级联下拉列表没有填充MVC

在MVC视图中设置了两个下拉列表，如下所示:

@Html.DropDownListFor(model => model.Market, 
    new SelectList(ListInfo.Markets(), "Name", "Name"), "Markets..."
    , new { @class = "form-control", @id = "MarketSelect" })
<select id="StationSelect" name="SelectedStations" class="chosen-select form-control" multiple></select>

表单以:

@using (Html.BeginForm("CreateEvent", "Event", FormMethod.Post, new { role =   "form", id = "EventForm", data_stationListAction = @Url.Action("StationList") }))

下面的脚本在视图的底部被调用:

<script src="@Url.Content("~/Scripts/marketStation.js")"></script>
$(function () {
$('#MarketSelect').change(function () {
    var URL = $('#EventForm').data('stationListAction');
    $.getJSON(URL + '/' + $('#MarketSelect').val(), function (data) {
        var items = '<option>Stations</option>';
        $.each(data, function (i, station) {
            items += "<option value='" + station.Value + "'>" + station.Text + "</option>";
        });
            $('#StationSelect').html(items);
            $("#StationSelect").trigger("liszt:updated");
            $("#StationSelect").change();
        });
    });
});

最后，我有一个控制器动作如下:

public ActionResult StationList(string market) {
        string Market = market;
        var stations = from s in ListInfo.Stations()
                       where s.MarketName == Market
                       select s;
        if(HttpContext.Request.IsAjaxRequest())
        {
            return Json(new MultiSelectList(
                stations.ToArray(),
                "SalemOrgObjID",
                "Name"),
                JsonRequestBehavior.AllowGet);
        }
        return RedirectToAction("CreateEvent");
    }

ListInfo。Stations看起来像这样:

public static IQueryable<StationData> Stations(){
    return db.Stations.ToList().AsQueryable();
}

第一个下拉列表是填充Fine (MarketSelect)，但是一旦选择了Market, Station List就不会填充。