C# WinForm 中进行UrlEncode

        public static string ToUrlEncode(string strCode)
        {
            StringBuilder sb = new StringBuilder();
            byte[] byStr = Encoding.UTF8.GetBytes(strCode);
            Regex regKey = new Regex("^[A-Za-z0-9]+$");
            for (int i = ; i < byStr.Length; i++)
            {
                string strBy = Convert.ToChar(byStr[i]).ToString(CultureInfo.InvariantCulture);
                if (regKey.IsMatch(strBy))
                {
                    //是字母或者数字则不进行转换
                    sb.Append(strBy);
                }
                else
                {
                    sb.Append(@"" + Convert.ToString(byStr[i], ).ToUpper());
                }
            }
            return (sb.ToString());
        }