C#SOAP Web服务客户端 - 显示如何记录所有原始SOAP输入和输出的示例？

using System;
using System.IO;
using System.Web.Services.Protocols;
using System.Xml;

public class LoggingSoapExtension : SoapExtension
{
    private Stream _originalStream;
    private Stream _logStream;

    public override Stream ChainStream(Stream stream)
    {
        _originalStream = stream;
        _logStream = new MemoryStream();
        return _logStream;
    }

    public override void ProcessMessage(SoapMessage message)
    {
        switch (message.Stage)
        {
            case SoapMessageStage.BeforeSerialize:
                break;
            case SoapMessageStage.AfterSerialize:
                LogSoapMessage("Output", _logStream);
                _logStream.Position = 0;
                CopyStream(_logStream, _originalStream);
                break;
            case SoapMessageStage.BeforeDeserialize:
                LogSoapMessage("Input", _originalStream);
                break;
            case SoapMessageStage.AfterDeserialize:
                break;
        }
    }

    private void LogSoapMessage(string direction, Stream stream)
    {
        stream.Position = 0;
        var reader = new StreamReader(stream);
        var soapMessage = reader.ReadToEnd();
        Console.WriteLine($"SOAP {direction} message:");
        Console.WriteLine(soapMessage);
    }

    private void CopyStream(Stream fromStream, Stream toStream)
    {
        var buffer = new byte[4096];
        int bytesRead;
        do
        {
            bytesRead = fromStream.Read(buffer, 0, buffer.Length);
            toStream.Write(buffer, 0, bytesRead);
        } while (bytesRead > 0);
    }
}

 <system.web>
    <webServices>
      <soapExtensionTypes>
        <add type="LoggingSoapExtension" priority="1" group="0" />
      </soapExtensionTypes>
    </webServices>
  </system.web>
</configuration>