Как вклиниться в Thread?

Метод Init() не завершится, пока не будет вызван BeginInvokeShutdown();

private void Init()  
{     
    Thread workerThread = new Thread(new ParameterizedThreadStart(DoWork));     
    workerThread.IsBackground = true;     
    workerThread.Start(Dispatcher.Current);                 

    Dispatcher.Run();  
    // Once shutdown you cannot restart the dispatcher in this appdomain  
}    
void DoWork(object startArg) 
{  
    Dispatcher targetDispatcher = startArg as Dispatcher;  
    if(targetDispatcher == null) {  
       // Log error  
       return;  
    }  
    while(working)   
    {  
       targetDispatcher.BeginInvoke(....);  
    }  
    targetDispatcher.BeginInvokeShutdown(...);  
}