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POWhy SynchronizationContext does not work properly?
 

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  1. POWhy SynchronizationContext does not work properly?
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    <p>I have following code:</p> <pre><code>[TestMethod] public void StartWorkInFirstThread() { if (SynchronizationContext.Current == null) SynchronizationContext.SetSynchronizationContext( new SynchronizationContext()); var syncContext = SynchronizationContext.Current; Console.WriteLine("Start work in the first thread ({0})", Thread.CurrentThread.ManagedThreadId); var action = ((Action) DoSomethingInSecondThread); action.BeginInvoke(CallbackInSecondThread, syncContext); // Continue its own work } private static void DoSomethingInSecondThread() { Console.WriteLine("Do something in the second thread ({0})", Thread.CurrentThread.ManagedThreadId); } private void CallbackInSecondThread(IAsyncResult ar) { Console.WriteLine("Callback in the second thread ({0})", Thread.CurrentThread.ManagedThreadId); var syncContext = (SynchronizationContext) ar.AsyncState; syncContext.Post(CallbackInFirstThread, null); } private void CallbackInFirstThread(object obj) { Console.WriteLine("Callback in the first thread ({0})", Thread.CurrentThread.ManagedThreadId); } </code></pre> <p>I expect last method to be executed in the first thread, i.e. initial thread where SynchronizationContext is taken from, because I call <code>Post()</code> method of this context. I.e. something like this:</p> <pre><code>Start work in the first thread (28) Do something in the second thread (17) Callback in the second thread (17) Callback in the first thread (28) </code></pre> <p>Isn't it the meaning of SynchronizationContext? But actually I have following output:</p> <pre><code>Start work in the first thread (28) Do something in the second thread (17) Callback in the second thread (17) Callback in the first thread (7) </code></pre> <p><strong>What is the problem? Does something go wrong with SynchronizationContext or I have some misunderstanding?</strong></p> <p><strong>Update:</strong> I call this method as a unit test using Resharper test runner.</p>
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    1. COYou haven't shown us how these are being called, or what's running the synchronization context (e.g. a WinForms event loop). Please update your question with a short but *complete* example.
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    2. COThis is unit test (MS Test Framework), I use Resharper unit test runner.
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