow setting collection property
            /// cached OpenProperties dictionary 
            internal void SetValue(object instance, object value, string propertyName, ref object openProperties, bool allowAdd)
#else
            /// 
            /// set property value on an object 
            /// 
            /// object to set the property value on 
            /// property value 
            /// used for open type
            /// allow add to a collection if available, else allow setting collection property 
            internal void SetValue(object instance, object value, string propertyName, bool allowAdd)
#endif
            {
                Debug.Assert(null != instance, "null instance"); 
                if (null != this.setMethod)
                { 
#if ASTORIA_OPEN_OBJECT 
                    if (this.OpenObjectProperty)
                    { 
                        if (null == openProperties)
                        {
                            if (null == (openProperties = this.propertyGetter.Invoke(instance, null)))
                            { 
                                throw Error.NotSupported(Strings.ClientType_NullOpenProperties(this.PropertyName));
                            } 
                        } 

                        ((IDictionary)openProperties)[propertyName] = value; 
                    }
                    else
#endif
                    { 
                        Debug.Assert(this.PropertyType.IsAssignableFrom(instance.GetType()), "unexpected dictionary instance");
                        Debug.Assert((null == value) || this.CollectionType.IsAssignableFrom(value.GetType()), "unexpected dictionary value to set"); 
 
                        // ((IDictionary)instance)[propertyName] = (CollectionType)value;
                        this.setMethod.Invoke(instance, new object[] { propertyName, value }); 
                    }
                }
                else if (allowAdd && (null != this.addMethod))
                { 
                    Debug.Assert(this.PropertyType.IsAssignableFrom(instance.GetType()), "unexpected collection instance");
                    Debug.Assert((null == value) || this.CollectionType.IsAssignableFrom(value.GetType()), "unexpected collection value to add"); 
 
                    // ((ICollection)instance).Add((CollectionType)value);
                    if (!(bool)this.containsMethod.Invoke(instance, new object[] { value })) 
                    {
                        this.addMethod.Invoke(instance, new object[] { value });
                    }
                } 
                else if (null != this.propertySetter)
                { 
                    Debug.Assert((null == value) || this.PropertyType.IsAssignableFrom(value.GetType()), "unexpected property value to set"); 

                    // ((ElementType)instance).PropertyName = (PropertyType)value; 
                    this.propertySetter.Invoke(instance, new object[] { value });
                }
                else
                { 
                    throw Error.InvalidOperation(Strings.ClientType_MissingProperty(value.GetType().ToString(), propertyName));
                } 
            } 
        }
 
        /// equality comparer for TypeName
        private sealed class TypeNameEqualityComparer : IEqualityComparer
        {
            /// equality comparer for TypeName 
            /// left type
            /// right type 
            /// true if x and y are equal 
            public bool Equals(TypeName x, TypeName y)
            { 
                return (x.Type == y.Type && x.Name == y.Name);
            }

            /// compute hashcode for TypeName 
            /// object to compute hashcode for
            /// computed hashcode 
            public int GetHashCode(TypeName obj) 
            {
                return obj.Type.GetHashCode() ^ obj.Name.GetHashCode(); 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// type resolver
//  
//--------------------------------------------------------------------- 

namespace System.Data.Services.Client 
{
    #region Namespaces.

    using System; 
    using System.Collections.Generic;
    using System.Data.Services.Common; 
    using System.Diagnostics; 
    using System.Linq;
    using System.Linq.Expressions; 
    using System.Reflection;

    #endregion Namespaces.
 
    /// 
    /// wrapper around a clr type to 
    ///     get/set properties 
    ///     add items to collections
    ///     support open types 
    /// 
    [DebuggerDisplay("{ElementTypeName}")]
    internal sealed class ClientType
    { 
        /// what is the clr full name using ToString for generic name expansion
        internal readonly string ElementTypeName; 
 
        /// what clr type does this represent
        internal readonly Type ElementType; 

        /// if true then EntityType else if !KnownType then ComplexType else PrimitiveType
        internal readonly bool IsEntityType;
 
        /// count of keys on entity type
        internal readonly int KeyCount; 
 
        #region static fields
 
        /// appdomain cache discovered types with properties that we materialize
        private static readonly Dictionary types = new Dictionary(EqualityComparer.Default);

        /// cache <T> and wireName to mapped type 
        private static readonly Dictionary namedTypes = new Dictionary(new TypeNameEqualityComparer());
        #endregion 
 
#if ASTORIA_OPEN_OBJECT
        /// IDictionary<string,object> OpenProperites { get; } 
        private readonly ClientProperty openProperties;
#endif
        /// properties
        private ArraySet properties; 

        /// Property that holds data for ATOM-style media link entries 
        private ClientProperty mediaDataMember; 

        /// Set to true if the type is marked as ATOM-style media link entry 
        private bool mediaLinkEntry;

        /// Souce Epm mappings
        private EpmSourceTree epmSourceTree; 

        /// Target Epm mappings 
        private EpmTargetTree epmTargetTree; 

        ///  
        /// discover and prepare properties for usage
        /// 
        /// type being processed
        /// parameter name 
        /// Whether the skip the check for settable properties.
        private ClientType(Type type, string typeName, bool skipSettableCheck) 
        { 
            Debug.Assert(null != type, "null type");
            Debug.Assert(!String.IsNullOrEmpty(typeName), "empty typeName"); 

            this.ElementTypeName = typeName;
            this.ElementType = Nullable.GetUnderlyingType(type) ?? type;
#if ASTORIA_OPEN_OBJECT 
            string openObjectPropertyName = null;
#endif 
            if (!ClientConvert.IsKnownType(this.ElementType)) 
            {
#if ASTORIA_OPEN_OBJECT 
                #region OpenObject determined by walking type hierarchy and looking for [OpenObjectAttribute("PropertyName")]
                Type openObjectDeclared = this.ElementType;
                for (Type tmp = openObjectDeclared; (null != tmp) && (typeof(object) != tmp); tmp = tmp.BaseType)
                { 
                    object[] attributes = openObjectDeclared.GetCustomAttributes(typeof(OpenObjectAttribute), false);
                    if (1 == attributes.Length) 
                    { 
                        if (null != openObjectPropertyName)
                        { 
                            throw Error.InvalidOperation(Strings.Clienttype_MultipleOpenProperty(this.ElementTypeName));
                        }

                        openObjectPropertyName = ((OpenObjectAttribute)attributes[0]).OpenObjectPropertyName; 
                        openObjectDeclared = tmp;
                    } 
                } 
                #endregion
#endif 

                Type keyPropertyDeclaredType = null;
                bool isEntity = type.GetCustomAttributes(true).OfType().Any();
                DataServiceKeyAttribute dska = type.GetCustomAttributes(true).OfType().FirstOrDefault(); 
                foreach (PropertyInfo pinfo in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
                { 
                    //// examples where class 

                    //// the normal examples 
                    //// PropertyType Property { get; set }
                    //// Nullable Property { get; set; }

                    //// if 'Property: struct' then we would be unable set the property during construction (and have them stick) 
                    //// but when its a class, we can navigate if non-null and set the nested properties
                    //// PropertyType Property { get; } where PropertyType: class 
 
                    //// we do support adding elements to collections
                    //// ICollection { get; /*ignored set;*/ } 

                    //// indexed properties are not suported because
                    //// we don't have anything to use as the index
                    //// PropertyType Property[object x] { /*ignored get;*/ /*ignored set;*/ } 

                    //// also ignored 
                    //// if PropertyType.IsPointer (like byte*) 
                    //// if PropertyType.IsArray except for byte[] and char[]
                    //// if PropertyType == IntPtr or UIntPtr 

                    Type ptype = pinfo.PropertyType; // class / interface / value
                    ptype = Nullable.GetUnderlyingType(ptype) ?? ptype;
 
                    if (ptype.IsPointer ||
                        (ptype.IsArray && (typeof(byte[]) != ptype) && typeof(char[]) != ptype) || 
                        (typeof(IntPtr) == ptype) || 
                        (typeof(UIntPtr) == ptype))
                    { 
                        continue;
                    }

                    Debug.Assert(!ptype.ContainsGenericParameters, "remove when test case is found that encounters this"); 

                    if (pinfo.CanRead && 
                        (!ptype.IsValueType || pinfo.CanWrite) && 
                        !ptype.ContainsGenericParameters &&
                        (0 == pinfo.GetIndexParameters().Length)) 
                    {
                        #region IsKey?
                        bool keyProperty = dska != null ? dska.KeyNames.Contains(pinfo.Name) : false;
 
                        if (keyProperty)
                        { 
                            if (null == keyPropertyDeclaredType) 
                            {
                                keyPropertyDeclaredType = pinfo.DeclaringType; 
                            }
                            else if (keyPropertyDeclaredType != pinfo.DeclaringType)
                            {
                                throw Error.InvalidOperation(Strings.ClientType_KeysOnDifferentDeclaredType(this.ElementTypeName)); 
                            }
 
                            if (!ClientConvert.IsKnownType(ptype)) 
                            {
                                throw Error.InvalidOperation(Strings.ClientType_KeysMustBeSimpleTypes(this.ElementTypeName)); 
                            }

                            this.KeyCount++;
                        } 
                        #endregion
 
#if ASTORIA_OPEN_OBJECT 
                        #region IsOpenObjectProperty?
                        bool openProperty = (openObjectPropertyName == pinfo.Name) && 
                                              typeof(IDictionary).IsAssignableFrom(ptype);
                        Debug.Assert(keyProperty != openProperty || (!keyProperty && !openProperty), "key can't be open type");
                        #endregion
 
                        ClientProperty property = new ClientProperty(pinfo, ptype, keyProperty, openProperty);
 
                        if (!property.OpenObjectProperty) 
#else
                        ClientProperty property = new ClientProperty(pinfo, ptype, keyProperty); 
#endif
                        {
                            if (!this.properties.Add(property, ClientProperty.NameEquality))
                            { 
                                // 2nd property with same name shadows another property
                                int shadow = this.IndexOfProperty(property.PropertyName); 
                                if (!property.DeclaringType.IsAssignableFrom(this.properties[shadow].DeclaringType)) 
                                {   // the new property is on the most derived class
                                    this.properties.RemoveAt(shadow); 
                                    this.properties.Add(property, null);
                                }
                            }
                        } 
#if ASTORIA_OPEN_OBJECT
                        else 
                        { 
                            if (pinfo.DeclaringType == openObjectDeclared)
                            { 
                                this.openProperties = property;
                            }
                        }
#endif 
                    }
                } 
 
                #region No KeyAttribute, discover key by name pattern { DeclaringType.Name+ID, ID }
                if (null == keyPropertyDeclaredType) 
                {
                    ClientProperty key = null;
                    for (int i = this.properties.Count - 1; 0 <= i; --i)
                    { 
                        string propertyName = this.properties[i].PropertyName;
                        if (propertyName.EndsWith("ID", StringComparison.Ordinal)) 
                        { 
                            string declaringTypeName = this.properties[i].DeclaringType.Name;
                            if ((propertyName.Length == (declaringTypeName.Length + 2)) && 
                                propertyName.StartsWith(declaringTypeName, StringComparison.Ordinal))
                            {
                                // matched "DeclaringType.Name+ID" pattern
                                if ((null == keyPropertyDeclaredType) || 
                                    this.properties[i].DeclaringType.IsAssignableFrom(keyPropertyDeclaredType))
                                { 
                                    keyPropertyDeclaredType = this.properties[i].DeclaringType; 
                                    key = this.properties[i];
                                } 
                            }
                            else if ((null == keyPropertyDeclaredType) && (2 == propertyName.Length))
                            {
                                // matched "ID" pattern 
                                keyPropertyDeclaredType = this.properties[i].DeclaringType;
                                key = this.properties[i]; 
                            } 
                        }
                    } 

                    if (null != key)
                    {
                        Debug.Assert(0 == this.KeyCount, "shouldn't have a key yet"); 
                        key.KeyProperty = true;
                        this.KeyCount++; 
                    } 
                }
                else if (this.KeyCount != dska.KeyNames.Count) 
                {
                    var m = (from string a in dska.KeyNames
                             where null == (from b in this.properties
                                            where b.PropertyName == a 
                                            select b).FirstOrDefault()
                             select a).First(); 
                    throw Error.InvalidOperation(Strings.ClientType_MissingProperty(this.ElementTypeName, m)); 
                }
                #endregion 

                this.IsEntityType = (null != keyPropertyDeclaredType) || isEntity;
                Debug.Assert(this.KeyCount == this.Properties.Where(k => k.KeyProperty).Count(), "KeyCount mismatch");
 
                this.WireUpMimeTypeProperties();
                this.CheckMediaLinkEntry(); 
 
                if (!skipSettableCheck)
                { 
#if ASTORIA_OPEN_OBJECT
                    if ((0 == this.properties.Count) && (null == this.openProperties))
#else
                    if (0 == this.properties.Count) 
#endif
                    {   // implicit construction? 
                        throw Error.InvalidOperation(Strings.ClientType_NoSettableFields(this.ElementTypeName)); 
                    }
                } 
            }

            this.properties.TrimToSize();
            this.properties.Sort(ClientProperty.GetPropertyName, String.CompareOrdinal); 

#if ASTORIA_OPEN_OBJECT 
            #region Validate OpenObjectAttribute was used 
            if ((null != openObjectPropertyName) && (null == this.openProperties))
            { 
                throw Error.InvalidOperation(Strings.ClientType_MissingOpenProperty(this.ElementTypeName, openObjectPropertyName));
            }

            Debug.Assert((null != openObjectPropertyName) == (null != this.openProperties), "OpenProperties mismatch"); 
            #endregion
#endif 
            this.BuildEpmInfo(type); 
        }
 
        /// Properties sorted by name
        internal ArraySet Properties
        {
            get { return this.properties; } 
        }
 
        /// Property that holds data for ATOM-style media link entries 
        internal ClientProperty MediaDataMember
        { 
            get { return this.mediaDataMember; }
        }

        /// Returns true if the type is marked as ATOM-style media link entry 
        internal bool IsMediaLinkEntry
        { 
            get { return this.mediaLinkEntry; } 
        }
 
        /// 
        /// Source tree for s on this type
        /// 
        internal EpmSourceTree EpmSourceTree 
        {
            get 
            { 
                if (this.epmSourceTree == null)
                { 
                    this.epmTargetTree = new EpmTargetTree();
                    this.epmSourceTree = new EpmSourceTree(this.epmTargetTree);
                }
 
                return this.epmSourceTree;
            } 
        } 

        ///  
        /// Target tree for s on this type
        /// 
        internal EpmTargetTree EpmTargetTree
        { 
            get
            { 
                Debug.Assert(this.epmTargetTree != null, "Must have valid target tree"); 
                return this.epmTargetTree;
            } 
        }

        /// Are there any entity property mappings on this type
        internal bool HasEntityPropertyMappings 
        {
            get 
            { 
                return this.epmSourceTree != null;
            } 
        }

        /// The mappings for friendly feeds are V1 compatible or not
        internal bool EpmIsV1Compatible 
        {
            get 
            { 
                return !this.HasEntityPropertyMappings || this.EpmTargetTree.IsV1Compatible;
            } 
        }

        /// Whether a variable of  can be assigned null.
        /// Type to check. 
        /// true if a variable of type  can be assigned null; false otherwise.
        internal static bool CanAssignNull(Type type) 
        { 
            Debug.Assert(type != null, "type != null");
            return !type.IsValueType || (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable<>))); 
        }

        /// 
        /// Is the type or element type (in the case of nullableOfT or IEnumOfT) a Entity Type? 
        /// 
        /// Type to examine 
        /// bool indicating whether or not entity type 
        internal static bool CheckElementTypeIsEntity(Type t)
        { 
            t = TypeSystem.GetElementType(t);
            t = Nullable.GetUnderlyingType(t) ?? t;
            return ClientType.Create(t, false).IsEntityType;
        } 

        ///  
        /// get a client type resolver 
        /// 
        /// type to wrap 
        /// client type
        internal static ClientType Create(Type type)
        {
            return Create(type, true /* expectModelType */); 
        }
 
        ///  
        /// get a client type resolver
        ///  
        /// type to wrap
        /// Whether the type is expected to be a model type.
        /// client type
        internal static ClientType Create(Type type, bool expectModelType) 
        {
            ClientType clientType; 
            lock (ClientType.types) 
            {
                ClientType.types.TryGetValue(type, out clientType); 
            }

            if (null == clientType)
            { 
                if (CommonUtil.IsUnsupportedType(type))
                { 
                    throw new InvalidOperationException(Strings.ClientType_UnsupportedType(type)); 
                }
 
                bool skipSettableCheck = !expectModelType;
                clientType = new ClientType(type, type.ToString(), skipSettableCheck); // ToString expands generic type name where as FullName does not
                if (expectModelType)
                { 
                    lock (ClientType.types)
                    { 
                        ClientType existing; 
                        if (ClientType.types.TryGetValue(type, out existing))
                        { 
                            clientType = existing;
                        }
                        else
                        { 
                            ClientType.types.Add(type, clientType);
                        } 
                    } 
                }
            } 

            return clientType;
        }
 
#if !ASTORIA_LIGHT
        ///  
        /// resolve the wireName/userType pair to a CLR type 
        /// 
        /// type name sent by server 
        /// type passed by user or on propertyType from a class
        /// mapped clr type
        internal static Type ResolveFromName(string wireName, Type userType)
#else 
        /// 
        /// resolve the wireName/userType pair to a CLR type 
        ///  
        /// type name sent by server
        /// type passed by user or on propertyType from a class 
        /// typeof context for strongly typed assembly
        /// mapped clr type
        internal static Type ResolveFromName(string wireName, Type userType, Type contextType)
#endif 
        {
            Type foundType; 
 
            TypeName typename;
            typename.Type = userType; 
            typename.Name = wireName;

            // search the "wirename"-userType key in type cache
            bool foundInCache; 
            lock (ClientType.namedTypes)
            { 
                foundInCache = ClientType.namedTypes.TryGetValue(typename, out foundType); 
            }
 
            // at this point, if we have seen this type before, we either have the resolved type "foundType",
            // or we have tried to resolve it before but did not success, in which case foundType will be null.
            // Either way we should return what's in the cache since the result is unlikely to change.
            // We only need to keep on searching if there isn't an entry in the cache. 
            if (!foundInCache)
            { 
                string name = wireName; 
                int index = wireName.LastIndexOf('.');
                if ((0 <= index) && (index < wireName.Length - 1)) 
                {
                    name = wireName.Substring(index + 1);
                }
 
                if (userType.Name == name)
                { 
                    foundType = userType; 
                }
                else 
                {
#if !ASTORIA_LIGHT
                    // searching only loaded assemblies, not referenced assemblies
                    foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies()) 
#else
                    foreach (Assembly assembly in new Assembly[] { userType.Assembly, contextType.Assembly }.Distinct()) 
#endif 
                    {
                        Type found = assembly.GetType(wireName, false); 
                        ResolveSubclass(name, userType, found, ref foundType);

                        if (null == found)
                        { 
                            Type[] types = null;
                            try 
                            { 
                                types = assembly.GetTypes();
                            } 
                            catch (ReflectionTypeLoadException)
                            {
                            }
 
                            if (null != types)
                            { 
                                foreach (Type t in types) 
                                {
                                    ResolveSubclass(name, userType, t, ref foundType); 
                                }
                            }
                        }
                    } 
                }
 
                // The above search can all fail and leave "foundType" to be null 
                // we should cache this result too so we won't waste time searching again.
                lock (ClientType.namedTypes) 
                {
                    ClientType.namedTypes[typename] = foundType;
                }
            } 

            return foundType; 
        } 

        ///  
        /// get concrete type that implements the genericTypeDefinitation
        /// 
        /// starting type
        /// the generic type definition to find 
        /// concrete type that implementats the generic type
        internal static Type GetImplementationType(Type propertyType, Type genericTypeDefinition) 
        { 
            if (IsConstructedGeneric(propertyType, genericTypeDefinition))
            {   // propertyType is ICollection 
                return propertyType;
            }
            else
            { 
                Type implementationType = null;
                foreach (Type interfaceType in propertyType.GetInterfaces()) 
                { 
                    if (IsConstructedGeneric(interfaceType, genericTypeDefinition))
                    { 
                        if (null == implementationType)
                        {   // found implmentation of ICollection
                            implementationType = interfaceType;
                        } 
                        else
                        {   // ICollection and ICollection 
                            throw Error.NotSupported(Strings.ClientType_MultipleImplementationNotSupported); 
                        }
                    } 
                }

                return implementationType;
            } 
        }
 
        ///  
        /// Gets the Add method to add items to a collection of the specified type.
        ///  
        /// Type for the collection.
        /// The element type in the collection if found; null otherwise.
        /// The method to invoke to add to a collection of the specified type.
        internal static MethodInfo GetAddToCollectionMethod(Type collectionType, out Type type) 
        {
            return GetCollectionMethod(collectionType, typeof(ICollection<>), "Add", out type); 
        } 

        ///  
        /// Gets the Remove method to remove items from a collection of the specified type.
        /// 
        /// Type for the collection.
        /// The element type in the collection if found; null otherwise. 
        /// The method to invoke to remove from a collection of the specified type.
        internal static MethodInfo GetRemoveFromCollectionMethod(Type collectionType, out Type type) 
        { 
            return GetCollectionMethod(collectionType, typeof(ICollection<>), "Remove", out type);
        } 

        /// 
        /// get element type, resolves ICollection and Nullable
        ///  
        /// starting type
        /// the generic type definition to find 
        /// the method to search for 
        /// the collection type if found
        /// element types 
        internal static MethodInfo GetCollectionMethod(Type propertyType, Type genericTypeDefinition, string methodName, out Type type)
        {
            Debug.Assert(null != propertyType, "null propertyType");
            Debug.Assert(null != genericTypeDefinition, "null genericTypeDefinition"); 
            Debug.Assert(genericTypeDefinition.IsGenericTypeDefinition, "!IsGenericTypeDefinition");
 
            type = null; 

            Type implementationType = GetImplementationType(propertyType, genericTypeDefinition); 
            if (null != implementationType)
            {
                Type[] genericArguments = implementationType.GetGenericArguments();
                MethodInfo methodInfo = implementationType.GetMethod(methodName); 
                Debug.Assert(null != methodInfo, "should have found the method");
 
#if DEBUG 
                Debug.Assert(null != genericArguments, "null genericArguments");
                ParameterInfo[] parameters = methodInfo.GetParameters(); 
                if (0 < parameters.Length)
                {
                    // following assert was disabled for Contains which returns bool
                    // Debug.Assert(typeof(void) == methodInfo.ReturnParameter.ParameterType, "method doesn't return void"); 

                    Debug.Assert(genericArguments.Length == parameters.Length, "genericArguments don't match parameters"); 
                    for (int i = 0; i < genericArguments.Length; ++i) 
                    {
                        Debug.Assert(genericArguments[i] == parameters[i].ParameterType, "parameter doesn't match generic argument"); 
                    }
                }
#endif
                type = genericArguments[genericArguments.Length - 1]; 
                return methodInfo;
            } 
 
            return null;
        } 

        /// 
        /// create object using default constructor
        ///  
        /// instance of propertyType
        internal object CreateInstance() 
        { 
            return Activator.CreateInstance(this.ElementType);
        } 

        /// 
        /// get property wrapper for a property name, might be method around open types for otherwise unknown properties
        ///  
        /// property name
        /// are missing properties ignored 
        /// property wrapper 
        /// for unknown properties on closed types
        internal ClientProperty GetProperty(string propertyName, bool ignoreMissingProperties) 
        {
            int index = this.IndexOfProperty(propertyName);
            if (0 <= index)
            { 
                return this.properties[index];
            } 
#if ASTORIA_OPEN_OBJECT 
            else if (null != this.openProperties)
            { 
                return this.openProperties;
            }
#endif
            else if (!ignoreMissingProperties) 
            {
                throw Error.InvalidOperation(Strings.ClientType_MissingProperty(this.ElementTypeName, propertyName)); 
            } 

            return null; 
        }

        /// 
        /// Checks whether the specified  is a 
        /// closed constructed type of the generic type.
        ///  
        /// Type to check. 
        /// Generic type for checkin.
        /// true if  is a constructed type of . 
        /// The check is an immediate check; no inheritance rules are applied.
        private static bool IsConstructedGeneric(Type type, Type genericTypeDefinition)
        {
            Debug.Assert(type != null, "type != null"); 
            Debug.Assert(!type.ContainsGenericParameters, "remove when test case is found that encounters this");
            Debug.Assert(genericTypeDefinition != null, "genericTypeDefinition != null"); 
 
            return type.IsGenericType && (type.GetGenericTypeDefinition() == genericTypeDefinition) && !type.ContainsGenericParameters;
        } 

        /// 
        /// is the type a visible subclass with correct name
        ///  
        /// type name from server
        /// the type from user for materialization or property type 
        /// type being tested 
        /// the previously discovered matching type
        /// if the mapping is ambiguous 
        private static void ResolveSubclass(string wireClassName, Type userType, Type type, ref Type existing)
        {
            if ((null != type) && type.IsVisible && (wireClassName == type.Name) && userType.IsAssignableFrom(type))
            { 
                if (null != existing)
                { 
                    throw Error.InvalidOperation(Strings.ClientType_Ambiguous(wireClassName, userType)); 
                }
 
                existing = type;
            }
        }
 
        /// 
        /// By going over EntityPropertyMappingInfoAttribute(s) defined on  
        /// builds the corresponding EntityPropertyMappingInfo 
        /// 
        /// Type being looked at 
        private void BuildEpmInfo(Type type)
        {
            if (type.BaseType != null && type.BaseType != typeof(object))
            { 
                this.BuildEpmInfo(type.BaseType);
            } 
 
            foreach (EntityPropertyMappingAttribute epmAttr in type.GetCustomAttributes(typeof(EntityPropertyMappingAttribute), false))
            { 
                this.BuildEpmInfo(epmAttr, type);
            }
        }
 
        /// 
        /// Builds the EntityPropertyMappingInfo corresponding to an EntityPropertyMappingAttribute, also builds the delegate to 
        /// be invoked in order to retrieve the property provided in the  
        /// 
        /// Source EntityPropertyMappingAttribute 
        /// ResourceType on which to look for the property
        private void BuildEpmInfo(EntityPropertyMappingAttribute epmAttr, Type definingType)
        {
            ParameterExpression rsrcParam = Expression.Parameter(this.ElementType, "rsrc"); 
            ClientProperty rsrcProp = null;
 
            // We don't need to check for null/empty status of the source path because it is already checked 
            // in the constructor for EntityPropertyMappingAttribute
            Expression propValReaderExpr = this.BuildPropertyReader( 
                                                        rsrcParam,
                                                        this,
                                                        epmAttr.SourcePath.Split('/'),
                                                        0, 
                                                        ref rsrcProp);
 
            Delegate dlgPropValReader = Expression.Lambda(propValReaderExpr, rsrcParam).Compile(); 
            this.EpmSourceTree.Add(new EntityPropertyMappingInfo { Attribute = epmAttr, PropValReader = dlgPropValReader, DefiningType = definingType });
        } 

        /// 
        /// Given a source property path in segmented form, creates the correponding delegate that reads the
        /// property value from the resource type instance 
        /// 
        /// Generated expression tree 
        /// Resource type whose property is to be read 
        /// Collection of property names used for resource type property lookup
        /// Index of current property name in  
        /// Final resource property object that the  refers to
        /// Expression tree which results in access to property value
        private Expression BuildPropertyReader(Expression expr, ClientType rsrcType, String[] srcPathSegments, int currentSegment, ref ClientProperty rsrcProp)
        { 
            if (currentSegment == srcPathSegments.Length)
            { 
                if (Util.TypeAllowsNull(expr.Type)) 
                {
                    return expr; 
                }
                else
                {
                    return Expression.Convert(expr, typeof(Nullable<>).MakeGenericType(expr.Type)); 
                }
            } 
 
            String srcPathPart = srcPathSegments[currentSegment];
 
            rsrcProp = rsrcType.GetProperty(srcPathPart, true);
            if (rsrcProp == null)
            {
                throw Error.InvalidOperation(Strings.EpmSourceTree_InaccessiblePropertyOnType(srcPathPart, rsrcType.ElementTypeName)); 
            }
 
                // If this is the last part of the path, then it has to be a primitive type otherwise should be a complex type 
            if (rsrcProp.IsKnownType ^ (currentSegment == srcPathSegments.Length - 1))
            { 
                throw Error.InvalidOperation(!rsrcProp.IsKnownType ? Strings.EpmClientType_PropertyIsComplex(rsrcProp.PropertyName) :
                                                                     Strings.EpmClientType_PropertyIsPrimitive(rsrcProp.PropertyName));
            }
 
            // o.Prop
            MemberExpression objectDotProp = Expression.Property(expr, srcPathPart); 
 
            Expression recursiveExpr = this.BuildPropertyReader(
                                            objectDotProp, 
                                            rsrcProp.IsKnownType ? null : ClientType.Create(rsrcProp.PropertyType),
                                            srcPathSegments,
                                            ++currentSegment,
                                            ref rsrcProp); 

            // o == null 
            BinaryExpression objectIsNull = Expression.Equal(expr, Expression.Constant(null)); 

            // if (o == null) then null; else o.Prop; 
            ConstantExpression nullableNull = Expression.Constant(
                            null,
                            Util.GetTypeAllowingNull(rsrcProp.PropertyType));
 
            // if (o == null) then null; else o.Prop;
            return Expression.Condition(objectIsNull, nullableNull, recursiveExpr); 
        } 

        /// get the index of a property 
        /// propertyName
        /// index else -1
        private int IndexOfProperty(string propertyName)
        { 
            return this.properties.IndexOf(propertyName, ClientProperty.GetPropertyName, String.Equals);
        } 
 
        /// 
        /// Find properties with dynamic MIME type related properties and 
        /// set the references from each ClientProperty to its related MIME type property
        /// 
        private void WireUpMimeTypeProperties()
        { 
            MimeTypePropertyAttribute attribute = (MimeTypePropertyAttribute)this.ElementType.GetCustomAttributes(typeof(MimeTypePropertyAttribute), true).SingleOrDefault();
            if (null != attribute) 
            { 
                int dataIndex, mimeTypeIndex;
                if ((0 > (dataIndex = this.IndexOfProperty(attribute.DataPropertyName))) || 
                    (0 > (mimeTypeIndex = this.IndexOfProperty(attribute.MimeTypePropertyName))))
                {
                    throw Error.InvalidOperation(Strings.ClientType_MissingMimeTypeProperty(attribute.DataPropertyName, attribute.MimeTypePropertyName));
                } 

                Debug.Assert(0 <= dataIndex, "missing data property"); 
                Debug.Assert(0 <= mimeTypeIndex, "missing mime type property"); 
                this.Properties[dataIndex].MimeTypeProperty = this.Properties[mimeTypeIndex];
            } 
        }

        /// 
        /// Check if this type represents an ATOM-style media link entry and 
        /// if so mark the ClientType as such
        ///  
        private void CheckMediaLinkEntry() 
        {
            object[] attributes = this.ElementType.GetCustomAttributes(typeof(MediaEntryAttribute), true); 
            if (attributes != null && attributes.Length > 0)
            {
                Debug.Assert(attributes.Length == 1, "The AttributeUsage in the attribute definition should be preventing more than 1 per property");
 
                MediaEntryAttribute mediaEntryAttribute = (MediaEntryAttribute)attributes[0];
                this.mediaLinkEntry = true; 
 
                int index = this.IndexOfProperty(mediaEntryAttribute.MediaMemberName);
                if (index < 0) 
                {
                    throw Error.InvalidOperation(Strings.ClientType_MissingMediaEntryProperty(
                        mediaEntryAttribute.MediaMemberName));
                } 

                this.mediaDataMember = this.properties[index]; 
            } 

            attributes = this.ElementType.GetCustomAttributes(typeof(HasStreamAttribute), true); 
            if (attributes != null && attributes.Length > 0)
            {
                Debug.Assert(attributes.Length == 1, "The AttributeUsage in the attribute definition should be preventing more than 1 per property");
                this.mediaLinkEntry = true; 
            }
        } 
 
        /// type + wireName combination
        private struct TypeName 
        {
            /// type
            internal Type Type;
 
            /// type name from server
            internal string Name; 
        } 

        ///  
        /// wrapper around property methods
        /// 
        [DebuggerDisplay("{PropertyName}")]
        internal sealed class ClientProperty 
        {
            /// property name for debugging 
            internal readonly string PropertyName; 

            /// Exact property type; possibly nullable but not necessarily so. 
            internal readonly Type NullablePropertyType;

            /// type of the property
            internal readonly Type PropertyType; 

            /// what is the nested collection element 
            internal readonly Type CollectionType; 

            ///  
            /// Is this a known primitive/reference type or an entity/complex/collection type?
            /// 
            internal readonly bool IsKnownType;
 
#if ASTORIA_OPEN_OBJECT
            /// IDictionary<string,object> OpenProperites { get; } 
            internal readonly bool OpenObjectProperty; 
#endif
 
            /// property getter
            private readonly MethodInfo propertyGetter;

            /// property setter 
            private readonly MethodInfo propertySetter;
 
            /// "set_Item" method supporting IDictionary properties 
            private readonly MethodInfo setMethod;
 
            /// "Add" method supporting ICollection<> properties
            private readonly MethodInfo addMethod;

            /// "Remove" method supporting ICollection<> properties 
            private readonly MethodInfo removeMethod;
 
            /// "Contains" method support ICollection<> properties 
            private readonly MethodInfo containsMethod;
 
            /// IsKeyProperty?
            private bool keyProperty;

            /// The other property in this type that holds the MIME type for this one 
            private ClientProperty mimeTypeProperty;
 
#if ASTORIA_OPEN_OBJECT 
            /// 
            /// constructor 
            /// 
            /// property
            /// propertyType
            /// keyProperty 
            /// openObjectProperty
            internal ClientProperty(PropertyInfo property, Type propertyType, bool keyProperty, bool openObjectProperty) 
#else 
            /// 
            /// constructor 
            /// 
            /// property
            /// propertyType
            /// Whether this property is part of the key for its declaring type. 
            internal ClientProperty(PropertyInfo property, Type propertyType, bool keyProperty)
#endif 
            { 
                Debug.Assert(null != property, "null property");
                Debug.Assert(null != propertyType, "null propertyType"); 
                Debug.Assert(null == Nullable.GetUnderlyingType(propertyType), "should already have been denullified");

                this.PropertyName = property.Name;
                this.NullablePropertyType = property.PropertyType; 
                this.PropertyType = propertyType;
                this.propertyGetter = property.GetGetMethod(); 
                this.propertySetter = property.GetSetMethod(); 
                this.keyProperty = keyProperty;
#if ASTORIA_OPEN_OBJECT 
                this.OpenObjectProperty = openObjectProperty;
#endif

                this.IsKnownType = ClientConvert.IsKnownType(propertyType); 
                if (!this.IsKnownType)
                { 
                    this.setMethod = GetCollectionMethod(this.PropertyType, typeof(IDictionary<,>), "set_Item", out this.CollectionType); 
                    if (null == this.setMethod)
                    { 
                        this.containsMethod = GetCollectionMethod(this.PropertyType, typeof(ICollection<>), "Contains", out this.CollectionType);
                        this.addMethod = GetAddToCollectionMethod(this.PropertyType, out this.CollectionType);
                        this.removeMethod = GetRemoveFromCollectionMethod(this.PropertyType, out this.CollectionType);
                    } 
                }
 
                Debug.Assert(!this.keyProperty || this.IsKnownType, "can't have an random type as key"); 
            }
 
            /// what type was this property declared on?
            internal Type DeclaringType
            {
                get { return this.propertyGetter.DeclaringType; } 
            }
 
            /// Does this property particpate in the primary key? 
            internal bool KeyProperty
            { 
                get { return this.keyProperty; }
                set { this.keyProperty = value; }
            }
 
            /// The other property in this type that holds the MIME type for this one
            internal ClientProperty MimeTypeProperty 
            { 
                get { return this.mimeTypeProperty; }
                set { this.mimeTypeProperty = value; } 
            }

            /// get KeyProperty
            /// x 
            /// KeyProperty
            internal static bool GetKeyProperty(ClientProperty x) 
            { 
                return x.KeyProperty;
            } 

            /// get property name
            /// x
            /// PropertyName 
            internal static string GetPropertyName(ClientProperty x)
            { 
                return x.PropertyName; 
            }
 
            /// compare name equality
            /// x
            /// y
            /// true if the property names are equal; false otherwise. 
            internal static bool NameEquality(ClientProperty x, ClientProperty y)
            { 
                return String.Equals(x.PropertyName, y.PropertyName); 
            }
 
            /// 
            /// get property value from an object
            /// 
            /// object to get the property value from 
            /// property value
            internal object GetValue(object instance) 
            { 
                Debug.Assert(null != instance, "null instance");
                Debug.Assert(null != this.propertyGetter, "null propertyGetter"); 
                return this.propertyGetter.Invoke(instance, null);
            }

            ///  
            /// remove a item from collection
            ///  
            /// collection 
            /// item to remove
            internal void RemoveValue(object instance, object value) 
            {
                Debug.Assert(null != instance, "null instance");
                Debug.Assert(null != this.removeMethod, "missing removeMethod");
 
                Debug.Assert(this.PropertyType.IsAssignableFrom(instance.GetType()), "unexpected collection instance");
                Debug.Assert((null == value) || this.CollectionType.IsAssignableFrom(value.GetType()), "unexpected collection value to add"); 
                this.removeMethod.Invoke(instance, new object[] { value }); 
            }
 
#if ASTORIA_OPEN_OBJECT
            /// 
            /// set property value on an object
            ///  
            /// object to set the property value on
            /// property value 
            /// used for open type 
            /// allow add to a collection if available, else allow setting collection property
            /// cached OpenProperties dictionary 
            internal void SetValue(object instance, object value, string propertyName, ref object openProperties, bool allowAdd)
#else
            /// 
            /// set property value on an object 
            /// 
            /// object to set the property value on 
            /// property value 
            /// used for open type
            /// allow add to a collection if available, else allow setting collection property 
            internal void SetValue(object instance, object value, string propertyName, bool allowAdd)
#endif
            {
                Debug.Assert(null != instance, "null instance"); 
                if (null != this.setMethod)
                { 
#if ASTORIA_OPEN_OBJECT 
                    if (this.OpenObjectProperty)
                    { 
                        if (null == openProperties)
                        {
                            if (null == (openProperties = this.propertyGetter.Invoke(instance, null)))
                            { 
                                throw Error.NotSupported(Strings.ClientType_NullOpenProperties(this.PropertyName));
                            } 
                        } 

                        ((IDictionary)openProperties)[propertyName] = value; 
                    }
                    else
#endif
                    { 
                        Debug.Assert(this.PropertyType.IsAssignableFrom(instance.GetType()), "unexpected dictionary instance");
                        Debug.Assert((null == value) || this.CollectionType.IsAssignableFrom(value.GetType()), "unexpected dictionary value to set"); 
 
                        // ((IDictionary)instance)[propertyName] = (CollectionType)value;
                        this.setMethod.Invoke(instance, new object[] { propertyName, value }); 
                    }
                }
                else if (allowAdd && (null != this.addMethod))
                { 
                    Debug.Assert(this.PropertyType.IsAssignableFrom(instance.GetType()), "unexpected collection instance");
                    Debug.Assert((null == value) || this.CollectionType.IsAssignableFrom(value.GetType()), "unexpected collection value to add"); 
 
                    // ((ICollection)instance).Add((CollectionType)value);
                    if (!(bool)this.containsMethod.Invoke(instance, new object[] { value })) 
                    {
                        this.addMethod.Invoke(instance, new object[] { value });
                    }
                } 
                else if (null != this.propertySetter)
                { 
                    Debug.Assert((null == value) || this.PropertyType.IsAssignableFrom(value.GetType()), "unexpected property value to set"); 

                    // ((ElementType)instance).PropertyName = (PropertyType)value; 
                    this.propertySetter.Invoke(instance, new object[] { value });
                }
                else
                { 
                    throw Error.InvalidOperation(Strings.ClientType_MissingProperty(value.GetType().ToString(), propertyName));
                } 
            } 
        }
 
        /// equality comparer for TypeName
        private sealed class TypeNameEqualityComparer : IEqualityComparer
        {
            /// equality comparer for TypeName 
            /// left type
            /// right type 
            /// true if x and y are equal 
            public bool Equals(TypeName x, TypeName y)
            { 
                return (x.Type == y.Type && x.Name == y.Name);
            }

            /// compute hashcode for TypeName 
            /// object to compute hashcode for
            /// computed hashcode 
            public int GetHashCode(TypeName obj) 
            {
                return obj.Type.GetHashCode() ^ obj.Name.GetHashCode(); 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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