Create a WPF text box which only responds to character key presses and few selected editing key presses

Question

The WPF text box responds to quite a number of editing commands. I want to eliminate the vast majority and have it respond to any text input and few editing commands like backspace & delete. I know I can handle the KeyDown event but I can't see any easy way of distinguishing between character input and editing key strokes.

Answer 1

WPF does not have a built-in masked text box under .NET 3.5.
You will find lots of starting places if you search google and stackoverflow for: WPF Masked TextBox

Answer 2

You can use the Preview events. They happen before the actual key events that actually perform the work. For instance, if you want to disable the down arrow for moving up and down in text, in the PreviewKeyDownEvent you would check 'e.Key' for the down key, and if found, and set e.Handled = true. This effectively removes that key press from the processing. As such, KeyDown will never get called.

Using this method you can remove specific keys, or combinations of keys and modifiers (such as CTRL-C if you wanted to disable the 'copy' shortcut).

Hope this helps! If so, don't forget to vote it up and/or mark it as accepted.