Serializer.cs source code in C# .NET

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                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Annotations / Serializer.cs / 1 / Serializer.cs
                        

                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//     Serializer performs the boot-strapping to call the public implementations 
//     of IXmlSerializable for the Annotation object model.  This would normally
//     be done by XmlSerializer but its slow and causes an assembly to be generated 
//     at runtime.  API-wise third-parties can still use XmlSerializer but we
//     choose not to for our purposes.
//
// History: 
//  08/26/2004: [....]:    Added new serializer class.
// 
//----------------------------------------------------------------------------- 
using System;
using System.Diagnostics; 
using System.Reflection;
using System.Windows.Annotations.Storage;
using System.Xml;
using System.Xml.Schema; 
using System.Xml.Serialization;
using MS.Internal; 
 
namespace MS.Internal.Annotations
{ 
    /// 
    ///     Serializer class for Annotation object model.  All entities
    ///     in the object model implement IXmlSerializable (or are
    ///     contained and serialized by an entity that does).  This class 
    ///     does the simple boot-strapping for serializing/deserializing
    ///     of the object model.  This lets us get by without paying the 
    ///     cost of XmlSerializer (which generates a run-time assembly). 
    /// 
    internal class Serializer 
    {
        /// 
        ///     Creates an instance of the serializer for the specified type.
        ///     We use the type to get the default constructor and the type's 
        ///     element name and namespace.  This constructor expects the
        ///     type to be attributed with XmlRootAttribute (as all serializable 
        ///     classes in the object model are). 
        /// 
        /// the type to be serialized by this instance 
        public Serializer(Type type)
        {
            Invariant.Assert(type != null);
 
            // Find the XmlRootAttribute for the type
            object[] attributes = type.GetCustomAttributes(false); 
            foreach (object obj in attributes) 
            {
                _attribute = obj as XmlRootAttribute; 
                if (_attribute != null)
                    break;
            }
 
            Invariant.Assert(_attribute != null, "Internal Serializer used for a type with no XmlRootAttribute.");
 
            // Get the default constructor for the type 
            _ctor = type.GetConstructor(new Type[0]);
        } 

        /// 
        ///     Serializes the object to the specified XmlWriter.
        ///  
        /// writer to serialize to
        /// object to serialize 
        public void Serialize(XmlWriter writer, object obj) 
        {
            Invariant.Assert(writer != null && obj != null); 

            IXmlSerializable serializable = obj as IXmlSerializable;
            Invariant.Assert(serializable != null, "Internal Serializer used for a type that isn't IXmlSerializable.");
 
            writer.WriteStartElement(_attribute.ElementName, _attribute.Namespace);
            serializable.WriteXml(writer); 
            writer.WriteEndElement(); 
        }
 
        /// 
        ///     Deserializes the next object from the reader.  The
        ///     reader is expected to be positioned on a node that
        ///     can be deserialized into the type this serializer 
        ///     was instantiated for.
        ///  
        /// reader to deserialize from 
        /// an instance of the type this serializer was instanted
        /// for with values retrieved from the reader 
        public object Deserialize(XmlReader reader)
        {
            Invariant.Assert(reader != null);
 
            IXmlSerializable serializable = (IXmlSerializable)_ctor.Invoke(new object[0]);
 
            // If this is a brand-new stream we need to jump into it 
            if (reader.ReadState == ReadState.Initial)
            { 
                reader.Read();
            }

            serializable.ReadXml(reader); 

            return serializable; 
        } 

        // XmlRootAttribute - specifies the ElementName and Namespace for 
        // the node to read/write
        private XmlRootAttribute _attribute;
        // Constructor used to create instances when deserializing
        private ConstructorInfo _ctor; 
    }
} 

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

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