Passing A List Of Objects Into An MVC Controller M

Question

I'm trying to pass an array of objects into an MVC controller method using jQuery's ajax() function. When I get into the PassThing() C# controller method, the argument "things" is null. I've tried this using a type of List for the argument, but that doesn't work either. What am I doing wrong?

<script type="text/javascript">
    $(document).ready(function () {
        var things = [
            { id: 1, color: 'yellow' },
            { id: 2, color: 'blue' },
            { id: 3, color: 'red' }
        ];

        $.ajax({
            contentType: 'application/json; charset=utf-8',
            dataType: 'json',
            type: 'POST',
            url: '/Xhr/ThingController/PassThing',
            data: JSON.stringify(things)
        });
    });
</script>

public class ThingController : Controller
{
    public void PassThing(Thing[] things)
    {
        // do stuff with things here...
    }

    public class Thing
    {
        public int id { get; set; }
        public string color { get; set; }
    }
}

Answer 1

Wrapping your list of objects with another object containing a property that matches the name of the parameter which is expected by the MVC controller works. The important bit being the wrapper around the object list.

$(document).ready(function () {
    var employeeList = [
        { id: 1, name: 'Bob' },
        { id: 2, name: 'John' },
        { id: 3, name: 'Tom' }
    ];      

    var Employees = {
      EmployeeList: employeeList
    }

    $.ajax({
        dataType: 'json',
        type: 'POST',
        url: '/Employees/Process',
        data: Employees,
        success: function () {          
            $('#InfoPanel').html('It worked!');
        },
        failure: function (response) {          
            $('#InfoPanel').html(response);
        }
    }); 
});


public void Process(List<Employee> EmployeeList)
{
    var emps = EmployeeList;
}

public class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
}

Answer 2

Using NickW's suggestion, I was able to get this working using things = JSON.stringify({ 'things': things }); Here is the complete code.

$(document).ready(function () {
    var things = [
        { id: 1, color: 'yellow' },
        { id: 2, color: 'blue' },
        { id: 3, color: 'red' }
    ];      

    things = JSON.stringify({ 'things': things });

    $.ajax({
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        type: 'POST',
        url: '/Home/PassThings',
        data: things,
        success: function () {          
            $('#result').html('"PassThings()" successfully called.');
        },
        failure: function (response) {          
            $('#result').html(response);
        }
    }); 
});


public void PassThings(List<Thing> things)
{
    var t = things;
}

public class Thing
{
    public int Id { get; set; }
    public string Color { get; set; }
}

There are two things I learned from this:

1. The contentType and dataType settings are absolutely necessary in the ajax() function. It won't work if they are missing. I found this out after much trial and error.

2. To pass in an array of objects to an MVC controller method, simply use the JSON.stringify({ 'things': things }) format.

I hope this helps someone else!

Answer 3

Modification from @veeresh i

 var data=[

                        { id: 1, color: 'yellow' },
                        { id: 2, color: 'blue' },
                        { id: 3, color: 'red' }
                        ]; //parameter
        var para={};
        para.datav=data;   //datav from View


        $.ajax({
                    traditional: true,
                    url: "/Conroller/MethodTest",
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    data:para,
                    success: function (data) {
                        $scope.DisplayError(data.requestStatus);
                    }
                });

In MVC



public class Thing
    {
        public int id { get; set; }
        public string color { get; set; }
    }

    public JsonResult MethodTest(IEnumerable<Thing> datav)
        {
       //now  datav is having all your values
      }

Answer 4

If you are using ASP.NET Web API then you should just pass data: JSON.stringify(things).

And your controller should look something like this:

public class PassThingsController : ApiController
{
    public HttpResponseMessage Post(List<Thing> things)
    {
        // code
    }
}

Answer 5

     var List = @Html.Raw(Json.Encode(Model));
$.ajax({
    type: 'post',
    url: '/Controller/action',
    data:JSON.stringify({ 'item': List}),
    contentType: 'application/json; charset=utf-8',
    success: function (response) {
        //do your actions
    },
    error: function (response) {
        alert("error occured");
    }
});

Answer 6

I have perfect answer for all this : I tried so many solution not able to get finally myself able to manage , please find detail answer below:

       $.ajax({
            traditional: true,
            url: "/Conroller/MethodTest",
            type: "POST",
            contentType: "application/json; charset=utf-8",
            data:JSON.stringify( 
               [
                { id: 1, color: 'yellow' },
                { id: 2, color: 'blue' },
                { id: 3, color: 'red' }
                ]),
            success: function (data) {
                $scope.DisplayError(data.requestStatus);
            }
        });

Controler

public class Thing
{
    public int id { get; set; }
    public string color { get; set; }
}

public JsonResult MethodTest(IEnumerable<Thing> datav)
    {
   //now  datav is having all your values
  }