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MVC3 Controller null parameter using json.stringify
public JsonResult GetById(Guid id)
{
    var results = from a in repository.AsQueryable<Department>()
                  where a.Id == id
                  orderby a.Name
                  select new { id = a.Id, name = a.Name };

    return Json(results, JsonRequestBehavior.AllowGet);
}

$(document).ready(function () {
    var o = new Object();
    o.id = 'C21803C3-1385-462E-ACEA-AFA1E554C635';

    $.getJSON('@Url.Action("GetById", "User")', JSON.stringify(o), function () {
        alert('Completed');
    });
});

$(document).ready(function () {
    $.getJSON('@Url.Action("GetById", "User")', { "id": "C21803C3-1385-462E-ACEA-AFA1E554C635" }, function () {
        alert('Completed');
    })
    .error(function (a, b, c) {
        alert(a.responseText); alert(b); alert(c);
    });
});

$(document).ready(function () {
    var o = new Object();
    o.id = 'C21803C3-1385-462E-ACEA-AFA1E554C635';

    alert(JSON.stringify(o));
});

{"id":"C21803C3-1385-462E-ACEA-AFA1E554C635"}

$(document).ready(function () {
    var o = new Object();
    o.id = 'C21803C3-1385-462E-ACEA-AFA1E554C635';

    var json_text = JSON.stringify(o, null, 2);
    alert(json_text);

    var your_object = JSON.parse(json_text);

    alert(your_object.id);
});

C21803C3-1385-462E-ACEA-AFA1E554C635

$.ajaxSetup({ cache: false });

$(document).ready(function () {
    $(".openDialog").live("click", function (e) {
        e.preventDefault();

        $("<div></div>")
                .addClass("dialog")
                .attr("id", $(this).attr("data-dialog-id"))
                .appendTo("body")
                .dialog({
                    title: $(this).attr("data-dialog-title"),
                    close: function () { $(this).remove() },
                    modal: true
                })
                .load(this.href);
    });

    $(".close").live("click", function (e) {
        e.preventDefault();
        $(this).closest(".dialog").dialog("close");
    });


    var clickableTable = $('tr[data-tr-clickable-url]');

    if (clickableTable.length > 0) {
        clickableTable.addClass('clickable')   // Add the clickable class for mouse over
            .click(function () {
                window.location.href = $(this).attr('data-tr-clickable-url');
            });

        // Remove the last child, containing anchors to actions, from each row, including the header.
        $('tr :last-child').remove();
    }
});

var o = new Object();
o.Id = 'C21803C3-1385-462E-ACEA-AFA1E554C635';

$.ajax({
    url: '@Url.Action("GetById", "User")',
    type: "POST",
    data: JSON.stringify(o),
    dataType: "json",
    contentType: "application/json; charset=utf-8",
    success: function () {
        alert('completed');
    }
});

var o = new Object();
o.Id = 'C21803C3-1385-462E-ACEA-AFA1E554C635';

$.ajax({
    url: '@Url.Action("GetById", "User")',
    data: JSON.stringify(o),
    dataType: "json",
    contentType: "application/json; charset=utf-8",
    success: function () {
        alert('completed');
    }
});

$.ajax({
  url: url,
  dataType: 'json',
  data: data,
  success: callback
});

$.getJSON('/', JSON.stringify({id:"test"}));

$.getJSON('/', {id:"test"});

public class Binder : IModelBinder
{
    #region IModelBinder Members

    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var query = controllerContext.HttpContext.Request.Url.Query;
        var json = System.Web.HttpUtility.UrlDecode(query.Remove(0,1));
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        return serializer.Deserialize(json, bindingContext.ModelType.GetType());
    }

    #endregion
}

$.getJSON('@Url.Action("GetById", "User")', JSON.stringify(o.id), function () {
    alert('Completed');
});