C# web API POST JSON data using POSTMAN client results in always NULL in FromBody

Question

I am having a Web Api containing Model -

 public class Assessments
{
    public List<AssessmentResult> Results { get; set; }
}

public class AssessmentResult
{
    public int? AssessorId { get; set; }
    public int? AssessmentId { get; set; }
    public int? CentreId { get; set; }
    public int? BatchId { get; set; }
    public DateTime AssessmentDate { get; set; }

And Controller -

[HttpPost]
    [ActionName("SetAssessmentResults")]
    public HttpResponseMessage SetAssessmentResults([FromBody] Assessments assessments)
    {
        try
        {

            string sproc = ConfigurationManager.AppSettings["ASSESSORAPP_InsertAssessmentsStaging"];
            //_dt = Helper.ToDataTable(assessments); use this if sending list doesnt work

            Mapper.Initialize(cfg =>
            {
                //cfg.CreateMissingTypeMaps = false;
                cfg.CreateMap<AssessmentResult, AssessmentTable>().IgnoreAllNonExisting();

                //cfg.IgnoreUnmapped();
            });
            List<AssessmentTable> assessmentTable = Mapper.Map<List<AssessmentResult>, List<AssessmentTable>>(assessments.Results);
            Mapper.Configuration.AssertConfigurationIsValid();

            string isSuccess = _db.InsertAssessmentResults(sproc, assessmentTable);
            if (isSuccess.Split('$')[0].ToLower() == "success")
            {
                return Request.CreateResponse(HttpStatusCode.OK, isSuccess);
            }
            else if (isSuccess.Split('$')[0].ToLower() == "duplicate")
            {
                return Request.CreateResponse(HttpStatusCode.OK, isSuccess);
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.OK, isSuccess);
            }
        }
        catch (Exception ex)
        {
            return Request.CreateResponse(HttpStatusCode.InternalServerError, ex);
        }
    }

Client side, I am using Postman Chrome extension. I am sending POST request with JSON data in body. However, I am not getting the JSON data in controller (assessments object always shows NULL value)

assessments object showing NULL value

In client side, I am request using PostMan Chrome extension

PostMan Client sending request

This is my JSON data :

    {
"assessment":
[{
      "AssessorId": 3,
      "AssessmentId": 123,
      "CentreId": 1,
      "BatchId": null,
      "AssessmentDate": "2016-09-30T00:00:00",

    },{
     "AssessorId": 2,
      "AssessmentId": 123,
      "CentreId": 1,
      "BatchId": null,
      "AssessmentDate": "2016-09-30T00:00:00",
    }]
    }

I have also added Content-Type : application/json

Please help me to solve this problem. Thank you !

Make sure the name of your properties in JSON are identical to your C# model class. — Fabricio Koch
– Fabricio Koch, Commented Sep 28, 2016 at 13:19

Luis Palacios · Accepted Answer · 2016-09-28 13:26:03Z

In your class Assessments you name the property that contains the list of AssessmentResult "Results" but when you send the post you are naming the property "assessment" it should be "Results" (considering you have the default serializer configuration eg: no propertie name to lower camel case when serializing)

Try:

  {
     "Results":[{
                 "AssessorId": 3,
                 "AssessmentId": 123,
                 "CentreId": 1,
                 "BatchId": null,
                 "AssessmentDate": "2016-09-30T00:00:00",

               },
               {
                 "AssessorId": 2,
                 "AssessmentId": 123,
                 "CentreId": 1,
                 "BatchId": null,
                 "AssessmentDate": "2016-09-30T00:00:00",
               }]
 }

Also as a good practice you should instance the list in the constructor of your class Eg:

public class Assessments
{
    public Assessments()
    {
         Results = new List<AssessmentResult>();
    }
    public List<AssessmentResult> Results { get; set; }
}

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