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in my solution i have three project. one is web service (ASMX), another is win form apps from where i am calling the web service. another class library where class has been design extending SoapExtension class. my objective is to capture response & request xml when i am calling web service from my win form apps.i am getting object reference not set error when i am trying to capture xml. <h2>here is my class library source code.</h2> <pre><code>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 } } </code></pre> <h2>here i will show how i am calling web service from win apps</h2> <pre><code> 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; } } </code></pre> this two line is giving object reference error <pre><code> var soapRequest = SoapLogger.TraceExtension.XmlRequest.InnerXml; var soapResponse = SoapLogger.TraceExtension.XmlResponse.InnerXml; </code></pre> i just could not figure out why i am getting error. in win form apps has one app.config where i register my class library assembly to capture the xml. here is my app.config details <pre><code><?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> </code></pre> when i search google just to know how to capture request/response xml then i got this kind of many article. i followed many but nothing works. this url i followed to get the job done <a href="http://jramirezdev.net/blog/c-tip-capturar-los-mensajes-soap-de-un-servicio-asmx-que-hemos-referenciado" rel="nofollow">http://jramirezdev.net/blog/c-tip-capturar-los-mensajes-soap-de-un-servicio-asmx-que-hemos-referenciado</a> what kind of mistake i am making not clear. i set the break point at every method in my class library method but when web service call no method got executed in the class library. i dont want to use any tool like wireshark,fiddler to capture the request/response xml rather want to do same thing programatically. so please guide me what is my mistake. why i am getting object reference not set error. please have a look at my code or go to the url link and tell me what is wrong in my approach.
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How to capture XML when calling web service from win apps
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