如何通过DropdownList使用jQuery传递两个或多个参数？

Question

HomeController

class Loading extends Component {
    constructor(props) {
        super(props);
        this.state =  {isLoading : props.show};
    }

    componentWillReceiveProps(nextProps) {
        this.setState({ isLoading: nextProps.show });
    }
    render() {
        if (this.state.isLoading) {
          return (
            <div className="loading">
              <div className="loading-message">
              Carregando...
              </div>
            </div>);
        }
        return ('');
    }
}

export default Loading;

查看

public JsonResult GetCity(string DistrictID)
{
  db.Configuration.ProxyCreationEnabled = false;

cityList = db.Cities.Where(predicate: x => x.DistrictID == DistrictID).OrderBy(x => x.CityName).ToList();       

ViewBag.City = cityList.OrderBy(x => x.CityName);

return Json(ViewBag.City, JsonRequestBehavior.AllowGet);
}

此方法返回特定地区内的城市（级联DropdownList）。它正在100％工作。 现在，我想使用类似的逻辑和代码返回基于地区和城市的郊区。我该如何实施？ （请包括所有必需的代码，即HomeController，它是View，尤其是jQuery部分）

@Html.LabelFor(m => m.CityID, "City", new { @class = "col-md-3 control-label" })
            <div class="col-md-6">
                @Html.DropDownListFor(model => model.CityID, new SelectList(" "), "--Select City--", new { @class = "form-control" })
            </div>

<script>
                 $(document).ready(function () {
                        $("#DistrictID").change(function () {
                            $.get("/Home/GetCity", { DistrictID: $("#DistrictID").val() }, function (data) {
                                $("#CityID").empty();
                                $("#CityID").html('<option value="">--Select City--</option>');
                                $.each(data, function (index, row) {
                                    $("#CityID").append("<option value='" + row.CityID + "'>" + row.CityName + "</option>").trigger("chosen:updated")
                                });
                            });
                        })
                    });
                </script>