Informikon

The keyboard can also be processed by overriding the appropriate method of the Control class. Here we overrride the method OnKeyDown which is called everytimes the user press a key.

 
using System;
using System.Windows.Forms;
class KeyBoardSample : Form {
  public static void Main() {
    Application.Run( new KeyBoardSample() );
  }
  protected override void OnKeyDown( KeyEventArgs e ) {
    if( e.KeyCode == Keys.Enter )
      MessageBox.Show( "You press Enter" );
  }  
}
 
   

The method OnKeyDown of the Control class expects a KeyEventArgs as argument. An object of the type KeyEventArgs has a KeyCode property which can be used for testing against the values of the Keys enumeration.

Here we test for the Enter key and we display a message box when the user has pressed that key.

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