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; }