C#： TextBox文本框輸入十六進制數值的處理

十六進制數值的輸入控制（KeyPress事件）：

        private void textBox_hex_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            //e.Handled = e.KeyChar < '0' || e.KeyChar > '9';  //允許輸入數字
            e.Handled = !((e.KeyChar >= '0' && e.KeyChar <= '9') || (e.KeyChar >= 'a' && e.KeyChar <= 'f') || (e.KeyChar >= 'A' && e.KeyChar <= 'F'));
            if (e.KeyChar == (char)8)  //允許輸入回退鍵
            {
                e.Handled = false;
            }
            if (e.KeyChar == 'x')  //允許輸入‘x’
            {
                e.Handled = false;
            }
            if (e.KeyChar == 'X')  //允許輸入'X'
            {
                e.Handled = false;
            }
        }

數值的轉換：public static int StringToHexOrDec(string strData)

        public static int StringToHexOrDec(string strData)
        {
            int dData = -1;
            try
            {
                if ((strData.Length > 2))
                {
                    if ((strData.Substring(0, 2).Equals("0x")) || (strData.Substring(0, 2).Equals("0X")))
                    {
                        string str_sub = strData.Substring(2, strData.Length - 2);
                        dData = int.Parse(str_sub, System.Globalization.NumberStyles.HexNumber);
                    }
                    else
                    {
                        dData = int.Parse(strData, System.Globalization.NumberStyles.Integer);
                    }
                }
                else
                {
                    dData = int.Parse(strData, System.Globalization.NumberStyles.Integer);
                }
            }
            catch (Exception)
            {
                //MessageBox.Show("輸入錯誤: " + strData, "錯誤");
            }
            return dData;
        }