Disabling Alt+F4 key press in WPF

Introduction

This article shows you how to disable default behaviour of closing current window of Alt+F4 key press.Although very basic, when i googled for it i could not find a direct answer. This article will help beginners like me.

Using the code

In your Window code have a bool variable altF4Pressed and handle key down event with the following method

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 private void Window_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
      {
          if (Keyboard.Modifiers == ModifierKeys.Alt && e.SystemKey== Key.F4)
          {
              altF4Pressed = true;
          }
      }
 

Now handle closing event of window with following method

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       private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
      {
          if (altF4Pressed)
          {
              e.Cancel = true;
              altF4Pressed = false;
          }
      }                                                                                                 

Thats it you are done.

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