Handle the keys in Silverlight

Introduction : This blog introduces how to handle the keys in Silverlight. 

If we want to which key is pressed,we can identify with the help of keys, ModifierKeys in silverlight. 

Explantion : 

1.Handle Shift case :On Textbox KeyDown Event.

Here we don't allow the user to enter the Special characters in textbox. 

private void usertext_KeyDown(object sender, KeyEventArgs e)
{
    if (Keyboard.Modifiers == ModifierKeys.Shift)
    {
        e.Handled = true;
        MessageBox.Show("Please Enter Numbers Only");
    }
} 

Handle other cases : 

    if (!e.Handled && (e.Key < Key.D0 || e.Key > Key.D9))
    {
       if (e.Key < Key.NumPad0 || e.Key > Key.NumPad9)
         {
             if (e.Key != Key.Back)
               {
                   e.Handled = true;
                }
          }
      } 

Suppose we want to handle tab key on textbox keydown event.From that we can select full text in textbox by pressing tab. 

private void usertext_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Tab)
    {
        passbox.SelectAll();
    }
}

2. ModifierKeys Enumeration

Specifies the set of modifier keys. 

  1. None: No modifiers are pressed.
  2. Alt: The ALT key is pressed.
  3. Control: The CTRL key is pressed.
  4. Shift: The SHIFT key is pressed.
  5. Windows: The Windows logo key is pressed.
  6. Apple: The Apple key (also known as the Open Apple key) is pressed.