Passing Parameters to Action is not passing all data.

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C#

Ajax

MVC

jQuery

Hi Guys,

I have the following action on a controller:

[HttpPost]
public ActionResult SaveSubmission(SubmissionModel submission, SubmissionStateEnum submissionState)
{
    if (Request.IsAjaxRequest())
    {
        return Json(true, JsonRequestBehavior.AllowGet);
    }
    return RedirectToAction("Index");
}

The submission model looks as follows:

[Serializable]
public class SubmissionModel
{
    public string TestString { get; set; }
    public SubmissionDetailsModel Details { get; set; }
    public SubmissionIncomeStatement IncomeStatement { get; set; }
    public SubmissionSubcontractorModel SubcontractorDetails { get; set; }

    public SubmissionModel()
    {
        TestString = "NEW";
        Details = new SubmissionDetailsModel();
        IncomeStatement = new SubmissionIncomeStatement();
        SubcontractorDetails = new SubmissionSubcontractorModel();
    }
}

On my page, I have this function to submit the data:

function SaveSubmission() {
           
            var sd = { MarketId: 2, SubmissionDate: $('#submissionDate').attr('data-date') };
            
            var so = {
                TestString: 'fromPage',
                Details: sd,
                IncomeStatement: null,
                SubcontractorDetails: null
            };

            $.ajax({
                type: "POST",
                url: '@Url.Action("SaveSubmission")',
                data: { submission: JSON.stringify(so), submissionState: '@SubmissionStateEnum.Rejected' },
                dataType: "json",
                success: function (data) {
                    alert(data);
                },
                error: function (jqXHR, textStatus, errorThrown) {
                    alert(jqXHR);
                    alert(textStatus);
                    alert(errorThrown);
                }
            });

        }

The problem I am having is that when the action gets called from the ajax the "submission" parameter is null, however if I look at the request I can see it has passed the data back.
So my question is why is it not mapping to my object on the action? I've tried serialisation and I cannot seem to get it to work? I might be missing something very obvious but I have no idea what it is.

If you need more info, please ask.

Thanks in advance.