数値入力に必要なキー以外を無効化する

gistfile1.cs

private void KeyPressNumberOnly(Object sender, KeyEventArgs e)
{
    if ((e.Key < Key.D0 || e.Key > Key.D9) &&
        (e.Key < Key.NumPad0 || e.Key > Key.NumPad9) &&
        e.Key != Key.Back &&
        e.Key != Key.Delete &&
        e.Key != Key.Left &&
        e.Key != Key.Right &&
        e.Key != Key.Tab)
    {
        e.Handled = true;
    }
    
}