How to create a numeric textbox in Silverlight?

Question

As the title says really. I've had a look at inheriting from TextBox, but the only sensible override was "OnKeyDown", but that just gives me a key from the Key enum (with no way to use Char.IsNumeric()).

Answer 1

Take a look at NumericUpDown in the Toolkit http://codeplex.com/Silverlight and maybe you can use that or look at the source to implement your own numeric textbox.

Answer 2

Take a look at this one, it uses an attached property over the textbox. I am using it and it does work. http://weblogs.asp.net/manishdalal/archive/2008/09/24/prevention-the-first-line-of-defense-with-attach-property-pixie-dust.aspx

Answer 3

private void Numclient_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key < Key.D0 || e.Key > Key.D9)
    {
        if (e.Key < Key.NumPad0 || e.Key > Key.NumPad9)
        {
            if (e.Key != Key.Back && e.Key != Key.Shift)
            {
                e.Handled = true;
            }
        }
    }
}