Невозможно отследить нажатие клавиши, когда любое приложение не имеет консоли либо ввод данных на консоли был переадресован из файла. Попробуйте Console.In.Peek.

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Cannot see if a key has been pressed when either application does not have a console or when console input has been redirected from a file. Try Console.In.Peek.

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