c# - Why does Dispatcher.Invoke not execute the delegate argument in this example? -

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    [test]     public void a()     {         var d = dispatcher.currentdispatcher;          action action = () => console.writeline("dispatcher invoked me!");          var worker = new backgroundworker();         worker.dowork += somework;          //worker.runworkerasync( (action) delegate { console.writeline("this works!"); } );         worker.runworkerasync((action) delegate { d.invoke(action); } );          system.threading.thread.sleep(2500);     }      private void somework(object sender, doworkeventargs e)     {         (e.argument action)();     }

this block of code doesn't throw exception. @ same time, dispatcher.invoke nothing. found odd.

i extracted helper method base viewmodel. worker threads used method doonuithread() avoid thread affinity issue. in unit-tests, find attempting test view model objects results in failures due above issue.

i move whole behavior out pluggable dependency substitute in tests. e.g. viewmodelbase depends on uithreadexecutor.execute(action) , use fake calls action in tests. i'm curious why dispatcher behaves way does..

dispatcher can perform begin/invoke() duty when main thread goes idle , re-enters dispatch loop. @ point main thread quiescent , can safely execute dispatched requests. notifications sent windows.

it isn't idle in case, stuck inside of sleep(2500).


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