JSON DeserializeObject Error converting value

Question

I am getting 'Error converting value' when I try to use deserilizeobject. My client sometimes sends data with quotes and special characters in it. It works when they try to serialize it. But it doesn't work when I try to deserilize it. I tried with escapehtml but still I have the same issue. It looks like 'SerializeObject' is not throwing error message that means it's valid JSON. Please let me know how to solve this issue.

string json2 = @"{
  'RootObject1':{
     't_date': '03-JAN-2016',
     't_summary': 'test """"""""""""'
   }
}";


var json3 = JsonConvert.SerializeObject(json2,  Newtonsoft.Json.Formatting.None,  new Newtonsoft.Json.JsonSerializerSettings{ StringEscapeHandling = Newtonsoft.Json.StringEscapeHandling.EscapeHtml });

var myJsonObject = JsonConvert.DeserializeObject<RootObject1>(json3);

class RootObject1
{
    public string t_date { get; set; }
    public string t_summary { get; set; }
}

You're serializing a string into json3, so that's not going to deserialize to an object, only a string. — Heretic Monkey
– Heretic Monkey, Commented Jul 18, 2017 at 15:41
It works when I remove 'test """"""""""""' double quotes in the string. What is proper way to do this? — nav100
– nav100, Commented Jul 18, 2017 at 15:44
Correct me if I'm wrong, but json2 is just a string, if you want a string as a json object, you have to parse() it first, then you can use it as a json object, and deserialize() it into a .net object — Adam Vincent
– Adam Vincent, Commented Jul 18, 2017 at 16:07

Samvel Petrosov · Accepted Answer · 2017-07-18 16:15:57Z

This is not the correct way how you should use JsonConvert.Serialize and Deserialize.
At the beginning you should Serialize the object to string and then Deserialize back from string to object. Here is example of that:

RootObject1 ro = new RootObject1();
ro.t_date = "03-JAN-2016";
ro.t_summary = @"test """"""""""""";
var json3 = JsonConvert.SerializeObject(ro, typeof(RootObject1), Newtonsoft.Json.Formatting.None, new Newtonsoft.Json.JsonSerializerSettings { StringEscapeHandling = Newtonsoft.Json.StringEscapeHandling.EscapeHtml });
var myJsonObject = JsonConvert.DeserializeObject<RootObject1>(json3);
Console.WriteLine(myJsonObject.t_date + "\t" + myJsonObject.t_summary);

When you are trying to Serialize string then it will be Deserialze to string also. And it has no meaning at some point to do that.

Also if you want to get the object from JSON string you should do Deserealization and your JSON string is not valid. Here is example how you can achieve that:

string json2 = @"{
        't_date': '03-JAN-2016',
        't_summary': 'test """"""""""""'
    }";
var obj = JsonConvert.DeserializeObject<RootObject1>(json2);
Console.WriteLine(obj.t_date + "\t" + obj.t_summary);

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