Getting NULL Deserializing JSON string using JavaScriptSerializer

Question

Hi I having following JSON but while Using Deserialize method getting NULL in nested Member here is the sample JSON and corresponding Class object:

{
   "status": "success",
    "Info": [
      {
       "Name": "1099589",
       "version": "Current Version",
       "MoreDetails": [
        {

          "Name": "1099589",
          "state": "IN"

        },
        {
          "Name": "1099768",
          "state": "OUT"

        }

      ]
    },
    {
      "Name": "1099768",
      "version": "2019"
    }
  ],
  "errorCode": "",
  "message": ""
}

Class :

  public class MoreDetail
    {
        public string Name { get; set; }
        public string state { get; set; }
    }

    public class Info
    {
        public string Name { get; set; }
        public string version { get; set; }
        public IList<MoreDetail> MoreDetails { get; set; }
    }

    public class Example
    {
        public string status { get; set; }
        public IList<Info> Info { get; set; }
        public string errorCode { get; set; }
        public string message { get; set; }
    }

While I am using

JavaScriptSerializer js = new JavaScriptSerializer();
Example ex = new OfferingPayload();
ex = js.Deserialize<Example> (jsonstring);

I am able to see Example object having Info data as list but MoreDetails member of Info Class is coming NULL.

Can someone suggest what I am missing here ?

your JSON is invalid. you have two trailing commas: "state": "IN", and "state": "OUT", - next time, validate your data first, for example with jsonlint.com — Franz Gleichmann
– Franz Gleichmann, Commented May 10, 2020 at 13:15
quicktype.io/csharp, Edit-Paste Special-Paste Json as Classes in Visual Studio — Pavel Anikhouski
– Pavel Anikhouski, Commented May 10, 2020 at 13:36

Alexander Danilov · Accepted Answer · 2020-05-10 13:49:04Z

3

Thats because your second "Info" object doesnt have "MoreDetails" property.

{
  "Name": "1099768",
  "version": "2019"
}

To make it works you can add an empty "MoreDetails" property to your json.

{
  "Name": "1099768",
  "version": "2019",
  "MoreDetails": []
}

Or you can configure your serializer to handle this property as optional. Then it will works fine even if it missing in your json.

edited May 10, 2020 at 13:49

answered May 10, 2020 at 13:34

Alexander Danilov

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3 Comments

prag Over a year ago

Created similar JSON string with "MoreDetails" :[ ] empty option , But Still I see NULL .

Alexander Danilov Over a year ago

I pasted code that I use to check it - https://www.paste.org/105177. It works fine. I use .Net Framework 4.7.2 and JavascriptSerializer from System.Web.Script.Serialization namespace. Maybe you take some errors in your json, or maybe you have configuration for your serializer somewhere that limits max json depth

prag Over a year ago

Thnx ! Without empty "MoreDeatils [] it just worked , Everything was fine still I didn't see any issue what I did just re-generated the CLASSES Again , it worked .,

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