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[Console Program] Console.CancelKeyPress is introduced

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Posted on 1/22/2018 9:25:08 AM | | | |
Use this event in combination with System.ConsoleCancelEventHandler and System.ConsoleCancelEventArgs. The CancelKeyPress event can intercept the Ctrl+C signal so that the event handler can decide whether to continue execution or terminate the console application. For more information about handling events, see Handling and raising events.
When the user presses Ctrl+C or Ctrl+Break, CancelKeyPress triggers the event and the application's ConsoleCancelEventHandler executes the event handler. The event handler passes the ConsoleCancelEventArgs object with two useful properties:
SpecialKey: It determines whether the user calls the handler by pressing Ctrl+C (the property value will be ConsoleSpecialKey.ControlC) or Ctrl+Break (the property value will be ConsoleSpecialKey.ControlBreak).
Cancel, which determines how the application should respond to the user by pressing Ctrl+C or Ctrl+Break. By default, the Cancel property is false for the reason that the program terminates the execution when the handler exits. Changing its property to true specifies that the application should continue to execute.

//
        Summary:
        When System.ConsoleModifiers.Control modify the key (Ctrl) and System.ConsoleKey.C console key
        (C) or Break keys are held down (Ctrl+C or Ctrl+Break) at the same time.
        public static event ConsoleCancelEventHandler CancelKeyPress;

msdn：https://msdn.microsoft.com/zh-cn/library/system.console.cancelkeypress.aspx



In the scenario, we open a thread and write a while(running) deadloop, which can control whether the program runs or not through variables.





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