ExtensionDataObject 未标记为可序列化

Question

喂！

我在序列化会话状态时遇到问题。我们有 2 个组件，我们的 WCF 和 Web。基于我们的 AdministrationPartial.cs 和 Administration.svc，我们使用以下 .bat 文件为我们的 Web 项目生成 "Administration.cs" 代码：

svcutil.exe http://wcf_url.local/Administration.svc?wsdl /r:"{Path}\{Namespace}.dll" /d:"{Path}\{Namespace}\Code"

我从上述声明中删除了个人数据，并将其替换为{path} 和{namespace}。 Administration.cs 将在代码映射中。

在部分中我们有：

[Serializable]
public partial class MyObject
{
    <Some code>
}

它生成了以下代码：

namespace {mynamespace}
{
          using System.Runtime.Serialization

          [System.Diagnostics.DebuggerStepThroughAttribute()]
          [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Runtime.Serialization", "4.0.0.0")]
          [System.Runtime.Serialization.DataContractAttribute(Name="MyObject", Namespace="http://schemas.datacontract.org/2004/07/{namespace}")]
          public partial class MyObject : object, System.Runtime.Serialization.IExtensibleDataObject
          {
                    private System.Runtime.Serialization.ExtensionDataObject extensionDataField;
                    ...... generated code

我做错了什么？

蒂姆

编辑：实际错误是：Type 'System.Runtime.Serialization.ExtensionDataObject' in Assembly 'System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable.

Answer 1

看来您的问题是，我怎样才能为 BinaryFormatter 创建 [Serializable] 的 class 并为 [ 实现 IExtensibleDataObject =15=]?

答案是这不是开箱即用的，因为正如您所注意到的，ExtensionDataObject is not marked as serializable. Nevertheless it can be done with a bit of extra coding. For whatever reason Microsoft chose to make ExtensionDataObject a completely opaque pointer, with no public properties or other ways to access the data therein. Except that it is possible to access the data inside by re-serializing to XML using DataContractSerializer. This suggests a way to make your MyObject class serializable: store the extension data in a proxy container field that implements ISerializable 并且在内部将扩展数据序列化和反序列化为 XML。

以下代理包装器完成此任务：

[Serializable]
public struct ExtensionDataObjectSerializationProxy : ISerializable
{
    public static implicit operator ExtensionDataObjectSerializationProxy(ExtensionDataObject data) { return new ExtensionDataObjectSerializationProxy(data); }

    public static implicit operator ExtensionDataObject(ExtensionDataObjectSerializationProxy proxy) { return proxy.ExtensionData; }

    private readonly System.Runtime.Serialization.ExtensionDataObject extensionDataField;

    public ExtensionDataObject ExtensionData { get { return extensionDataField; } }

    [DataContract(Name = "ExtensionData", Namespace = "")]
    sealed class ExtensionDataObjectSerializationContractProxy : IExtensibleDataObject
    {
        private System.Runtime.Serialization.ExtensionDataObject extensionDataField;

        #region IExtensibleDataObject Members

        public ExtensionDataObject ExtensionData
        {
            get
            {
                return extensionDataField;
            }
            set
            {
                extensionDataField = value;
            }
        }

        #endregion
    }

    public ExtensionDataObjectSerializationProxy(ExtensionDataObject extensionData)
    {
        this.extensionDataField = extensionData;
    }

    public ExtensionDataObjectSerializationProxy(SerializationInfo info, StreamingContext context)
    {
        var xml = (string)info.GetValue("ExtensionData", typeof(string));
        if (!string.IsNullOrEmpty(xml))
        {
            var wrapper = DataContractSerializerHelper.LoadFromXML<ExtensionDataObjectSerializationContractProxy>(xml);
            extensionDataField = (wrapper == null ? null : wrapper.ExtensionData);
        }
        else
        {
            extensionDataField = null;
        }
    }

    #region ISerializable Members

    void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
    {
        if (ExtensionData != null)
        {
            var xml = DataContractSerializerHelper.GetXml(new ExtensionDataObjectSerializationContractProxy { ExtensionData = this.ExtensionData });
            info.AddValue("ExtensionData", xml);
        }
        else
        {
            info.AddValue("ExtensionData", (string)null);
        }
    }

    #endregion
}

public static class DataContractSerializerHelper
{
    public static string GetXml<T>(T obj, DataContractSerializer serializer = null)
    {
        using (var textWriter = new StringWriter())
        {
            using (var xmlWriter = XmlWriter.Create(textWriter))
            {
                (serializer ?? new DataContractSerializer(typeof(T))).WriteObject(xmlWriter, obj);
            }
            return textWriter.ToString();
        }
    }

    public static T LoadFromXML<T>(string xml, DataContractSerializer serializer = null)
    {
        using (var textReader = new StringReader(xml ?? ""))
        using (var xmlReader = XmlReader.Create(textReader))
        {
            return (T)(serializer ?? new DataContractSerializer(typeof(T))).ReadObject(xmlReader);
        }
    }
}

然后手动修改你的MyObjectclass如下：

public partial class MyObject : object, System.Runtime.Serialization.IExtensibleDataObject
{
    private ExtensionDataObjectSerializationProxy extensionDataField; // Use the proxy not ExtensionDataObject directly

    public ExtensionDataObject ExtensionData
    {
        get
        {
            return extensionDataField;
        }
        set
        {
            extensionDataField = value;
        }
    }
}

Answer 2

更简单的答案见：http://blogs.msdn.com/b/mohamedg/archive/2010/02/15/extensiondataobject-is-not-marked-as-serializable.aspx

只需将私有 ExtensionDataObject 标记为非序列化：

[NonSerialized]
private System.Runtime.Serialization.ExtensionDataObject extensionDataField;

ExtensionDataObject 未标记为可序列化

ExtensionDataObject not marked as serializable

c#

wcf

serialization

datacontractserializer

binaryformatter