Jsonconvert.deserialize to class returns null

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1.00/5 (1 vote)

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Why does jsoncovert deserialization return null?

string strjson = "{\"testinfo\":" +                          "[{\"testid\":1,\"testshortdescription\":\"tanktest\",\"testlongdescription\":\"Tank Test \",\"testtypeid\":2,\"testlimitsid\":null}," +                            "{\"testid\":2,\"testshortdescription\":\"FuelPump1\",\"testlongdescription\":\"Fuel Pump 1\",\"testtypeid\":4,\"testlimitsid\":null}," +                            "{\"testid\":3,\"testshortdescription\":\"FuelPump2\",\"testlongdescription\":\"Fuel Pump 2\",\"testtypeid\":4,\"testlimitsid\":null}," +                          "{\"testid\":4,\"testshortdescription\":\"TankAudit\",\"testlongdescription\":\"Tank Chamber Audit\",\"testtypeid\":6,\"testlimitsid\":null}]}";

TestInfoCollectionCS testinfocollections = JsonConvert.DeserializeObject<TestInfoCollectionCS>(strjson);

Here is the TestCS class:

using System;
using System.Collections.Generic;
using System.Text;
namespace TestITMobileApp.Models
{
    public class TestCS
    {
        #region "Private variables""
        private int TestID;
        private string TestShortDescription;
        private string TestLongDescription;
        private int? TestTypeID;
        private int? TestLimitsID;
        #endregion
        #region "Properties"
        #region "testid"
        public int testid { get => TestID; set => TestID = value; }
        #endregion
        #region "testshortdescription"
        public string testshortdescription { get => TestShortDescription; set => TestShortDescription = value; }
        #endregion
        #region "testlongdescription"
        public string testlongdescription { get => TestLongDescription; set => TestLongDescription = value; }
        #endregion
        #region "testtypeid"
        public int? testtypeid { get => TestTypeID; set => TestTypeID = value; }
        #endregion
        #region "testlimitsid"
        public int? testlimitsid { get => TestLimitsID; set => TestLimitsID = value; }
        #endregion
        #endregion
    }
}

The class TestInfoCollectionCS that contains the list class:

using System;
using System.Collections.Generic;
using System.Text;
using TestITMobileApp.Model;
using TestITMobileApp.Models;

namespace TestITMobileApp.App_Data
{
    public class TestInfoCollectionCS
    {
        private List<TestCS> testinfocollection;

        public List<TestCS> TestInfoCollection { get => testinfocollection; set => testinfocollection = value; }
    }
}

What I have tried:

Deserialization returning null?

Posted 13-Feb-19 6:57am

Paul Dietz

Updated 13-Feb-19 8:11am

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Comments

Richard Deeming 14-Feb-19 10:50am

REPOST
You have already posted this:
https://www.codeproject.com/Questions/1277138/Jsonconvert-deserialize-to-class-returns-null[^]

1 solution

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OriginalGriff · Answer 1 · 2019-02-13T08:11:00

Probably, your class names don't match.
If I feed your JSON into a class generator (json2csharp - generate c# classes from json[^]) I get these:

public class Testinfo
    {
    public int testid { get; set; }
    public string testshortdescription { get; set; }
    public string testlongdescription { get; set; }
    public int testtypeid { get; set; }
    public object testlimitsid { get; set; }
    }

public class RootObject
    {
    public List<Testinfo> testinfo { get; set; }
    }

Instead of TestCS.

If I try with those classes, it deserializes fine as a single instance in the list:

string strjson = "{\"testinfo\":" + "[{\"testid\":1,\"testshortdescription\":\"tanktest\",\"testlongdescription\":\"Tank Test \",\"testtypeid\":2,\"testlimitsid\":null}," + "{\"testid\":2,\"testshortdescription\":\"FuelPump1\",\"testlongdescription\":\"Fuel Pump 1\",\"testtypeid\":4,\"testlimitsid\":null}," + "{\"testid\":3,\"testshortdescription\":\"FuelPump2\",\"testlongdescription\":\"Fuel Pump 2\",\"testtypeid\":4,\"testlimitsid\":null}," + "{\"testid\":4,\"testshortdescription\":\"TankAudit\",\"testlongdescription\":\"Tank Chamber Audit\",\"testtypeid\":6,\"testlimitsid\":null}]}";
Console.WriteLine("{0}", strjson);
RootObject x = Newtonsoft.Json.JsonConvert.DeserializeObject<RootObject>(strjson);
Testinfo ti = x.testinfo[0];