Unable to receive json data in controller with knockout - ajax

Question

I am new with knockout and mvc, so I need some help, my question is
my dropdown list is populating successfully from server, and on clicking save button calls Save method in controller. But problem is that in controller I am unable to receive json data i.e it is null. here is my code in view
var initialData = #Html.Raw( new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(Model));
var viewModel = function(){
var self = this;
self.HomeAgencies = ko.observableArray(initialData.HomeAgencies);
self.selectedOrgUnit = ko.observable();
self.Save = function () {
$.ajax({
url: "#Url.Action("Save")",
type: "POST",
data: ko.toJSON(this),
contentType: "application/json; charset=utf-8",
dataType:"json",
success: function(result) {alert(result.message)}
});
}
}
var vm = new viewModel();
ko.applyBindings(vm);
Where in controller i have following code
public JsonResult Save(string someData)
{
var message = string.Format("Saved {0} ", "successfully");
return Json(new { message });
}
string someData is always null, where I am expecting some json data.

Answer 1

Try to replace this to self in data and introduce field name and remove contentType.
$.ajax({
url: '#Url.Action("Save")',
type: 'POST',
data: { someData: ko.toJSON(self) },
dataType: 'json',
success: function (result) { alert(result.message); }
});
In your case context of the method can be changed from your object to html element that invoked them method or to window.

Answer 2

issue resolved. Problem was at controller side, in Action of controller pass the same model class instead parsing json manually.