How to pass principal to WorkflowApplication

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WWF

multi-threading

When starting a new workflow with WorkflowApplication in asynchronous way. From NativeActivity I canot gain the mainthread principal by using Thread.CurrentPrincipal. How to pass the mainthread principal to the workflow thread? Thanks!

The code to start a workflow:

var wfApp = new WorkflowApplication(flowObject, inputs);

var syncConext = SynchronizationContext.Current;
wfApp.SynchronizationContext = syncConext;

wfApp.PersistableIdle = (e) =>
{
    insUnloaded.Set();
    return PersistableIdleAction.Unload;
};

wfApp.OnUnhandledException = (e) =>
{
    return UnhandledExceptionAction.Terminate;
};

wfApp.Aborted = (args) =>
{
    syncConext.OperationCompleted();
};

wfApp.Unloaded = (e) =>
{
    insUnloaded.Set();
};

wfApp.Completed = (e) =>
{
    syncConext.OperationCompleted();
};

wfApp.Run();

insUnloaded.WaitOne();

The Code in workflow NativeActivity :

public class PortalActivity : NativeActivity
{
    protected override void Execute(NativeActivityContext context)
    {
       // SysPrincipal is a customized principal that implemented the IPrincipal interface,
       // the CurrentPrincipal of main thread has been set as this type of principal
       // here return null
       var principal = Thread.CurrentPrincipal as SysPrincipal;

       // ....
    }

    protected override bool CanInduceIdle
    {
        get
        {
            return true;
        }
    }

    #endregion
}