WPF TextBox只允许输入数字

添加KeyDown事件

private void TextBox_KeyDown(object sender, KeyEventArgs e)        {            if (e.Key >= Key.D0 && e.Key <= Key.D9 || e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)            {                e.Handled = false;            }            else e.Handled = true;        }