ASP.NET MVC Controller - 500Error

Question

Why isn't my controller function called? I always get 500error (in fiddler). I get no error in Visual Studio or an error site.

Controller:

[POST("/test1")]  // attributerouting (works with GET methods)
public ActionResult test1(TreeViewItemModel aItem)
{
  ...
}

Client:

var tree = $("#demo2").jstree("get_json");
var c = JSON.stringify(tree);
$.ajax({
        type: "POST",
        url: "/test1",
        data: tree,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (response) {
            alert(response);
        }
    });

Answer 1

problem was the data format: solution:

public ActionResult test1(IEnumerable<TreeViewItemModel> aItem)
{
}

Client:

var tree = $("#demo2").jstree("get_json");
var c = JSON.stringify(tree);
 $.ajax({
    type: "POST",
    url: "/test1",
    data: c,
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (response) {
        alert(response);
    }
});