Parse complex JSON string to read values in C#

Question

I am trying to read below JSON string in C#

    {
  "ModelState": {
    "obj.SystematicDate": {
      "_errors": [
        {
          "<Exception>k__BackingField": null,
          "<ErrorMessage>k__BackingField": "A value is required."
        }
      ],
      "<Value>k__BackingField": null
    },
    "obj.CustomerId": {
      "_errors": [
        {
          "<Exception>k__BackingField": null,
          "<ErrorMessage>k__BackingField": "A value is required."
        }
      ],
      "<Value>k__BackingField": null
    },
    "obj.userId": {
      "_errors": [
        {
          "<Exception>k__BackingField": null,
          "<ErrorMessage>k__BackingField": "User Id is mandatory"
        }
      ],
      "<Value>k__BackingField": null
    }
  }
}

The above mentioned JSON string is response from an api call and it is dynamic. It can contain n number of 'obj.' properties.

I need to read that values and show error message as SystematicDate: A value is required , userId: User Id is mandatory and so on.

I tried below solutions but did not get the desired output.

var jsonStrin = "{'ModelState':{'obj.SystematicDate':{'_errors':[{' < Exception > k__BackingField':null,' < ErrorMessage > k__BackingField':'A value is required.'}],' < Value > k__BackingField':null},'obj.CustomerId':{'_errors':[{' < Exception > k__BackingField':null,' < ErrorMessage > k__BackingField':'A value is required.'}],' < Value > k__BackingField':null},'obj.userId':{'_errors':[{' < Exception > k__BackingField':null,' < ErrorMessage > k__BackingField':'User Id is mandatory'}],' < Value > k__BackingField':null}}}";
//var stuff=JsonConvert.DeserializeObject(jsonStrin);
//JObject o = JObject.Parse(jsonStrin);
var example1Model = new JavaScriptSerializer().Deserialize<ModelState>(jsonStrin);


public class ModelState {
    public List<SystematicDateError> SystematicDate { get; set; }
    public List<CustomerIdError> CustomerId { get; set; }
}

public class SystematicDateError
{
    public List<string> _errors { get; set; }
}

public class CustomerIdError
{
    public List<string> _errors { get; set; }
}

Please help me with this. Thanks in advance.

You're trying to deserialize to ModelState, but ModelState isn't the root object in your JSON. You need a containing object. — ProgrammingLlama
– ProgrammingLlama, Commented Dec 21, 2017 at 5:17
@john Thanks for your prompt response. I do not have control over json response i can not modify it. I need to read it the way it is. — Vaibhav Gole
– Vaibhav Gole, Commented Dec 21, 2017 at 5:33

Emre Kabaoglu · Accepted Answer · 2017-12-21 05:32:56Z

2

Your model classes are wrong. I modified them like this;

public class Root
{
    public ModelState ModelState { get; set; }
}

public class ModelState
{
    [JsonProperty("obj.SystematicDate")]//You should specify the obj. properties here
    public Obj SystematicDate { get; set; }
    [JsonProperty("obj.CustomerId")]
    public Obj CustomerId { get; set; }
    [JsonProperty("obj.userId")]
    public Obj UserId { get; set; }
}

public class ObjError
{
    public string k__BackingField { get; set; }

    public string k__BackingField2 { get; set; }
}
public class Obj
{
    public List<ObjError> _errors { get; set; }

    public string state { get; set; }
}

Then just deserialize it like this;

var jsonStrin = "{'ModelState':{'obj.SystematicDate':{'_errors':[{' < Exception > k__BackingField':null,' < ErrorMessage > k__BackingField':'A value is required.'}],' < Value > k__BackingField':null},'obj.CustomerId':{'_errors':[{' < Exception > k__BackingField':null,' < ErrorMessage > k__BackingField':'A value is required.'}],' < Value > k__BackingField':null},'obj.userId':{'_errors':[{' < Exception > k__BackingField':null,' < ErrorMessage > k__BackingField':'User Id is mandatory'}],' < Value > k__BackingField':null}}}";
var stuff=JsonConvert.DeserializeObject<Root>(jsonStrin);

answered Dec 21, 2017 at 5:32

Emre Kabaoglu

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1 Comment

Vaibhav Gole Over a year ago

Thank you so much it worked as expected. Only i need to change the ObjError class just added [JsonProperty(" < Exception > k__BackingField")] and [JsonProperty(" < ErrorMessage > k__BackingField")] and it worked.

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