JsonConvert.SerializeObject in Asp.Net MVC

Question

Im retrieving data in database using ajax but when I'm calling the method in controller I getting an error in JsonConvert.SerializeObject(model, Formatting.Indented, new JsonSerializerSettings and I don't know why. Here's my code:

Views

function EditRecord(Id) {
    var url = "/Admin/GetCategoryGroupById?Id=" + Id;
    $("#ModalTitle").html("Update Category Group");
    $("#MyModal").modal();
    $.ajax({
        type: "GET",
        url: url,
        success: function (data) {
            var obj = JSON.parse(data);
            $("#Id").val(obj.Id);
            $("#Name").val(obj.Name);
            //$("#Status option:selected").text(obj.tblDepartment.DepartmentName);
            $("#cbStatus").val(obj.Status);
        }, error: function (xhr, status, error) {
            alert(error);
        }
    })
}

Controllers

    public JsonResult GetCategoryGroupById(int Id)
    {
        CategoryGroup model = db.CategoryGroups.Where(x => x.Id == Id).SingleOrDefault();
        string value = string.Empty;
        value = JsonConvert.SerializeObject(model, Formatting.Indented, new JsonSerializerSettings
        {
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
        });
        return Json(value, JsonRequestBehavior.AllowGet);
    }

The error:

Please help me. Thank you.

Ali Al-Omairi · Accepted Answer · 2021-06-09 10:52:40Z

1

i think that your db doesn't have any CategoryGroups with the specified id. this is why the singleOrDefault returns null. so you need to add an if statement to check weather model is null

answered Jun 9, 2021 at 10:52

Ali Al-Omairi

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