Get data from ajax to mvc action

Question

I want to send array of objects from ajax call to controller action.

On back-end side I have

container classes:

public class MyContainer
{
    public string Id { get; set; }
    public Filter[] Filters { get; set; }
}

public class Filter
{
    public string Name { get; set; }
    public string[] Values { get; set; }
}

and action:

public ActionResult MyAction(MyContainer container)
{
   var id = container.Id;
   foreach(Filter filter in container.Filters)
   {
       //Do something
   }
}

On front-end side I have

$(document).on('click', 'mySelector', function (event) {

    //Create first object
    var firstIds = {};
    firstIds.Name = "Custom Name 1";
    firstIds.Values = GetIds('param1'); //this return an array of strings

    //Create second object
    var secondIds = {};
    secondIds.Name = "Custome Name 2";
    secondIds.Values = GetIds('param2'); //another array

    var Id = $(this).attr('id'); //id of element

    //Add objects to array
    var filters = [];
    filters.push(firstIds);
    filters.push(secondIds);

    $.ajax({
        method: "GET",
        url: baseUrl+"/MyAction",
        //traditional: true, //I tried with and without that parameter
        data:
        {
            Id: Id,
            Filters: filters
        },
        contentType: 'application/json',
        success: function (res) {
            alert('success')
        }
    });
});

So if I use it like in example on top, container-object in action have Id value and have array of 2 elements in Filters, however both of them have Name and Values as null.

With traditional set to True, I got container.Id set but container.Filters = null.

Any suggestion? Thank you.

Answer 1

Use a POST request in combination with JSON.stringify() method.

C#

[HttpPost]
public ActionResult MyAction(MyContainer container)
{
   var id = container.Id;
   foreach(Filter filter in container.Filters)
   {
       //Do something
   }
}

JQUERY

$.ajax({
    method: "POST",
    url: baseUrl+"/MyAction",
    data:JSON.stringify(
    {
        Id: Id,
        Filters: filters
    }),
    contentType: 'application/json',
    success: function (res) {
        alert('success')
    }
});

Why do you need JSON.stringify() method ?

contentType is the type of data you're sending, so application/json; The default is application/x-www-form-urlencoded; charset=UTF-8.

If you use application/json, you have to use JSON.stringify() in order to send JSON object.

JSON.stringify() turns a javascript object to json text and stores it in a string.