Writing to the console using Task.Run() fails

Question

A colleague of mine found an issue with our code and it took a while to hunt down exactly what was happening, but it can be best demonstrated by this simple example:

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Answer 1

Actually, the first case doesn't fail. "Hello World" appears just before the Application ends. This is a classical Race Condition. In the first case,Console.ReadKey() from the main thread beats the task, and in the second case, the task wins. Unfortunately, I cannot tell you Exactly why writing the empty string makes the task win.