private void TextBox_KeyDown(object sender, KeyEventArgs e)

        {

            #region --对输入中文就没办法屏蔽，可以在Textbox添加属性InputMethod.IsInputMethodEnabled="False"--

            //屏蔽非法按键

            if (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)

            {

                e.Handled = false;

            }

            else if (e.Key >= Key.D0 && e.Key <= Key.D9)

            {

                e.Handled = false;

            }

            else

            {

                e.Handled = true;

            }

            #endregion

        }