WinForm 限制TextBox只能输入数字和小数点

 /// <summary>

        /// 限制TextBox只能输入数字和小数点

        /// 一般在TextBox的KeyPress中调用

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        public static void TextBox_KeyPress(object sender, KeyPressEventArgs e)

        {

            if (!(((e.KeyChar >= '0') && (e.KeyChar <= '9')) || e.KeyChar <= 31))

            {

                if (e.KeyChar == '.')

                {

                    if (((TextBox)sender).Text.Trim().IndexOf('.') > -1)

                        e.Handled = true;

                }

                else

                    e.Handled = true;

            }

            else

            {

                if (e.KeyChar <= 31)

                {

                    e.Handled = false;

                }

            }

        }