JsonFormatWriterGenerator.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Serialization / System / Runtime / Serialization / Json / JsonFormatWriterGenerator.cs / 1305376 / JsonFormatWriterGenerator.cs

                            namespace System.Runtime.Serialization.Json
{
    using System;
    using System.Collections; 
    using System.Reflection;
    using System.Reflection.Emit; 
    using System.Security; 
    using System.Security.Permissions;
    using System.Xml; 

    delegate void JsonFormatClassWriterDelegate(XmlWriterDelegator xmlWriter, object obj, XmlObjectSerializerWriteContextComplexJson context, ClassDataContract dataContract, XmlDictionaryString[] memberNames);
    delegate void JsonFormatCollectionWriterDelegate(XmlWriterDelegator xmlWriter, object obj, XmlObjectSerializerWriteContextComplexJson context, CollectionDataContract dataContract);
 
    class JsonFormatWriterGenerator
    { 
        [Fx.Tag.SecurityNote(Critical = "Holds instance of CriticalHelper which keeps state that was produced within an assert.")] 
        [SecurityCritical]
        CriticalHelper helper; 

        [Fx.Tag.SecurityNote(Critical = "Initializes SecurityCritical field 'helper'.")]
        [SecurityCritical]
        public JsonFormatWriterGenerator() 
        {
            helper = new CriticalHelper(); 
        } 

        [Fx.Tag.SecurityNote(Critical = "Accesses SecurityCritical helper class 'CriticalHelper'.")] 
        [SecurityCritical]
        internal JsonFormatClassWriterDelegate GenerateClassWriter(ClassDataContract classContract)
        {
            return helper.GenerateClassWriter(classContract); 
        }
 
        [Fx.Tag.SecurityNote(Critical = "Accesses SecurityCritical helper class 'CriticalHelper'.")] 
        [SecurityCritical]
        internal JsonFormatCollectionWriterDelegate GenerateCollectionWriter(CollectionDataContract collectionContract) 
        {
            return helper.GenerateCollectionWriter(collectionContract);
        }
 
        [Fx.Tag.SecurityNote(Miscellaneous = "RequiresReview - handles all aspects of IL generation including initializing the DynamicMethod."
            + "Changes to how IL generated could affect how data is deserialized and what gets access to data, " 
            + "therefore we mark it for review so that changes to generation logic are reviewed.")] 
        class CriticalHelper
        { 
            CodeGenerator ilg;
            ArgBuilder xmlWriterArg;
            ArgBuilder contextArg;
            ArgBuilder dataContractArg; 
            LocalBuilder objectLocal;
 
            // Used for classes 
            ArgBuilder memberNamesArg;
            int typeIndex = 1; 
            int childElementIndex = 0;

            internal JsonFormatClassWriterDelegate GenerateClassWriter(ClassDataContract classContract)
            { 
                ilg = new CodeGenerator();
                bool memberAccessFlag = classContract.RequiresMemberAccessForWrite(null); 
                try 
                {
                    BeginMethod(ilg, "Write" + classContract.StableName.Name + "ToJson", typeof(JsonFormatClassWriterDelegate), memberAccessFlag); 
                }
                catch (SecurityException securityException)
                {
                    if (memberAccessFlag && securityException.PermissionType.Equals(typeof(ReflectionPermission))) 
                    {
                        classContract.RequiresMemberAccessForWrite(securityException); 
                    } 
                    else
                    { 
                        throw;
                    }
                }
                InitArgs(classContract.UnderlyingType); 
                memberNamesArg = ilg.GetArg(4);
                DemandSerializationFormatterPermission(classContract); 
                DemandMemberAccessPermission(memberAccessFlag); 
                WriteClass(classContract);
                return (JsonFormatClassWriterDelegate)ilg.EndMethod(); 
            }

            internal JsonFormatCollectionWriterDelegate GenerateCollectionWriter(CollectionDataContract collectionContract)
            { 
                ilg = new CodeGenerator();
                bool memberAccessFlag = collectionContract.RequiresMemberAccessForWrite(null); 
                try 
                {
                    BeginMethod(ilg, "Write" + collectionContract.StableName.Name + "ToJson", typeof(JsonFormatCollectionWriterDelegate), memberAccessFlag); 
                }
                catch (SecurityException securityException)
                {
                    if (memberAccessFlag && securityException.PermissionType.Equals(typeof(ReflectionPermission))) 
                    {
                        collectionContract.RequiresMemberAccessForWrite(securityException); 
                    } 
                    else
                    { 
                        throw;
                    }
                }
                InitArgs(collectionContract.UnderlyingType); 
                DemandMemberAccessPermission(memberAccessFlag);
                WriteCollection(collectionContract); 
                return (JsonFormatCollectionWriterDelegate)ilg.EndMethod(); 
            }
 
            void BeginMethod(CodeGenerator ilg, string methodName, Type delegateType, bool allowPrivateMemberAccess)
            {
#if USE_REFEMIT
                ilg.BeginMethod(methodName, delegateType, allowPrivateMemberAccess); 
#else
                MethodInfo signature = delegateType.GetMethod("Invoke"); 
                ParameterInfo[] parameters = signature.GetParameters(); 
                Type[] paramTypes = new Type[parameters.Length];
                for (int i = 0; i < parameters.Length; i++) 
                    paramTypes[i] = parameters[i].ParameterType;

                DynamicMethod dynamicMethod = new DynamicMethod(methodName, signature.ReturnType, paramTypes, typeof(JsonFormatWriterGenerator).Module, allowPrivateMemberAccess);
                ilg.BeginMethod(dynamicMethod, delegateType, methodName, paramTypes, allowPrivateMemberAccess); 
#endif
            } 
 
            void InitArgs(Type objType)
            { 
                xmlWriterArg = ilg.GetArg(0);
                contextArg = ilg.GetArg(2);
                dataContractArg = ilg.GetArg(3);
 
                objectLocal = ilg.DeclareLocal(objType, "objSerialized");
                ArgBuilder objectArg = ilg.GetArg(1); 
                ilg.Load(objectArg); 

                // Copy the data from the DataTimeOffset object passed in to the DateTimeOffsetAdapter. 
                // DateTimeOffsetAdapter is used here for serialization purposes to bypass the ISerializable implementation
                // on DateTimeOffset; which does not work in partial trust.

                if (objType == Globals.TypeOfDateTimeOffsetAdapter) 
                {
                    ilg.ConvertValue(objectArg.ArgType, Globals.TypeOfDateTimeOffset); 
                    ilg.Call(XmlFormatGeneratorStatics.GetDateTimeOffsetAdapterMethod); 
                }
                else 
                {
                    ilg.ConvertValue(objectArg.ArgType, objType);
                }
                ilg.Stloc(objectLocal); 
            }
 
 
            void DemandMemberAccessPermission(bool memberAccessFlag)
            { 
                if (memberAccessFlag)
                {
                    ilg.Call(contextArg, XmlFormatGeneratorStatics.DemandMemberAccessPermissionMethod);
                } 
            }
 
            void DemandSerializationFormatterPermission(ClassDataContract classContract) 
            {
                if (!classContract.HasDataContract && !classContract.IsNonAttributedType) 
                {
                    ilg.Call(contextArg, XmlFormatGeneratorStatics.DemandSerializationFormatterPermissionMethod);
                }
            } 

            void InvokeOnSerializing(ClassDataContract classContract) 
            { 
                if (classContract.BaseContract != null)
                    InvokeOnSerializing(classContract.BaseContract); 
                if (classContract.OnSerializing != null)
                {
                    ilg.LoadAddress(objectLocal);
                    ilg.Load(contextArg); 
                    ilg.Call(XmlFormatGeneratorStatics.GetStreamingContextMethod);
                    ilg.Call(classContract.OnSerializing); 
                } 
            }
 
            void InvokeOnSerialized(ClassDataContract classContract)
            {
                if (classContract.BaseContract != null)
                    InvokeOnSerialized(classContract.BaseContract); 
                if (classContract.OnSerialized != null)
                { 
                    ilg.LoadAddress(objectLocal); 
                    ilg.Load(contextArg);
                    ilg.Call(XmlFormatGeneratorStatics.GetStreamingContextMethod); 
                    ilg.Call(classContract.OnSerialized);
                }
            }
 
            void WriteClass(ClassDataContract classContract)
            { 
                InvokeOnSerializing(classContract); 

                if (classContract.IsISerializable) 
                {
                    ilg.Call(contextArg, JsonFormatGeneratorStatics.WriteJsonISerializableMethod, xmlWriterArg, objectLocal);
                }
                else 
                {
                    if (classContract.HasExtensionData) 
                    { 
                        LocalBuilder extensionDataLocal = ilg.DeclareLocal(Globals.TypeOfExtensionDataObject, "extensionData");
                        ilg.Load(objectLocal); 
                        ilg.ConvertValue(objectLocal.LocalType, Globals.TypeOfIExtensibleDataObject);
                        ilg.LoadMember(JsonFormatGeneratorStatics.ExtensionDataProperty);
                        ilg.Store(extensionDataLocal);
                        ilg.Call(contextArg, XmlFormatGeneratorStatics.WriteExtensionDataMethod, xmlWriterArg, extensionDataLocal, -1); 
                        WriteMembers(classContract, extensionDataLocal, classContract);
                    } 
                    else 
                        WriteMembers(classContract, null, classContract);
                } 
                InvokeOnSerialized(classContract);
            }

            int WriteMembers(ClassDataContract classContract, LocalBuilder extensionDataLocal, ClassDataContract derivedMostClassContract) 
            {
                int memberCount = (classContract.BaseContract == null) ? 0 : 
                    WriteMembers(classContract.BaseContract, extensionDataLocal, derivedMostClassContract); 

                ilg.Call(contextArg, XmlFormatGeneratorStatics.IncrementItemCountMethod, classContract.Members.Count); 

                for (int i = 0; i < classContract.Members.Count; i++, memberCount++)
                {
                    DataMember member = classContract.Members[i]; 
                    Type memberType = member.MemberType;
                    LocalBuilder memberValue = null; 
                    if (member.IsGetOnlyCollection) 
                    {
                        ilg.Load(contextArg); 
                        ilg.Call(XmlFormatGeneratorStatics.StoreIsGetOnlyCollectionMethod);
                    }
                    if (!member.EmitDefaultValue)
                    { 
                        memberValue = LoadMemberValue(member);
                        ilg.IfNotDefaultValue(memberValue); 
                    } 

                    bool requiresNameAttribute = DataContractJsonSerializer.CheckIfXmlNameRequiresMapping(classContract.MemberNames[i]); 
                    if (requiresNameAttribute || !TryWritePrimitive(memberType, memberValue, member.MemberInfo, null /*arrayItemIndex*/, null /*nameLocal*/, i + childElementIndex))
                    {
                        // Note: DataContractSerializer has member-conflict logic here to deal with the schema export
                        //       requirement that the same member can't be of two different types. 
                        if (requiresNameAttribute)
                        { 
                            ilg.Call(null, JsonFormatGeneratorStatics.WriteJsonNameWithMappingMethod, xmlWriterArg, memberNamesArg, i + childElementIndex); 
                        }
                        else 
                        {
                            WriteStartElement(null /*nameLocal*/, i + childElementIndex);
                        }
                        if (memberValue == null) 
                            memberValue = LoadMemberValue(member);
                        WriteValue(memberValue); 
                        WriteEndElement(); 
                    }
                    if (classContract.HasExtensionData) 
                        ilg.Call(contextArg, XmlFormatGeneratorStatics.WriteExtensionDataMethod, xmlWriterArg, extensionDataLocal, memberCount);
                    if (!member.EmitDefaultValue)
                    {
                        if (member.IsRequired) 
                        {
                            ilg.Else(); 
                            ilg.Call(null, XmlFormatGeneratorStatics.ThrowRequiredMemberMustBeEmittedMethod, member.Name, classContract.UnderlyingType); 
                        }
                        ilg.EndIf(); 
                    }
                }

                typeIndex++; 
                childElementIndex += classContract.Members.Count;
                return memberCount; 
            } 

            private LocalBuilder LoadMemberValue(DataMember member) 
            {
                ilg.LoadAddress(objectLocal);
                ilg.LoadMember(member.MemberInfo);
                LocalBuilder memberValue = ilg.DeclareLocal(member.MemberType, member.Name + "Value"); 
                ilg.Stloc(memberValue);
                return memberValue; 
            } 

            void WriteCollection(CollectionDataContract collectionContract) 
            {
                LocalBuilder itemName = ilg.DeclareLocal(typeof(XmlDictionaryString), "itemName");
                ilg.Load(contextArg);
                ilg.LoadMember(JsonFormatGeneratorStatics.CollectionItemNameProperty); 
                ilg.Store(itemName);
 
                if (collectionContract.Kind == CollectionKind.Array) 
                {
                    Type itemType = collectionContract.ItemType; 
                    LocalBuilder i = ilg.DeclareLocal(Globals.TypeOfInt, "i");

                    ilg.Call(contextArg, XmlFormatGeneratorStatics.IncrementArrayCountMethod, xmlWriterArg, objectLocal);
 
                    if (!TryWritePrimitiveArray(collectionContract.UnderlyingType, itemType, objectLocal, itemName))
                    { 
                        WriteArrayAttribute(); 
                        ilg.For(i, 0, objectLocal);
                        if (!TryWritePrimitive(itemType, null /*value*/, null /*memberInfo*/, i /*arrayItemIndex*/, itemName, 0 /*nameIndex*/)) 
                        {
                            WriteStartElement(itemName, 0 /*nameIndex*/);
                            ilg.LoadArrayElement(objectLocal, i);
                            LocalBuilder memberValue = ilg.DeclareLocal(itemType, "memberValue"); 
                            ilg.Stloc(memberValue);
                            WriteValue(memberValue); 
                            WriteEndElement(); 
                        }
                        ilg.EndFor(); 
                    }
                }
                else
                { 
                    MethodInfo incrementCollectionCountMethod = null;
                    switch (collectionContract.Kind) 
                    { 
                        case CollectionKind.Collection:
                        case CollectionKind.List: 
                        case CollectionKind.Dictionary:
                            incrementCollectionCountMethod = XmlFormatGeneratorStatics.IncrementCollectionCountMethod;
                            break;
                        case CollectionKind.GenericCollection: 
                        case CollectionKind.GenericList:
                            incrementCollectionCountMethod = XmlFormatGeneratorStatics.IncrementCollectionCountGenericMethod.MakeGenericMethod(collectionContract.ItemType); 
                            break; 
                        case CollectionKind.GenericDictionary:
                            incrementCollectionCountMethod = XmlFormatGeneratorStatics.IncrementCollectionCountGenericMethod.MakeGenericMethod(Globals.TypeOfKeyValuePair.MakeGenericType(collectionContract.ItemType.GetGenericArguments())); 
                            break;
                    }
                    if (incrementCollectionCountMethod != null)
                    { 
                        ilg.Call(contextArg, incrementCollectionCountMethod, xmlWriterArg, objectLocal);
                    } 
 
                    bool isDictionary = false, isGenericDictionary = false;
                    Type enumeratorType = null; 
                    Type[] keyValueTypes = null;
                    if (collectionContract.Kind == CollectionKind.GenericDictionary)
                    {
                        isGenericDictionary = true; 
                        keyValueTypes = collectionContract.ItemType.GetGenericArguments();
                        enumeratorType = Globals.TypeOfGenericDictionaryEnumerator.MakeGenericType(keyValueTypes); 
                    } 
                    else if (collectionContract.Kind == CollectionKind.Dictionary)
                    { 
                        isDictionary = true;
                        keyValueTypes = new Type[] { Globals.TypeOfObject, Globals.TypeOfObject };
                        enumeratorType = Globals.TypeOfDictionaryEnumerator;
                    } 
                    else
                    { 
                        enumeratorType = collectionContract.GetEnumeratorMethod.ReturnType; 
                    }
                    MethodInfo moveNextMethod = enumeratorType.GetMethod(Globals.MoveNextMethodName, BindingFlags.Instance | BindingFlags.Public, null, Globals.EmptyTypeArray, null); 
                    MethodInfo getCurrentMethod = enumeratorType.GetMethod(Globals.GetCurrentMethodName, BindingFlags.Instance | BindingFlags.Public, null, Globals.EmptyTypeArray, null);
                    if (moveNextMethod == null || getCurrentMethod == null)
                    {
                        if (enumeratorType.IsInterface) 
                        {
                            if (moveNextMethod == null) 
                                moveNextMethod = JsonFormatGeneratorStatics.MoveNextMethod; 
                            if (getCurrentMethod == null)
                                getCurrentMethod = JsonFormatGeneratorStatics.GetCurrentMethod; 
                        }
                        else
                        {
                            Type ienumeratorInterface = Globals.TypeOfIEnumerator; 
                            CollectionKind kind = collectionContract.Kind;
                            if (kind == CollectionKind.GenericDictionary || kind == CollectionKind.GenericCollection || kind == CollectionKind.GenericEnumerable) 
                            { 
                                Type[] interfaceTypes = enumeratorType.GetInterfaces();
                                foreach (Type interfaceType in interfaceTypes) 
                                {
                                    if (interfaceType.IsGenericType
                                        && interfaceType.GetGenericTypeDefinition() == Globals.TypeOfIEnumeratorGeneric
                                        && interfaceType.GetGenericArguments()[0] == collectionContract.ItemType) 
                                    {
                                        ienumeratorInterface = interfaceType; 
                                        break; 
                                    }
                                } 
                            }
                            if (moveNextMethod == null)
                                moveNextMethod = CollectionDataContract.GetTargetMethodWithName(Globals.MoveNextMethodName, enumeratorType, ienumeratorInterface);
                            if (getCurrentMethod == null) 
                                getCurrentMethod = CollectionDataContract.GetTargetMethodWithName(Globals.GetCurrentMethodName, enumeratorType, ienumeratorInterface);
                        } 
                    } 
                    Type elementType = getCurrentMethod.ReturnType;
                    LocalBuilder currentValue = ilg.DeclareLocal(elementType, "currentValue"); 

                    LocalBuilder enumerator = ilg.DeclareLocal(enumeratorType, "enumerator");
                    ilg.Call(objectLocal, collectionContract.GetEnumeratorMethod);
                    if (isDictionary) 
                    {
                        ConstructorInfo dictEnumCtor = enumeratorType.GetConstructor(Globals.ScanAllMembers, null, new Type[] { Globals.TypeOfIDictionaryEnumerator }, null); 
                        ilg.ConvertValue(collectionContract.GetEnumeratorMethod.ReturnType, Globals.TypeOfIDictionaryEnumerator); 
                        ilg.New(dictEnumCtor);
                    } 
                    else if (isGenericDictionary)
                    {
                        Type ctorParam = Globals.TypeOfIEnumeratorGeneric.MakeGenericType(Globals.TypeOfKeyValuePair.MakeGenericType(keyValueTypes));
                        ConstructorInfo dictEnumCtor = enumeratorType.GetConstructor(Globals.ScanAllMembers, null, new Type[] { ctorParam }, null); 
                        ilg.ConvertValue(collectionContract.GetEnumeratorMethod.ReturnType, ctorParam);
                        ilg.New(dictEnumCtor); 
                    } 
                    ilg.Stloc(enumerator);
 
                    WriteArrayAttribute();

                    ilg.ForEach(currentValue, elementType, enumeratorType, enumerator, getCurrentMethod);
                    if (incrementCollectionCountMethod == null) 
                    {
                        ilg.Call(contextArg, XmlFormatGeneratorStatics.IncrementItemCountMethod, 1); 
                    } 
                    if (!TryWritePrimitive(elementType, currentValue, null /*memberInfo*/, null /*arrayItemIndex*/, itemName, 0 /*nameIndex*/))
                    { 
                        WriteStartElement(itemName, 0 /*nameIndex*/);

                        if (isGenericDictionary || isDictionary)
                        { 
                            ilg.Call(dataContractArg, JsonFormatGeneratorStatics.GetItemContractMethod);
                            ilg.Call(JsonFormatGeneratorStatics.GetRevisedItemContractMethod); 
                            ilg.Call(JsonFormatGeneratorStatics.GetJsonDataContractMethod); 
                            ilg.Load(xmlWriterArg);
                            ilg.Load(currentValue); 
                            ilg.ConvertValue(currentValue.LocalType, Globals.TypeOfObject);
                            ilg.Load(contextArg);
                            ilg.Load(currentValue.LocalType);
                            ilg.LoadMember(JsonFormatGeneratorStatics.TypeHandleProperty); 
                            ilg.Call(JsonFormatGeneratorStatics.WriteJsonValueMethod);
                        } 
                        else 
                        {
                            WriteValue(currentValue); 
                        }
                        WriteEndElement();
                    }
                    ilg.EndForEach(moveNextMethod); 
                }
            } 
 
            bool TryWritePrimitive(Type type, LocalBuilder value, MemberInfo memberInfo, LocalBuilder arrayItemIndex, LocalBuilder name, int nameIndex)
            { 
                PrimitiveDataContract primitiveContract = PrimitiveDataContract.GetPrimitiveDataContract(type);
                if (primitiveContract == null || primitiveContract.UnderlyingType == Globals.TypeOfObject)
                    return false;
 
                // load writer
                if (type.IsValueType) 
                { 
                    ilg.Load(xmlWriterArg);
                } 
                else
                {
                    ilg.Load(contextArg);
                    ilg.Load(xmlWriterArg); 
                }
                // load primitive value 
                if (value != null) 
                {
                    ilg.Load(value); 
                }
                else if (memberInfo != null)
                {
                    ilg.LoadAddress(objectLocal); 
                    ilg.LoadMember(memberInfo);
                } 
                else 
                {
                    ilg.LoadArrayElement(objectLocal, arrayItemIndex); 
                }
                // load name
                if (name != null)
                { 
                    ilg.Load(name);
                } 
                else 
                {
                    ilg.LoadArrayElement(memberNamesArg, nameIndex); 
                }
                // load namespace
                ilg.Load(null);
                // call method to write primitive 
                ilg.Call(primitiveContract.XmlFormatWriterMethod);
                return true; 
            } 

            bool TryWritePrimitiveArray(Type type, Type itemType, LocalBuilder value, LocalBuilder itemName) 
            {
                PrimitiveDataContract primitiveContract = PrimitiveDataContract.GetPrimitiveDataContract(itemType);
                if (primitiveContract == null)
                    return false; 

                string writeArrayMethod = null; 
                switch (Type.GetTypeCode(itemType)) 
                {
                    case TypeCode.Boolean: 
                        writeArrayMethod = "WriteJsonBooleanArray";
                        break;
                    case TypeCode.DateTime:
                        writeArrayMethod = "WriteJsonDateTimeArray"; 
                        break;
                    case TypeCode.Decimal: 
                        writeArrayMethod = "WriteJsonDecimalArray"; 
                        break;
                    case TypeCode.Int32: 
                        writeArrayMethod = "WriteJsonInt32Array";
                        break;
                    case TypeCode.Int64:
                        writeArrayMethod = "WriteJsonInt64Array"; 
                        break;
                    case TypeCode.Single: 
                        writeArrayMethod = "WriteJsonSingleArray"; 
                        break;
                    case TypeCode.Double: 
                        writeArrayMethod = "WriteJsonDoubleArray";
                        break;
                    default:
                        break; 
                }
                if (writeArrayMethod != null) 
                { 
                    WriteArrayAttribute();
                    ilg.Call(xmlWriterArg, typeof(JsonWriterDelegator).GetMethod(writeArrayMethod, Globals.ScanAllMembers, null, new Type[] { type, typeof(XmlDictionaryString), typeof(XmlDictionaryString) }, null), value, itemName, null); 
                    return true;
                }
                return false;
            } 

            void WriteArrayAttribute() 
            { 
                ilg.Call(xmlWriterArg, JsonFormatGeneratorStatics.WriteAttributeStringMethod,
                    null /* prefix */, 
                    JsonGlobals.typeString /* local name */,
                    string.Empty /* namespace */,
                    JsonGlobals.arrayString /* value */);
            } 

            void WriteValue(LocalBuilder memberValue) 
            { 
                Type memberType = memberValue.LocalType;
                if (memberType.IsPointer) 
                {
                    ilg.Load(memberValue);
                    ilg.Load(memberType);
                    ilg.Call(JsonFormatGeneratorStatics.BoxPointer); 
                    memberType = Globals.TypeOfReflectionPointer;
                    memberValue = ilg.DeclareLocal(memberType, "memberValueRefPointer"); 
                    ilg.Store(memberValue); 
                }
                bool isNullableOfT = (memberType.IsGenericType && 
                                      memberType.GetGenericTypeDefinition() == Globals.TypeOfNullable);
                if (memberType.IsValueType && !isNullableOfT)
                {
                    PrimitiveDataContract primitiveContract = PrimitiveDataContract.GetPrimitiveDataContract(memberType); 
                    if (primitiveContract != null)
                        ilg.Call(xmlWriterArg, primitiveContract.XmlFormatContentWriterMethod, memberValue); 
                    else 
                        InternalSerialize(XmlFormatGeneratorStatics.InternalSerializeMethod, memberValue, memberType, false /* writeXsiType */);
                } 
                else
                {
                    if (isNullableOfT)
                    { 
                        memberValue = UnwrapNullableObject(memberValue);//Leaves !HasValue on stack
                        memberType = memberValue.LocalType; 
                    } 
                    else
                    { 
                        ilg.Load(memberValue);
                        ilg.Load(null);
                        ilg.Ceq();
                    } 
                    ilg.If();
                    ilg.Call(contextArg, XmlFormatGeneratorStatics.WriteNullMethod, xmlWriterArg, memberType, DataContract.IsTypeSerializable(memberType)); 
                    ilg.Else(); 
                    PrimitiveDataContract primitiveContract = PrimitiveDataContract.GetPrimitiveDataContract(memberType);
                    if (primitiveContract != null && primitiveContract.UnderlyingType != Globals.TypeOfObject) 
                    {
                        if (isNullableOfT)
                        {
                            ilg.Call(xmlWriterArg, primitiveContract.XmlFormatContentWriterMethod, memberValue); 
                        }
                        else 
                        { 
                            ilg.Call(contextArg, primitiveContract.XmlFormatContentWriterMethod, xmlWriterArg, memberValue);
                        } 
                    }
                    else
                    {
                        if (memberType == Globals.TypeOfObject ||//boxed Nullable 
                            memberType == Globals.TypeOfValueType ||
                            ((IList)Globals.TypeOfNullable.GetInterfaces()).Contains(memberType)) 
                        { 
                            ilg.Load(memberValue);
                            ilg.ConvertValue(memberValue.LocalType, Globals.TypeOfObject); 
                            memberValue = ilg.DeclareLocal(Globals.TypeOfObject, "unwrappedMemberValue");
                            memberType = memberValue.LocalType;
                            ilg.Stloc(memberValue);
                            ilg.If(memberValue, Cmp.EqualTo, null); 
                            ilg.Call(contextArg, XmlFormatGeneratorStatics.WriteNullMethod, xmlWriterArg, memberType, DataContract.IsTypeSerializable(memberType));
                            ilg.Else(); 
                        } 
                        InternalSerialize((isNullableOfT ? XmlFormatGeneratorStatics.InternalSerializeMethod : XmlFormatGeneratorStatics.InternalSerializeReferenceMethod),
                            memberValue, memberType, false /* writeXsiType */); 

                        if (memberType == Globals.TypeOfObject) //boxed Nullable
                            ilg.EndIf();
                    } 
                    ilg.EndIf();
                } 
            } 

            void InternalSerialize(MethodInfo methodInfo, LocalBuilder memberValue, Type memberType, bool writeXsiType) 
            {
                ilg.Load(contextArg);
                ilg.Load(xmlWriterArg);
                ilg.Load(memberValue); 
                ilg.ConvertValue(memberValue.LocalType, Globals.TypeOfObject);
                LocalBuilder typeHandleValue = ilg.DeclareLocal(typeof(RuntimeTypeHandle), "typeHandleValue"); 
                ilg.Call(null, typeof(Type).GetMethod("GetTypeHandle"), memberValue); 
                ilg.Stloc(typeHandleValue);
                ilg.LoadAddress(typeHandleValue); 
                ilg.Ldtoken(memberType);
                ilg.Call(typeof(RuntimeTypeHandle).GetMethod("Equals", new Type[] { typeof(RuntimeTypeHandle) }));
                ilg.Load(writeXsiType);
                ilg.Load(DataContract.GetId(memberType.TypeHandle)); 
                ilg.Ldtoken(memberType);
                ilg.Call(methodInfo); 
            } 

            LocalBuilder UnwrapNullableObject(LocalBuilder memberValue)// Leaves !HasValue on stack 
            {
                Type memberType = memberValue.LocalType;
                Label onNull = ilg.DefineLabel();
                Label end = ilg.DefineLabel(); 
                ilg.Load(memberValue);
                while (memberType.IsGenericType && memberType.GetGenericTypeDefinition() == Globals.TypeOfNullable) 
                { 
                    Type innerType = memberType.GetGenericArguments()[0];
                    ilg.Dup(); 
                    ilg.Call(XmlFormatGeneratorStatics.GetHasValueMethod.MakeGenericMethod(innerType));
                    ilg.Brfalse(onNull);
                    ilg.Call(XmlFormatGeneratorStatics.GetNullableValueMethod.MakeGenericMethod(innerType));
                    memberType = innerType; 
                }
                memberValue = ilg.DeclareLocal(memberType, "nullableUnwrappedMemberValue"); 
                ilg.Stloc(memberValue); 
                ilg.Load(false); //isNull
                ilg.Br(end); 
                ilg.MarkLabel(onNull);
                ilg.Pop();
                ilg.Call(XmlFormatGeneratorStatics.GetDefaultValueMethod.MakeGenericMethod(memberType));
                ilg.Stloc(memberValue); 
                ilg.Load(true);//isNull
                ilg.MarkLabel(end); 
                return memberValue; 
            }
 
            void WriteStartElement(LocalBuilder nameLocal, int nameIndex)
            {
                ilg.Load(xmlWriterArg);
 
                // localName
                if (nameLocal == null) 
                    ilg.LoadArrayElement(memberNamesArg, nameIndex); 
                else
                    ilg.Load(nameLocal); 

                // namespace
                ilg.Load(null);
 
                ilg.Call(JsonFormatGeneratorStatics.WriteStartElementMethod);
            } 
 
            void WriteEndElement()
            { 
                ilg.Call(xmlWriterArg, JsonFormatGeneratorStatics.WriteEndElementMethod);
            }
        }
    } 
}

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

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