有没有一种方法可以验证C＃中的字符串是否为JSON格式？

Question

I tried using code I found in this answer :-

        strInput = strInput.Trim();
        if ((strInput.StartsWith("{") && strInput.EndsWith("}")) || //For object
            (strInput.StartsWith("[") && strInput.EndsWith("]"))) //For array
        {
            try
            {
                var obj = JToken.Parse(strInput);
                return true;
            }
            catch (JsonReaderException jex)
            {
                //Exception in parsing json
                Console.WriteLine(jex.Message);
                return false;
            }
            catch (Exception ex) //some other exception
            {
                Console.WriteLine(ex.ToString());
                return false;
            }
        }
        else
        {
            return false;
        }

Problem with this code is, that it validates wrong JSON Files as right, because JToken.Parse automatically deletes Elements that are doubled in the sequence for example:

{
   "Body" : {
      "Data" : {}
   },
   "Head" : {
      "RequestArguments" : {
         "Scope" : ""
      },
      "Status" : {
         "Code" : 255,
         "Reason" : "CGI-Args: Invalid parameter '' for Scope.",
         "UserMessage" : ""
      },
      "Timestamp" : "2017-01-24T13:15:33+01:00"
   },
   "Head" : {
      "RequestArguments" : {
         "Scope" : ""
      },
      "Status" : {
         "Code" : 255,
         "Reason" : "CGI-Args: Invalid parameter '' for Scope.",
         "UserMessage" : ""
      },
      "Timestamp" : "2017-01-24T13:15:33+01:00"
   }
}

Here there are 2 Head Token on the same Level which are not allowed, but JToken automatically parses away one of the 2 Head Tokens so the resulting Object is valid

Answer 1

You can modify this code to check elements from JToken.Parse() result. If values are duplicated you can return false