Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Annotations / Serializer.cs / 1305600 / 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: rruiz: 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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