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Tracing Workflow Foundation

Figuring out what is going on can be a challenge. Fortunately they added a number of trace switches to allow you to track what the components are doing. Add the following to the app.config file to see what is going on:

      <add name="System.Workflow LogToTraceListeners" value="1" />

      <add name="System.Workflow.Runtime.Hosting"     value="Verbose" />
      <add name="System.Workflow.Runtime"             value="Verbose" />
      <add name="System.Workflow.Runtime.Tracking"    value="Verbose" />
      <add name="System.Workflow.Activities"          value="Verbose" />
      <add name="System.Workflow.Activities.Rules"    value="Verbose" />
        <add name="ConsoleTraceListener" type="System.Diagnostics.ConsoleTraceListener" />

Valid value are:

Off No messages
Error Only error messages
Warning Error and warning messages
Information Information, error and warning messages
Verbose All kind of messages

If you are tracing a workflow hosted in IIS you need to make sure that the IIS worker process has the necessary rights to create and write to the log file specified.

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