Json string list is coming with empty

Question

am passing a json string collection from Android device to .net MVC HttpPost method. my json string is like.

{"collection",[{"Name":"A","Age":"12","Class":"10"},{"Name":"B","Age":"12","Class":"10"}]}

My MVC control function is:

  [HttpPost]
    public ActionResult Create(string[] collection)
    {
        try
        {
            // TODO: Add insert logic here
            JavaScriptSerializer json_serializer = new JavaScriptSerializer();
            List<Model.StudentBehaviour> stdbehaviour_list = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Model.StudentBehaviour>>(collection);
            Lib.StudentModule.StudentManager.InsertStudentBehaviours(stdbehaviour_list);               
            return Json("success", JsonRequestBehavior.AllowGet);
        }
        catch
        {
            return Json("exception", JsonRequestBehavior.AllowGet);
        }
    }

the function parameter value is

collection = "(Collection)"

expected value in collection is

collection[0] 
Name = A 
Age = 12
Class = 10
collection[1] 
Name = B 
Age = 12
Class = 10

please help to fix this issue

Thanks in advance

Answer 1

ASP.NET MVC has the concept of ModelBinding. This means that if you add parameters to an Action method, MVC will try to fill these with the data you send.

This means you can change your code to:

 // Example of your Student class. 
 // Make sure that all properties you want to bind to are public
 public class Student
 {
     public string Name { get; set; }
     public int Age { get; set; }
     public int Class { get; set; }
 }

// Example of an Action method. Note that instead of taking a string as parameter,
// you just accept a collection of Student objects.
[HttpPost]
public JsonResult Create(List<Student> collection)
{
    if (ModelState.IsValid)
    {
        return Json("success", JsonRequestBehavior.AllowGet);
    }
    else
    {
        return Json("exception", JsonRequestBehavior.AllowGet);
    }
}

You can then use the following jquery to post your data:

function sendData() {    
        var data = [{ 'Name': 'A', 'Age': '12', 'Class': '10' },
            { 'Name': 'B', 'Age': '12', 'Class': '10' }];

        var collection = JSON.stringify(data);

        $.ajax({
            url: "Home/Create",
            type: "POST",
            data: collection,
            dataType: 'json',
            contentType: 'application/json; charset=utf-8',
        }).done(function (msg) {
            alert("Data Saved: " + msg);
        });
    }