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json.net won't deserialize string

Posted on 2014-10-23
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1,279 Views
Last Modified: 2014-10-25
here is my class:
    public class FeedStatusResultMain
    {

        public long feedstatusid { get; set; }
        public long feedid { get; set; }
        public long clientid { get; set; }
        public string clientname { get; set; }
        public string feedname { get; set; }
        public string feeddescription { get; set; }
        public string direction { get; set; }
        public string status { get; set; }
        public string starttime { get; set; }
        public string endtime { get; set; }
        public string nextrundate { get; set; }
        public int summaryprocessed { get; set; }
        public int summaryloaded { get; set; }
        public int summaryrejected { get; set; }
        public string environment { get; set; }
    }

Here is the json response returned from my web service:
"[{
"feedstatusid":92738,
"feedid":143,
"clientid":2,
"clientname":"client1",
"feedname":"report1",
"feeddescription":"report1",
"direction":"O",
"status":"P",
"starttime":"2014-10-23 10:40:32",
"endtime":"2014-10-23 10:40:37",
"nextrundate":"2014-10-23 10:50:32",
"summaryprocessed":3,
"summaryloaded":0,
"summaryrejected":0,
"environment":""
},
{
"feedstatusid":92737,
"feedid":148,
"clientid":2,
"clientname":"client2",
"feedname":"report2",
"feeddescription":"report2",
"direction":"O",
"status":"P",
"starttime":"2014-10-23 10:40:00",
"endtime":"2014-10-23 10:40:07",
"nextrundate":"2014-10-23 10:50:00",
"summaryprocessed":2,
"summaryloaded":3,
"summaryrejected":0,
"environment":""
}]"

I try to deserialize into a list<FeedStatusResponseMain> like this:
List<FeedStatusResultMain> frx = JsonConvert.DeserializeObject<List<FeedStatusResultMain>>(rx);

it throws the following error:
System.ArgumentException: Could not cast or convert from System.String to System.Collections.Generic.List`1[TMSWebServiceClient.FeedStatusResultMain].

I am going nuts trying to find out why this error is happening.  I've tried the JArray.parse() and JObject.parse() methods, but nothing works, just errors.  I don't see anything wrong with the json and the code is right out of their documentation!
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Question by:dhenderson12
  • 2
3 Comments
 
LVL 33

Accepted Solution

by:
ste5an earned 500 total points
ID: 40399742
The problem is the first and last charachter in the JSON. These extra quotation marks create a different kind of object. Remove these two quotation marks, then it works.

namespace Samples
{
    using Newtonsoft.Json;
    using System;
    using System.Collections.Generic;
    using System.IO;

    public class Sample
    {
        public static void Main(string[] args)
        {
            using (StreamReader sr = new StreamReader(@"C:\Temp\json.txt"))
            {
                string json = sr.ReadToEnd();                
                List<FeedStatusResultMain> elements = JsonConvert.DeserializeObject<List<FeedStatusResultMain>>(json);
                foreach (FeedStatusResultMain element in elements )
                {
                      Console.WriteLine(element.ToString());
                }
            }
            
            Console.ReadLine();
        }
    }

    public class FeedStatusResultMain
    {
        public long feedstatusid { get; set; }
        public long feedid { get; set; }
        public long clientid { get; set; }
        public string clientname { get; set; }
        public string feedname { get; set; }
        public string feeddescription { get; set; }
        public string direction { get; set; }
        public string status { get; set; }
        public string starttime { get; set; }
        public string endtime { get; set; }
        public string nextrundate { get; set; }
        public int summaryprocessed { get; set; }
        public int summaryloaded { get; set; }
        public int summaryrejected { get; set; }
        public string environment { get; set; }

        public override string ToString()
        {
            return this.feedname;
        }
    }
}

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Author Comment

by:dhenderson12
ID: 40399938
OK!!  I also had to strip out the \ characters from the string ... is there a way to filter these out of the returned json string?  those are the \" double quote escape sequences.
0
 
LVL 33

Expert Comment

by:ste5an
ID: 40400308
There shouldn't be a need to do this. I would use Fiddler to control what is really sent to you. Those quotes may be from the  VS  debugger.
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