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    <p>You can implement a SoapExtension that logs the full request and response to a log file. You can then enable the SoapExtension in the web.config, which makes it easy to turn on/off for debugging purposes. Here is an example that I have found and modified for my own use, in my case the logging was done by log4net but you can replace the log methods with your own.</p> <pre><code>public class SoapLoggerExtension : SoapExtension { private static readonly ILog log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); private Stream oldStream; private Stream newStream; public override object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute) { return null; } public override object GetInitializer(Type serviceType) { return null; } public override void Initialize(object initializer) { } public override System.IO.Stream ChainStream(System.IO.Stream stream) { oldStream = stream; newStream = new MemoryStream(); return newStream; } public override void ProcessMessage(SoapMessage message) { switch (message.Stage) { case SoapMessageStage.BeforeSerialize: break; case SoapMessageStage.AfterSerialize: Log(message, "AfterSerialize"); CopyStream(newStream, oldStream); newStream.Position = 0; break; case SoapMessageStage.BeforeDeserialize: CopyStream(oldStream, newStream); Log(message, "BeforeDeserialize"); break; case SoapMessageStage.AfterDeserialize: break; } } public void Log(SoapMessage message, string stage) { newStream.Position = 0; string contents = (message is SoapServerMessage) ? "SoapRequest " : "SoapResponse "; contents += stage + ";"; StreamReader reader = new StreamReader(newStream); contents += reader.ReadToEnd(); newStream.Position = 0; log.Debug(contents); } void ReturnStream() { CopyAndReverse(newStream, oldStream); } void ReceiveStream() { CopyAndReverse(newStream, oldStream); } public void ReverseIncomingStream() { ReverseStream(newStream); } public void ReverseOutgoingStream() { ReverseStream(newStream); } public void ReverseStream(Stream stream) { TextReader tr = new StreamReader(stream); string str = tr.ReadToEnd(); char[] data = str.ToCharArray(); Array.Reverse(data); string strReversed = new string(data); TextWriter tw = new StreamWriter(stream); stream.Position = 0; tw.Write(strReversed); tw.Flush(); } void CopyAndReverse(Stream from, Stream to) { TextReader tr = new StreamReader(from); TextWriter tw = new StreamWriter(to); string str = tr.ReadToEnd(); char[] data = str.ToCharArray(); Array.Reverse(data); string strReversed = new string(data); tw.Write(strReversed); tw.Flush(); } private void CopyStream(Stream fromStream, Stream toStream) { try { StreamReader sr = new StreamReader(fromStream); StreamWriter sw = new StreamWriter(toStream); sw.WriteLine(sr.ReadToEnd()); sw.Flush(); } catch (Exception ex) { string message = String.Format("CopyStream failed because: {0}", ex.Message); log.Error(message, ex); } } } [AttributeUsage(AttributeTargets.Method)] public class SoapLoggerExtensionAttribute : SoapExtensionAttribute { private int priority = 1; public override int Priority { get { return priority; } set { priority = value; } } public override System.Type ExtensionType { get { return typeof (SoapLoggerExtension); } } } </code></pre> <p>You then add the following section to your web.config where YourNamespace and YourAssembly point to the class and assembly of your SoapExtension:</p> <pre><code>&lt;webServices&gt; &lt;soapExtensionTypes&gt; &lt;add type="YourNamespace.SoapLoggerExtension, YourAssembly" priority="1" group="0" /&gt; &lt;/soapExtensionTypes&gt; &lt;/webServices&gt; </code></pre>
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