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c#enumsenum-flagskeyeventargs

C#: Getting the correct keys pressed from KeyEventArgs' KeyData


I am trapping a KeyDown event and I need to be able to check whether the current keys pressed down are : Ctrl + Shift + M ?


I know I need to use the e.KeyData from the KeyEventArgs, the Keys enum and something with Enum Flags and bits but I'm not sure on how to check for the combination.


Solution

  • You need to use the Modifiers property of the KeyEventArgs class.

    Something like:

    //asumming e is of type KeyEventArgs (such as it is 
    // on a KeyDown event handler
    // ..
    bool ctrlShiftM; //will be true if the combination Ctrl + Shift + M is pressed, false otherwise
    
    ctrlShiftM = ((e.KeyCode == Keys.M) &&               // test for M pressed
                  ((e.Modifiers & Keys.Shift) != 0) &&   // test for Shift modifier
                  ((e.Modifiers & Keys.Control) != 0));  // test for Ctrl modifier
    if (ctrlShiftM == true)
    {
        Console.WriteLine("[Ctrl] + [Shift] + M was pressed");
    }