WPF: A TextBox that has an event that fires when the Enter Key is pressed

Question

Instead of attaching a PreviewKeyUp event with each TextBox in my app and checking if the pressed key was an Enter key and then do an action, I decided

Answer 1

Have a look at this blog post from a few months back where I attach a 'global' event handler to TextBox.GotFocus to select the text.

Essentially you can handle the KeyUp event in your App class, like this:

protected override void OnStartup(StartupEventArgs e)
{
    EventManager.RegisterClassHandler(typeof(TextBox),
        TextBox.KeyUpEvent,
        new System.Windows.Input.KeyEventHandler(TextBox_KeyUp));

    base.OnStartup(e);
}

private void TextBox_KeyUp(object sender, System.Windows.Input.KeyEventArgs e)
{
    if (e.Key != System.Windows.Input.Key.Enter) return;

    // your event handler here
    e.Handled = true;
    MessageBox.Show("Enter pressed");
}

... and now every TextBox in your application will call the TextBox_KeyUp method as users type into them.

Update

As you've pointed out in your comment, this is only useful if every TextBox needs to execute the same code.

To add an arbitrary event like an Enter keypress, you might be better off looking into Attached Events. I believe this can get you what you want.