XmlDataContract.cs source code in C# .NET

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Code:

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

                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Runtime.Serialization
{ 
    using System;
    using System.Collections.Generic; 
    using System.Reflection; 
    using System.Security;
    using System.Security.Permissions; 
    using System.Threading;
    using System.Xml;
    using System.Xml.Schema;
    using System.Xml.Serialization; 
    using DataContractDictionary = System.Collections.Generic.Dictionary;
 
    internal delegate IXmlSerializable CreateXmlSerializableDelegate(); 
#if USE_REFEMIT
    public sealed class XmlDataContract : DataContract 
#else
    internal sealed class XmlDataContract : DataContract
#endif
    { 
        [Fx.Tag.SecurityNote(Critical = "Holds instance of CriticalHelper which keeps state that is cached statically for serialization."
            + " Static fields are marked SecurityCritical or readonly to prevent data from being modified or leaked to other components in appdomain.")] 
        [SecurityCritical] 
        XmlDataContractCriticalHelper helper;
 
        [Fx.Tag.SecurityNote(Critical = "Initializes SecurityCritical field 'helper'.",
            Safe = "Doesn't leak anything.")]
        [SecuritySafeCritical]
        internal XmlDataContract() : base(new XmlDataContractCriticalHelper()) 
        {
            helper = base.Helper as XmlDataContractCriticalHelper; 
        } 

        [Fx.Tag.SecurityNote(Critical = "Initializes SecurityCritical field 'helper'.", 
            Safe = "Doesn't leak anything.")]
        [SecuritySafeCritical]
        internal XmlDataContract(Type type) : base(new XmlDataContractCriticalHelper(type))
        { 
            helper = base.Helper as XmlDataContractCriticalHelper;
        } 
 
        internal override DataContractDictionary KnownDataContracts
        { 
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical KnownDataContracts property.",
                Safe = "KnownDataContracts only needs to be protected for write.")]
            [SecuritySafeCritical]
            get { return helper.KnownDataContracts; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical KnownDataContracts property.")] 
            [SecurityCritical] 
            set { helper.KnownDataContracts = value; }
        } 

        internal XmlSchemaType XsdType
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical XsdType property.", 
                Safe = "XsdType only needs to be protected for write.")]
            [SecuritySafeCritical] 
            get { return helper.XsdType; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical XsdType property.")] 
            [SecurityCritical]
            set { helper.XsdType = value; }
        }
 
        internal bool IsAnonymous
        { 
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical IsAnonymous property.", 
                Safe = "IsAnonymous only needs to be protected for write.")]
            [SecuritySafeCritical] 
            get { return helper.IsAnonymous; }
        }

        internal override bool HasRoot 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical HasRoot property.", 
                Safe = "HasRoot only needs to be protected for write.")] 
            [SecuritySafeCritical]
            get { return helper.HasRoot; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical HasRoot property.")]
            [SecurityCritical]
            set { helper.HasRoot = value; } 
        }
 
        internal override XmlDictionaryString TopLevelElementName 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical TopLevelElementName property.", 
                Safe = "TopLevelElementName only needs to be protected for write.")]
            [SecuritySafeCritical]
            get { return helper.TopLevelElementName; }
 
            [Fx.Tag.SecurityNote(Critical = "Sets the critical TopLevelElementName property.")]
            [SecurityCritical] 
            set { helper.TopLevelElementName = value; } 
        }
 
        internal override XmlDictionaryString TopLevelElementNamespace
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical TopLevelElementNamespace property.",
                Safe = "TopLevelElementNamespace only needs to be protected for write.")] 
            [SecuritySafeCritical]
            get { return helper.TopLevelElementNamespace; } 
 
            [Fx.Tag.SecurityNote(Critical = "Sets the critical TopLevelElementNamespace property.")]
            [SecurityCritical] 
            set { helper.TopLevelElementNamespace = value; }
        }

        internal bool IsTopLevelElementNullable 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical IsTopLevelElementNullable property.", 
                Safe = "IsTopLevelElementNullable only needs to be protected for write.")] 
            [SecuritySafeCritical]
            get { return helper.IsTopLevelElementNullable; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical IsTopLevelElementNullable property.")]
            [SecurityCritical]
            set { helper.IsTopLevelElementNullable = value; } 
        }
 
        internal bool IsTypeDefinedOnImport 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical IsTypeDefinedOnImport property.", 
                Safe = "IsTypeDefinedOnImport only needs to be protected for write.")]
            [SecuritySafeCritical]
            get { return helper.IsTypeDefinedOnImport; }
 
            [Fx.Tag.SecurityNote(Critical = "Sets the critical IsTypeDefinedOnImport property.")]
            [SecurityCritical] 
            set { helper.IsTypeDefinedOnImport = value; } 
        }
 
        internal CreateXmlSerializableDelegate CreateXmlSerializableDelegate
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical CreateXmlSerializableDelegate property.",
                Safe = "CreateXmlSerializableDelegate only needs to be protected for write; initialized in getter if null.")] 
            [SecuritySafeCritical]
            get 
            { 
                if (helper.CreateXmlSerializableDelegate == null)
                { 
                    lock (this)
                    {
                        if (helper.CreateXmlSerializableDelegate == null)
                        { 
                            CreateXmlSerializableDelegate tempCreateXmlSerializable = GenerateCreateXmlSerializableDelegate();
                            Thread.MemoryBarrier(); 
                            helper.CreateXmlSerializableDelegate = tempCreateXmlSerializable; 
                        }
                    } 
                }
                return helper.CreateXmlSerializableDelegate;
            }
        } 

        internal override bool CanContainReferences 
        { 
            get { return false; }
        } 

        internal override bool IsBuiltInDataContract
        {
            get 
            {
                return UnderlyingType == Globals.TypeOfXmlElement || UnderlyingType == Globals.TypeOfXmlNodeArray; 
            } 
        }
 
        [Fx.Tag.SecurityNote(Critical = "Holds all state used for for (de)serializing XML types."
            + " Since the data is cached statically, we lock down access to it.")]
        [SecurityCritical(SecurityCriticalScope.Everything)]
        class XmlDataContractCriticalHelper : DataContract.DataContractCriticalHelper 
        {
            DataContractDictionary knownDataContracts; 
            bool isKnownTypeAttributeChecked; 
            XmlDictionaryString topLevelElementName;
            XmlDictionaryString topLevelElementNamespace; 
            bool isTopLevelElementNullable;
            bool isTypeDefinedOnImport;
            XmlSchemaType xsdType;
            bool hasRoot; 
            CreateXmlSerializableDelegate createXmlSerializable;
 
            internal XmlDataContractCriticalHelper() 
            {
            } 

            internal XmlDataContractCriticalHelper(Type type) : base(type)
            {
                if (type.IsDefined(Globals.TypeOfDataContractAttribute, false)) 
                    throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableCannotHaveDataContract, DataContract.GetClrTypeFullName(type))));
                if (type.IsDefined(Globals.TypeOfCollectionDataContractAttribute, false)) 
                    throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableCannotHaveCollectionDataContract, DataContract.GetClrTypeFullName(type)))); 
                XmlSchemaType xsdType;
                bool hasRoot; 
                XmlQualifiedName stableName;
                SchemaExporter.GetXmlTypeInfo(type, out stableName, out xsdType, out hasRoot);
                this.StableName = stableName;
                this.XsdType = xsdType; 
                this.HasRoot = hasRoot;
                XmlDictionary dictionary = new XmlDictionary(); 
                this.Name = dictionary.Add(StableName.Name); 
                this.Namespace = dictionary.Add(StableName.Namespace);
                object[] xmlRootAttributes = (UnderlyingType == null) ? null : UnderlyingType.GetCustomAttributes(Globals.TypeOfXmlRootAttribute, false); 
                if (xmlRootAttributes == null || xmlRootAttributes.Length == 0)
                {
                    if (hasRoot)
                    { 
                        topLevelElementName = Name;
                        topLevelElementNamespace = (this.StableName.Namespace == Globals.SchemaNamespace) ? DictionaryGlobals.EmptyString : Namespace; 
                        isTopLevelElementNullable = true; 
                    }
                } 
                else
                {
                    if (hasRoot)
                    { 
                        XmlRootAttribute xmlRootAttribute = (XmlRootAttribute)xmlRootAttributes[0];
                        isTopLevelElementNullable = xmlRootAttribute.IsNullable; 
                        string elementName = xmlRootAttribute.ElementName; 
                        topLevelElementName = (elementName == null || elementName.Length == 0) ? Name : dictionary.Add(DataContract.EncodeLocalName(elementName));
                        string elementNs = xmlRootAttribute.Namespace; 
                        topLevelElementNamespace = (elementNs == null || elementNs.Length == 0) ? DictionaryGlobals.EmptyString : dictionary.Add(elementNs);
                    }
                    else
                    { 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IsAnyCannotHaveXmlRoot, DataContract.GetClrTypeFullName(UnderlyingType))));
                    } 
                } 
            }
 
            internal override DataContractDictionary KnownDataContracts
            {
                get
                { 
                    if (!isKnownTypeAttributeChecked && UnderlyingType != null)
                    { 
                        lock (this) 
                        {
                            if (!isKnownTypeAttributeChecked) 
                            {
                                knownDataContracts = DataContract.ImportKnownTypeAttributes(this.UnderlyingType);
                                Thread.MemoryBarrier();
                                isKnownTypeAttributeChecked = true; 
                            }
                        } 
                    } 
                    return knownDataContracts;
                } 
                set { knownDataContracts = value; }
            }

            internal XmlSchemaType XsdType 
            {
                get { return xsdType; } 
                set { xsdType = value; } 
            }
 
            internal bool IsAnonymous
            {
                get { return xsdType != null; }
            } 

            internal override bool HasRoot 
            { 
                get { return hasRoot; }
                set { hasRoot = value; } 
            }

            internal override XmlDictionaryString TopLevelElementName
            { 
                get { return topLevelElementName; }
                set { topLevelElementName = value; } 
            } 

            internal override XmlDictionaryString TopLevelElementNamespace 
            {
                get { return topLevelElementNamespace; }
                set { topLevelElementNamespace = value; }
            } 

            internal bool IsTopLevelElementNullable 
            { 
                get { return isTopLevelElementNullable; }
                set { isTopLevelElementNullable = value; } 
            }

            internal bool IsTypeDefinedOnImport
            { 
                get { return isTypeDefinedOnImport; }
                set { isTypeDefinedOnImport = value; } 
            } 

            internal CreateXmlSerializableDelegate CreateXmlSerializableDelegate 
            {
                get { return createXmlSerializable; }
                set { createXmlSerializable = value; }
            } 

        } 
 
        ConstructorInfo GetConstructor()
        { 
            Type type = UnderlyingType;

            if (type.IsValueType)
                return null; 

            ConstructorInfo ctor = type.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, null, Globals.EmptyTypeArray, null); 
            if (ctor == null) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableMustHaveDefaultConstructor, DataContract.GetClrTypeFullName(type))));
 
            return ctor;
        }

        [Fx.Tag.SecurityNote(Critical = "Sets critical properties on XmlDataContract.")] 
        [SecurityCritical]
        internal void SetTopLevelElementName(XmlQualifiedName elementName) 
        { 
            if (elementName != null)
            { 
                XmlDictionary dictionary = new XmlDictionary();
                this.TopLevelElementName = dictionary.Add(elementName.Name);
                this.TopLevelElementNamespace = dictionary.Add(elementName.Namespace);
            } 
        }
 
        [Fx.Tag.SecurityNote(Critical = "Calls CodeGenerator.BeginMethod which is SecurityCritical.", 
            Safe = "Self-contained: returns the delegate to the generated IL but otherwise all IL generation is self-contained here.")]
        [SecuritySafeCritical] 
        internal CreateXmlSerializableDelegate GenerateCreateXmlSerializableDelegate()
        {
            Type type = this.UnderlyingType;
            CodeGenerator ilg = new CodeGenerator(); 
            bool memberAccessFlag = RequiresMemberAccessForCreate(null);
            try 
            { 
                ilg.BeginMethod("Create" + DataContract.GetClrTypeFullName(type), typeof(CreateXmlSerializableDelegate), memberAccessFlag);
            } 
            catch (SecurityException securityException)
            {
                if (memberAccessFlag && securityException.PermissionType.Equals(typeof(ReflectionPermission)))
                { 
                    RequiresMemberAccessForCreate(securityException);
                } 
                else 
                {
                    throw; 
                }
            }
            if (type.IsValueType)
            { 
                System.Reflection.Emit.LocalBuilder local = ilg.DeclareLocal(type, type.Name + "Value");
                ilg.Ldloca(local); 
                ilg.InitObj(type); 
                ilg.Ldloc(local);
            } 
            else
            {
                ilg.New(GetConstructor());
            } 
            ilg.ConvertValue(this.UnderlyingType, Globals.TypeOfIXmlSerializable);
            ilg.Ret(); 
            return (CreateXmlSerializableDelegate)ilg.EndMethod(); 
        }
 
        [Fx.Tag.SecurityNote(Miscellaneous = "RequiresReview - Calculates whether this Xml type requires MemberAccessPermission for deserialization."
            + " Since this information is used to determine whether to give the generated code access"
            + " permissions to private members, any changes to the logic should be reviewed.")]
        bool RequiresMemberAccessForCreate(SecurityException securityException) 
        {
            if (!IsTypeVisible(UnderlyingType)) 
            { 
                if (securityException != null)
                { 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                        new SecurityException(SR.GetString(SR.PartialTrustIXmlSerializableTypeNotPublic, DataContract.GetClrTypeFullName(UnderlyingType)),
                        securityException));
                } 
                return true;
            } 
 
            if (ConstructorRequiresMemberAccess(GetConstructor()))
            { 
                if (securityException != null)
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                        new SecurityException(SR.GetString(SR.PartialTrustIXmlSerialzableNoPublicConstructor, DataContract.GetClrTypeFullName(UnderlyingType)), 
                        securityException));
                } 
                return true; 
            }
 
            return false;
        }

        internal override bool Equals(object other, Dictionary checkedContracts) 
        {
            if (IsEqualOrChecked(other, checkedContracts)) 
                return true; 

            XmlDataContract dataContract = other as XmlDataContract; 
            if (dataContract != null)
            {
                if (this.HasRoot != dataContract.HasRoot)
                    return false; 

                if (this.IsAnonymous) 
                { 
                    return dataContract.IsAnonymous;
                } 
                else
                {
                    return (StableName.Name == dataContract.StableName.Name && StableName.Namespace == dataContract.StableName.Namespace);
                } 
            }
            return false; 
        } 

        public override int GetHashCode() 
        {
            return base.GetHashCode();
        }
 
        public override void WriteXmlValue(XmlWriterDelegator xmlWriter, object obj, XmlObjectSerializerWriteContext context)
        { 
            if (context == null) 
                XmlObjectSerializerWriteContext.WriteRootIXmlSerializable(xmlWriter, obj);
            else 
                context.WriteIXmlSerializable(xmlWriter, obj);
        }

        public override object ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context) 
        {
            object o; 
            if (context == null) 
            {
                o = XmlObjectSerializerReadContext.ReadRootIXmlSerializable(xmlReader, this, true /*isMemberType*/); 
            }
            else
            {
                o = context.ReadIXmlSerializable(xmlReader, this, true /*isMemberType*/); 
                context.AddNewObject(o);
            } 
            xmlReader.ReadEndElement(); 
            return o;
        } 

    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Runtime.Serialization
{ 
    using System;
    using System.Collections.Generic; 
    using System.Reflection; 
    using System.Security;
    using System.Security.Permissions; 
    using System.Threading;
    using System.Xml;
    using System.Xml.Schema;
    using System.Xml.Serialization; 
    using DataContractDictionary = System.Collections.Generic.Dictionary;
 
    internal delegate IXmlSerializable CreateXmlSerializableDelegate(); 
#if USE_REFEMIT
    public sealed class XmlDataContract : DataContract 
#else
    internal sealed class XmlDataContract : DataContract
#endif
    { 
        [Fx.Tag.SecurityNote(Critical = "Holds instance of CriticalHelper which keeps state that is cached statically for serialization."
            + " Static fields are marked SecurityCritical or readonly to prevent data from being modified or leaked to other components in appdomain.")] 
        [SecurityCritical] 
        XmlDataContractCriticalHelper helper;
 
        [Fx.Tag.SecurityNote(Critical = "Initializes SecurityCritical field 'helper'.",
            Safe = "Doesn't leak anything.")]
        [SecuritySafeCritical]
        internal XmlDataContract() : base(new XmlDataContractCriticalHelper()) 
        {
            helper = base.Helper as XmlDataContractCriticalHelper; 
        } 

        [Fx.Tag.SecurityNote(Critical = "Initializes SecurityCritical field 'helper'.", 
            Safe = "Doesn't leak anything.")]
        [SecuritySafeCritical]
        internal XmlDataContract(Type type) : base(new XmlDataContractCriticalHelper(type))
        { 
            helper = base.Helper as XmlDataContractCriticalHelper;
        } 
 
        internal override DataContractDictionary KnownDataContracts
        { 
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical KnownDataContracts property.",
                Safe = "KnownDataContracts only needs to be protected for write.")]
            [SecuritySafeCritical]
            get { return helper.KnownDataContracts; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical KnownDataContracts property.")] 
            [SecurityCritical] 
            set { helper.KnownDataContracts = value; }
        } 

        internal XmlSchemaType XsdType
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical XsdType property.", 
                Safe = "XsdType only needs to be protected for write.")]
            [SecuritySafeCritical] 
            get { return helper.XsdType; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical XsdType property.")] 
            [SecurityCritical]
            set { helper.XsdType = value; }
        }
 
        internal bool IsAnonymous
        { 
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical IsAnonymous property.", 
                Safe = "IsAnonymous only needs to be protected for write.")]
            [SecuritySafeCritical] 
            get { return helper.IsAnonymous; }
        }

        internal override bool HasRoot 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical HasRoot property.", 
                Safe = "HasRoot only needs to be protected for write.")] 
            [SecuritySafeCritical]
            get { return helper.HasRoot; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical HasRoot property.")]
            [SecurityCritical]
            set { helper.HasRoot = value; } 
        }
 
        internal override XmlDictionaryString TopLevelElementName 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical TopLevelElementName property.", 
                Safe = "TopLevelElementName only needs to be protected for write.")]
            [SecuritySafeCritical]
            get { return helper.TopLevelElementName; }
 
            [Fx.Tag.SecurityNote(Critical = "Sets the critical TopLevelElementName property.")]
            [SecurityCritical] 
            set { helper.TopLevelElementName = value; } 
        }
 
        internal override XmlDictionaryString TopLevelElementNamespace
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical TopLevelElementNamespace property.",
                Safe = "TopLevelElementNamespace only needs to be protected for write.")] 
            [SecuritySafeCritical]
            get { return helper.TopLevelElementNamespace; } 
 
            [Fx.Tag.SecurityNote(Critical = "Sets the critical TopLevelElementNamespace property.")]
            [SecurityCritical] 
            set { helper.TopLevelElementNamespace = value; }
        }

        internal bool IsTopLevelElementNullable 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical IsTopLevelElementNullable property.", 
                Safe = "IsTopLevelElementNullable only needs to be protected for write.")] 
            [SecuritySafeCritical]
            get { return helper.IsTopLevelElementNullable; } 

            [Fx.Tag.SecurityNote(Critical = "Sets the critical IsTopLevelElementNullable property.")]
            [SecurityCritical]
            set { helper.IsTopLevelElementNullable = value; } 
        }
 
        internal bool IsTypeDefinedOnImport 
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical IsTypeDefinedOnImport property.", 
                Safe = "IsTypeDefinedOnImport only needs to be protected for write.")]
            [SecuritySafeCritical]
            get { return helper.IsTypeDefinedOnImport; }
 
            [Fx.Tag.SecurityNote(Critical = "Sets the critical IsTypeDefinedOnImport property.")]
            [SecurityCritical] 
            set { helper.IsTypeDefinedOnImport = value; } 
        }
 
        internal CreateXmlSerializableDelegate CreateXmlSerializableDelegate
        {
            [Fx.Tag.SecurityNote(Critical = "Fetches the critical CreateXmlSerializableDelegate property.",
                Safe = "CreateXmlSerializableDelegate only needs to be protected for write; initialized in getter if null.")] 
            [SecuritySafeCritical]
            get 
            { 
                if (helper.CreateXmlSerializableDelegate == null)
                { 
                    lock (this)
                    {
                        if (helper.CreateXmlSerializableDelegate == null)
                        { 
                            CreateXmlSerializableDelegate tempCreateXmlSerializable = GenerateCreateXmlSerializableDelegate();
                            Thread.MemoryBarrier(); 
                            helper.CreateXmlSerializableDelegate = tempCreateXmlSerializable; 
                        }
                    } 
                }
                return helper.CreateXmlSerializableDelegate;
            }
        } 

        internal override bool CanContainReferences 
        { 
            get { return false; }
        } 

        internal override bool IsBuiltInDataContract
        {
            get 
            {
                return UnderlyingType == Globals.TypeOfXmlElement || UnderlyingType == Globals.TypeOfXmlNodeArray; 
            } 
        }
 
        [Fx.Tag.SecurityNote(Critical = "Holds all state used for for (de)serializing XML types."
            + " Since the data is cached statically, we lock down access to it.")]
        [SecurityCritical(SecurityCriticalScope.Everything)]
        class XmlDataContractCriticalHelper : DataContract.DataContractCriticalHelper 
        {
            DataContractDictionary knownDataContracts; 
            bool isKnownTypeAttributeChecked; 
            XmlDictionaryString topLevelElementName;
            XmlDictionaryString topLevelElementNamespace; 
            bool isTopLevelElementNullable;
            bool isTypeDefinedOnImport;
            XmlSchemaType xsdType;
            bool hasRoot; 
            CreateXmlSerializableDelegate createXmlSerializable;
 
            internal XmlDataContractCriticalHelper() 
            {
            } 

            internal XmlDataContractCriticalHelper(Type type) : base(type)
            {
                if (type.IsDefined(Globals.TypeOfDataContractAttribute, false)) 
                    throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableCannotHaveDataContract, DataContract.GetClrTypeFullName(type))));
                if (type.IsDefined(Globals.TypeOfCollectionDataContractAttribute, false)) 
                    throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableCannotHaveCollectionDataContract, DataContract.GetClrTypeFullName(type)))); 
                XmlSchemaType xsdType;
                bool hasRoot; 
                XmlQualifiedName stableName;
                SchemaExporter.GetXmlTypeInfo(type, out stableName, out xsdType, out hasRoot);
                this.StableName = stableName;
                this.XsdType = xsdType; 
                this.HasRoot = hasRoot;
                XmlDictionary dictionary = new XmlDictionary(); 
                this.Name = dictionary.Add(StableName.Name); 
                this.Namespace = dictionary.Add(StableName.Namespace);
                object[] xmlRootAttributes = (UnderlyingType == null) ? null : UnderlyingType.GetCustomAttributes(Globals.TypeOfXmlRootAttribute, false); 
                if (xmlRootAttributes == null || xmlRootAttributes.Length == 0)
                {
                    if (hasRoot)
                    { 
                        topLevelElementName = Name;
                        topLevelElementNamespace = (this.StableName.Namespace == Globals.SchemaNamespace) ? DictionaryGlobals.EmptyString : Namespace; 
                        isTopLevelElementNullable = true; 
                    }
                } 
                else
                {
                    if (hasRoot)
                    { 
                        XmlRootAttribute xmlRootAttribute = (XmlRootAttribute)xmlRootAttributes[0];
                        isTopLevelElementNullable = xmlRootAttribute.IsNullable; 
                        string elementName = xmlRootAttribute.ElementName; 
                        topLevelElementName = (elementName == null || elementName.Length == 0) ? Name : dictionary.Add(DataContract.EncodeLocalName(elementName));
                        string elementNs = xmlRootAttribute.Namespace; 
                        topLevelElementNamespace = (elementNs == null || elementNs.Length == 0) ? DictionaryGlobals.EmptyString : dictionary.Add(elementNs);
                    }
                    else
                    { 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IsAnyCannotHaveXmlRoot, DataContract.GetClrTypeFullName(UnderlyingType))));
                    } 
                } 
            }
 
            internal override DataContractDictionary KnownDataContracts
            {
                get
                { 
                    if (!isKnownTypeAttributeChecked && UnderlyingType != null)
                    { 
                        lock (this) 
                        {
                            if (!isKnownTypeAttributeChecked) 
                            {
                                knownDataContracts = DataContract.ImportKnownTypeAttributes(this.UnderlyingType);
                                Thread.MemoryBarrier();
                                isKnownTypeAttributeChecked = true; 
                            }
                        } 
                    } 
                    return knownDataContracts;
                } 
                set { knownDataContracts = value; }
            }

            internal XmlSchemaType XsdType 
            {
                get { return xsdType; } 
                set { xsdType = value; } 
            }
 
            internal bool IsAnonymous
            {
                get { return xsdType != null; }
            } 

            internal override bool HasRoot 
            { 
                get { return hasRoot; }
                set { hasRoot = value; } 
            }

            internal override XmlDictionaryString TopLevelElementName
            { 
                get { return topLevelElementName; }
                set { topLevelElementName = value; } 
            } 

            internal override XmlDictionaryString TopLevelElementNamespace 
            {
                get { return topLevelElementNamespace; }
                set { topLevelElementNamespace = value; }
            } 

            internal bool IsTopLevelElementNullable 
            { 
                get { return isTopLevelElementNullable; }
                set { isTopLevelElementNullable = value; } 
            }

            internal bool IsTypeDefinedOnImport
            { 
                get { return isTypeDefinedOnImport; }
                set { isTypeDefinedOnImport = value; } 
            } 

            internal CreateXmlSerializableDelegate CreateXmlSerializableDelegate 
            {
                get { return createXmlSerializable; }
                set { createXmlSerializable = value; }
            } 

        } 
 
        ConstructorInfo GetConstructor()
        { 
            Type type = UnderlyingType;

            if (type.IsValueType)
                return null; 

            ConstructorInfo ctor = type.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, null, Globals.EmptyTypeArray, null); 
            if (ctor == null) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidDataContractException(SR.GetString(SR.IXmlSerializableMustHaveDefaultConstructor, DataContract.GetClrTypeFullName(type))));
 
            return ctor;
        }

        [Fx.Tag.SecurityNote(Critical = "Sets critical properties on XmlDataContract.")] 
        [SecurityCritical]
        internal void SetTopLevelElementName(XmlQualifiedName elementName) 
        { 
            if (elementName != null)
            { 
                XmlDictionary dictionary = new XmlDictionary();
                this.TopLevelElementName = dictionary.Add(elementName.Name);
                this.TopLevelElementNamespace = dictionary.Add(elementName.Namespace);
            } 
        }
 
        [Fx.Tag.SecurityNote(Critical = "Calls CodeGenerator.BeginMethod which is SecurityCritical.", 
            Safe = "Self-contained: returns the delegate to the generated IL but otherwise all IL generation is self-contained here.")]
        [SecuritySafeCritical] 
        internal CreateXmlSerializableDelegate GenerateCreateXmlSerializableDelegate()
        {
            Type type = this.UnderlyingType;
            CodeGenerator ilg = new CodeGenerator(); 
            bool memberAccessFlag = RequiresMemberAccessForCreate(null);
            try 
            { 
                ilg.BeginMethod("Create" + DataContract.GetClrTypeFullName(type), typeof(CreateXmlSerializableDelegate), memberAccessFlag);
            } 
            catch (SecurityException securityException)
            {
                if (memberAccessFlag && securityException.PermissionType.Equals(typeof(ReflectionPermission)))
                { 
                    RequiresMemberAccessForCreate(securityException);
                } 
                else 
                {
                    throw; 
                }
            }
            if (type.IsValueType)
            { 
                System.Reflection.Emit.LocalBuilder local = ilg.DeclareLocal(type, type.Name + "Value");
                ilg.Ldloca(local); 
                ilg.InitObj(type); 
                ilg.Ldloc(local);
            } 
            else
            {
                ilg.New(GetConstructor());
            } 
            ilg.ConvertValue(this.UnderlyingType, Globals.TypeOfIXmlSerializable);
            ilg.Ret(); 
            return (CreateXmlSerializableDelegate)ilg.EndMethod(); 
        }
 
        [Fx.Tag.SecurityNote(Miscellaneous = "RequiresReview - Calculates whether this Xml type requires MemberAccessPermission for deserialization."
            + " Since this information is used to determine whether to give the generated code access"
            + " permissions to private members, any changes to the logic should be reviewed.")]
        bool RequiresMemberAccessForCreate(SecurityException securityException) 
        {
            if (!IsTypeVisible(UnderlyingType)) 
            { 
                if (securityException != null)
                { 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                        new SecurityException(SR.GetString(SR.PartialTrustIXmlSerializableTypeNotPublic, DataContract.GetClrTypeFullName(UnderlyingType)),
                        securityException));
                } 
                return true;
            } 
 
            if (ConstructorRequiresMemberAccess(GetConstructor()))
            { 
                if (securityException != null)
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                        new SecurityException(SR.GetString(SR.PartialTrustIXmlSerialzableNoPublicConstructor, DataContract.GetClrTypeFullName(UnderlyingType)), 
                        securityException));
                } 
                return true; 
            }
 
            return false;
        }

        internal override bool Equals(object other, Dictionary checkedContracts) 
        {
            if (IsEqualOrChecked(other, checkedContracts)) 
                return true; 

            XmlDataContract dataContract = other as XmlDataContract; 
            if (dataContract != null)
            {
                if (this.HasRoot != dataContract.HasRoot)
                    return false; 

                if (this.IsAnonymous) 
                { 
                    return dataContract.IsAnonymous;
                } 
                else
                {
                    return (StableName.Name == dataContract.StableName.Name && StableName.Namespace == dataContract.StableName.Namespace);
                } 
            }
            return false; 
        } 

        public override int GetHashCode() 
        {
            return base.GetHashCode();
        }
 
        public override void WriteXmlValue(XmlWriterDelegator xmlWriter, object obj, XmlObjectSerializerWriteContext context)
        { 
            if (context == null) 
                XmlObjectSerializerWriteContext.WriteRootIXmlSerializable(xmlWriter, obj);
            else 
                context.WriteIXmlSerializable(xmlWriter, obj);
        }

        public override object ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context) 
        {
            object o; 
            if (context == null) 
            {
                o = XmlObjectSerializerReadContext.ReadRootIXmlSerializable(xmlReader, this, true /*isMemberType*/); 
            }
            else
            {
                o = context.ReadIXmlSerializable(xmlReader, this, true /*isMemberType*/); 
                context.AddNewObject(o);
            } 
            xmlReader.ReadEndElement(); 
            return o;
        } 

    }
}
 

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

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