Trace WCF

Very Often people ask to me how to configure web.config and app.config of .net website and .net application to emit trace information about WCF communication. So every time I search in my projects those settings.
To avoid this search I put in this blog those settings.

app.config
Below there is a portion of app.config that activate two trace and generate two file.
client_messages.svclog contains trace about messages exchanged between client and server.
client_traces.svclog contains trace about detailed information of System.ServiceModel Activities. 

Principal config sections are: <system.diagnostics> and <diagnostics>.
<system.diagnostics> section is child of  <configuration> element and in this example is at the same level of <appSettings>
<diagnostics> section is child of <system.serviceModel> element that is child of   <configuration> which is at the same level of <appSettings> and <system.diagnostics>

  ...

  </appSettings>

  ...

  <system.diagnostics>

    <sources>

      <source 

        name="System.ServiceModel.MessageLogging"           

        switchValue="Verbose">

        <listeners>

          <add 

            name="xml"       

            type="System.Diagnostics.XmlWriterTraceListener"

            initializeData="c:\temp\client_messages.svclog"/>

        </listeners>

      </source>

      <source 

        name="System.ServiceModel" 

        switchValue="Verbose" 

        propagateActivity="true">

        <listeners>

          <add 

            name="traceListener"

            type="System.Diagnostics.XmlWriterTraceListener" 

            initializeData="c:\temp\client_traces.svclog" />

        </listeners>

      </source>

    </sources>

    <trace autoflush="true"/>

  </system.diagnostics>

  <system.serviceModel>

    <diagnostics>

      <messageLogging 

        logEntireMessage="true"    

        logMalformedMessages="true"

        logMessagesAtServiceLevel="true"

        logMessagesAtTransportLevel="true"

        maxMessagesToLog="1000" />

      <endToEndTracing 

        activityTracing="true"

        messageFlowTracing="true" />

    </diagnostics>

  </system.serviceModel>

web.config
Below there is a portion of web.config that activate two trace and generate two file.
server_messages.svclog contains trace about messages exchanged between server and client.
server_traces.svclog contains trace about detailed information of System.ServiceModel Activities. 

Principal config sections are: <system.diagnostics> and <diagnostics>.
<system.diagnostics> section is child of  <configuration> element and in this example is at the same level of <system.web>
<diagnostics> section is child of <system.serviceModel> element that is child of   <configuration> which is at the same level of <system.web> and <system.diagnostics>

  ...

  </system.web>

  ... 

  <system.diagnostics>

    <sources>

      <source 

        name="System.ServiceModel.MessageLogging" 

        switchValue="Verbose">

        <listeners>

          <add 

            name="xml" 

            type="System.Diagnostics.XmlWriterTraceListener" 

            initializeData="c:\temp\server_messages.svclog"/>

        </listeners>

      </source>

      <source 

        name="System.ServiceModel" 

        switchValue="Verbose" 

        propagateActivity="true">

        <listeners>

          <add 

            name="traceListener" 

            type="System.Diagnostics.XmlWriterTraceListener"                 initializeData="c:\temp\server_traces.svclog" />

        </listeners>

      </source>

    </sources>

  </system.diagnostics>

  <system.serviceModel>

    <diagnostics>

      <messageLogging 

        logEntireMessage="true" 

        maxMessagesToLog="1000" 

        logMessagesAtServiceLevel="true"        

        logMalformedMessages="true" 

        logMessagesAtTransportLevel="true"/>

    </diagnostics>

  </system.serviceModel>

Note 

Notate that every file has ".svclog" as file name extension.

In this way the file are opened automatically by Microsoft Service Trace Viewer.