SoapExtension不记录日志

Question

我想记录对WSDL扩展的soap调用，我使用SoapExtension来记录请求数据。但它没有记录日志 我的代码在这里

namespace Connector.App.Managers
{
public class TraceExtension : SoapExtension
{
    Stream oldStream;
    Stream newStream;
    string filename;

    // Save the Stream representing the SOAP request or SOAP response into
    // a local memory buffer.
    public override Stream ChainStream(Stream stream)
    {
        oldStream = stream;
        newStream = new MemoryStream();
        return newStream;
    }

    // When the SOAP extension is accessed for the first time, the XML Web
    // service method it is applied to is accessed to store the file
    // name passed in, using the corresponding SoapExtensionAttribute.  
    public override object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute)
    {
        return ((TraceExtensionAttribute)attribute).Filename;
    }

    // The SOAP extension was configured to run using a configuration file
    // instead of an attribute applied to a specific XML Web service
    // method.
    public override object GetInitializer(Type WebServiceType)
    {
        // Return a file name to log the trace information to, based on the
        // type.
        return "C:\\" + WebServiceType.FullName + ".log";
    }

    // Receive the file name stored by GetInitializer and store it in a
    // member variable for this specific instance.
    public override void Initialize(object initializer)
    {
        filename = (string)initializer;
    }

    //  If the SoapMessageStage is such that the SoapRequest or
    //  SoapResponse is still in the SOAP format to be sent or received,
    //  save it out to a file.
    public override void ProcessMessage(SoapMessage message)
    {
        switch (message.Stage)
        {
            case SoapMessageStage.BeforeSerialize:
                break;
            case SoapMessageStage.AfterSerialize:
                WriteOutput(message);
                break;
            case SoapMessageStage.BeforeDeserialize:
                WriteInput(message);
                break;
            case SoapMessageStage.AfterDeserialize:
                break;
        }
    }

    public void WriteOutput(SoapMessage message)
    {
        newStream.Position = 0;
        FileStream fs = new FileStream(filename, FileMode.Append,
            FileAccess.Write);
        StreamWriter w = new StreamWriter(fs);

        string soapString = (message is SoapServerMessage) ? "SoapResponse" : "SoapRequest";
        w.WriteLine("-----" + soapString + " at " + DateTime.Now);
        w.Flush();
        Copy(newStream, fs);
        w.Close();
        newStream.Position = 0;
        Copy(newStream, oldStream);
    }

    public void WriteInput(SoapMessage message)
    {
        Copy(oldStream, newStream);
        FileStream fs = new FileStream(filename, FileMode.Append,
            FileAccess.Write);
        StreamWriter w = new StreamWriter(fs);

        string soapString = (message is SoapServerMessage) ?
            "SoapRequest" : "SoapResponse";
        w.WriteLine("-----" + soapString +
            " at " + DateTime.Now);
        w.Flush();
        newStream.Position = 0;
        Copy(newStream, fs);
        w.Close();
        newStream.Position = 0;
    }

    void Copy(Stream from, Stream to)
    {
        TextReader reader = new StreamReader(from);
        TextWriter writer = new StreamWriter(to);
        writer.WriteLine(reader.ReadToEnd());
        writer.Flush();
    }
}
}

SoapExtensionAttribute就在这里

namespace Connector.App.Managers
{
// Create a SoapExtensionAttribute for the SOAP Extension that can be
    // applied to an XML Web service method.
    [AttributeUsage(AttributeTargets.Method)]
    public class TraceExtensionAttribute : SoapExtensionAttribute
    {

        private string filename = "c:\\log.txt";
        private int priority;

        public override Type ExtensionType
        {
            get { return typeof(TraceExtension); }
        }

        public override int Priority
        {
            get { return priority; }
            set { priority = value; }
        }

        public string Filename
        {
            get
            {
                return filename;
            }
            set
            {
                filename = value;
            }
        }
    }
}

App config就在这里

<system.web>
    <webServices>
      <soapExtensionTypes>
        <add type="Connector.App.Managers, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" priority="1" group="High" />
      </soapExtensionTypes>
    </webServices>
  </system.web>

我的代码有什么问题，有人可以解释

由于 马赫什