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POAsync/Await: Unexpected behaviour of ConfigureAwait
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copied!<p>If you execute the following code in ASP.NET MVC, you can see in Debugging Window that it will correctly restore the thread's culture after <code>await</code>, even if ManagedThreadId changes:</p> <pre><code>public async Task<ActionResult> Index() { Thread.CurrentThread.CurrentUICulture = new CultureInfo("de-DE"); Debug.WriteLine(Thread.CurrentThread.ManagedThreadId); Debug.WriteLine(Thread.CurrentThread.CurrentUICulture); await SomeMethod(); Debug.WriteLine(Thread.CurrentThread.ManagedThreadId); Debug.WriteLine(Thread.CurrentThread.CurrentUICulture); return View(); } private async Task SomeMethod() { await Task.Delay(100).ConfigureAwait(false); } </code></pre> <p>Then I just move ConfigureAwait(false) from SomeMethod() to Index(), except for this, it's the same code as above:</p> <pre><code>public async Task<ActionResult> Index() { Thread.CurrentThread.CurrentUICulture = new CultureInfo("de-DE"); Debug.WriteLine(Thread.CurrentThread.ManagedThreadId); Debug.WriteLine(Thread.CurrentThread.CurrentUICulture); await SomeMethod().ConfigureAwait(false); Debug.WriteLine(Thread.CurrentThread.ManagedThreadId); Debug.WriteLine(Thread.CurrentThread.CurrentUICulture); return View(); } private async Task SomeMethod() { await Task.Delay(100); } </code></pre> <p>Now it doesn't restore my culture but always set it to <code>new CultureInfo("en-US")</code>. But I expect that using both methods, the result must be the same. It's absolutely unclear, why it's happening.</p>

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