base64解密方法

        /// 
        /// base64解密
        /// 
        /// 编码方式
        /// 加密源字符串
        /// 
        private string DecodeBase64(Encoding encode, string result)
        {
            string decode = "";
            byte[] bytes = Convert.FromBase64String(result);
            try
            {
                decode = encode.GetString(bytes);
            }
            catch
            {
                decode = result;
            }
            return decode;
        }