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Difference between 12 ways of waiting?

deleyd asked
Last Modified: 2020-02-25
I can call the following 3 methods, which all achieve the same delay of 2 seconds, in 12 different ways.

I'm interested in the underlying details of these 12 different calls differ under the hood. Exactly what does each do behind the scenes and how do they differ?

        private async Task AsyncDelay()
            await Task.Delay(2000);

        private void FooSleep()

        private void TaskDelayWait()

            Task.Run(() => FooSleep()).Wait();
            Task.Run(() => TaskDelayWait()).Wait();
            Task.Run(() => AsyncDelay()).Wait();
            Task.Run(async () => await AsyncDelay()).Wait();
            await AsyncDelay();
            await Task.Run(() => FooSleep());
            await Task.Run(() => TaskDelayWait());
            await Task.Run(() => AsyncDelay());
            await Task.Run(async () => await AsyncDelay());

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