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在我的解决方案中，我有三个项目。一个是 Web 服务 (ASMX)，另一个是我调用 Web 服务的 win 表单应用程序。另一个类库，其中类已设计扩展 SoapExtension 类。

我的目标是在我从我的 win 表单应用程序调用 Web 服务时捕获响应和请求 xml。当我尝试捕获 xml 时，我得到对象引用未设置错误。

这是我的类库源代码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.IO;
using System.Net;
using System.Xml;

namespace SoapLogger
{
public class TraceExtension : SoapExtension
{
    private Stream oldStream;
    private Stream newStream;

    private static XmlDocument xmlRequest;
    /// <summary>
    /// Gets the outgoing XML request sent to PayPal
    /// </summary>
    public static XmlDocument XmlRequest
    {
        get { return xmlRequest; }
    }

    private static XmlDocument xmlResponse;
    /// <summary>
    /// Gets the incoming XML response sent from PayPal
    /// </summary>
    public static XmlDocument XmlResponse
    {
        get { return xmlResponse; }
    }

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

    /// <summary>
    /// If the SoapMessageStage is such that the SoapRequest or
    /// SoapResponse is still in the SOAP format to be sent or received,
    /// save it to the xmlRequest or xmlResponse property.
    /// </summary>
    /// <param name="message">
    public override void ProcessMessage(SoapMessage message)
    {
        switch (message.Stage)
        {
            case SoapMessageStage.BeforeSerialize:
                break;
            case SoapMessageStage.AfterSerialize:
                xmlRequest = GetSoapEnvelope(newStream);
                CopyStream(newStream, oldStream);
                break;
            case SoapMessageStage.BeforeDeserialize:
                CopyStream(oldStream, newStream);
                xmlResponse = GetSoapEnvelope(newStream);
                break;
            case SoapMessageStage.AfterDeserialize:
                break;
        }
    }

    /// <summary>
    /// Returns the XML representation of the Soap Envelope in the supplied stream.
    /// Resets the position of stream to zero.
    /// </summary>
    /// <param name="stream">
    /// <returns></returns>
    private XmlDocument GetSoapEnvelope(Stream stream)
    {
        XmlDocument xml = new XmlDocument();
        stream.Position = 0;
        StreamReader reader = new StreamReader(stream);
        xml.LoadXml(reader.ReadToEnd());
        stream.Position = 0;
        return xml;
    }

    /// <summary>
    /// Copies a stream.
    /// </summary>
    /// <param name="from">
    /// <param name="to">
    private void CopyStream(Stream from, Stream to)
    {
        TextReader reader = new StreamReader(from);
        TextWriter writer = new StreamWriter(to);
        writer.WriteLine(reader.ReadToEnd());
        writer.Flush();
    }
    #region NoOp
    /// <summary>
    /// Included only because it must be implemented.
    /// </summary>
    /// <param name="methodInfo">
    /// <param name="attribute">
    /// <returns></returns>
    public override object GetInitializer(LogicalMethodInfo methodInfo,
        SoapExtensionAttribute attribute)
    {
        return null;
    }

    /// <summary>
    /// Included only because it must be implemented.
    /// </summary>
    /// <param name="WebServiceType">
    /// <returns></returns>
    public override object GetInitializer(Type WebServiceType)
    {
        return null;
    }

    /// <summary>
    /// Included only because it must be implemented.
    /// </summary>
    /// <param name="initializer">
    public override void Initialize(object initializer)
    {
    }
    #endregion NoOp
}
}

在这里，我将展示我如何从 win 应用程序调用 Web 服务

    private void button1_Click(object sender, EventArgs e)
    {

        using (ServiceRef.TestServiceSoapClient oService = new ServiceRef.TestServiceSoapClient())
        {
            textBox1.Text = oService.HelloWorld("Sudip");
            var soapRequest = SoapLogger.TraceExtension.XmlRequest.InnerXml;
            var soapResponse = SoapLogger.TraceExtension.XmlResponse.InnerXml;
        }
    }

这两行给出了对象引用错误

            var soapRequest = SoapLogger.TraceExtension.XmlRequest.InnerXml;
            var soapResponse = SoapLogger.TraceExtension.XmlResponse.InnerXml;

我只是不知道为什么我会出错。

在 win 形式的应用程序中有一个 app.config，我在其中注册我的类库程序集以捕获 xml。这是我的 app.config 详细信息

<?xml version="1.0"?>
<configuration>
<system.serviceModel>
    <bindings>
        <basicHttpBinding>
            <binding name="TestServiceSoap"/>
        </basicHttpBinding>
    </bindings>
    <client>
        <endpoint address="http://localhost:6804/Service1.asmx" binding="basicHttpBinding" bindingConfiguration="TestServiceSoap" contract="ServiceRef.TestServiceSoap" name="TestServiceSoap"/>
    </client>
</system.serviceModel>

<system.web>
<compilation debug="true" targetFramework="4.0" />
<webServices>
  <soapExtensionTypes>
    <add type="SoapLogger.TraceExtension,SoapLogger" priority="1" group="0" />
  </soapExtensionTypes>
</webServices>
</system.web>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/> </startup>    
</configuration>

当我搜索谷歌只是为了知道如何捕获请求/响应 xml 时，我得到了很多这样的文章。我关注了很多，但没有任何效果。

我遵循这个网址来完成工作 http://jramirezdev.net/blog/c-tip-capturar-los-mensajes-soap-de-un-servicio-asmx-que-hemos-referenciado

我犯了什么样的错误并不清楚。我在类库方法中的每个方法处都设置了断点，但是当 Web 服务调用时，类库中没有执行任何方法。我不想使用像wireshark、fiddler这样的工具来捕获请求/响应xml，而是想以编程方式做同样的事情。

所以请指导我我的错误是什么。为什么我得到对象引用未设置错误。请查看我的代码或转到 url 链接并告诉我我的方法有什么问题。

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