KendoUI网格不更新数据源

Question

我有三个HTML下拉列表（由于性能而没有使用kendo下拉列表），在选择之后转到我的控制器操作并回发以更新网格。问题出在我进行第一次选择之后，之后的每个选择都将其设置回第一个选定值，因此新参数永远不会传递给我的控制器。

这是我的观点

<link href="~/Content/kendo/2014.1.318/kendo.default.min.css" rel=" stylesheet" />
<link href="~/Content/kendo/2014.1.318/kendo.common.min.css" rel="stylesheet" />

@Scripts.Render("~/bundles/jquery")

@Scripts.Render("~/bundles/Kendo")
@Html.Label("AB_ID: ")
@Html.DropDownList("AB_ID", null, "--SELECT--", htmlAttributes: new { @class = "btn btn-success dropdown-toggle" })
@Html.Label("AB_TYPE: ")
@Html.DropDownList("AB_TYPE", null, "--SELECT--", htmlAttributes: new { @class = "btn btn-success dropdown-toggle" })
@Html.Label("A_DD_ID: ")
@Html.DropDownList("A_DD_ID", null, "--SELECT--", htmlAttributes: new { @class = "btn btn-success dropdown-toggle" })


@(Html.Kendo().Grid(Model)
          .Name("Grid")
          .DataSource(data => data
                        .Server()
                        .Read(read => read.Action("Grid_Read", "ASSETs"))
                        .PageSize(10))
          .Pageable()
          .Sortable()
)

<script>
function passData() {
    var param = {};
    param.ab_id = $("#AB_ID").val();
    param.ab_type = $("#AB_TYPE").val();
    param.a_dd_id = $("#A_DD_ID").val();
    return param;
}

$(".dropdown-toggle").on("change", function () {
    var data = passData();
    var grid = $("#Grid").data("kendoGrid");

    grid.dataSource.read(data); 
});

这是我的控制器

public ActionResult Grid_Read([DataSourceRequest] DataSourceRequest request, string ab_id, string ab_type,
            string a_dd_id)
        {
            IQueryable<ASSET> assets = null;
            if (!string.IsNullOrEmpty(ab_id) || !string.IsNullOrEmpty(ab_type) || !string.IsNullOrEmpty(a_dd_id))
            {
                if (!string.IsNullOrEmpty(ab_id)
                    && !string.IsNullOrEmpty(ab_type)
                    && !string.IsNullOrEmpty(a_dd_id)
                    )
                {
                    assets = db.ASSETs.Join(db.ASSET_BASE,
                        c => c.A_AB_NO,
                        cm => cm.AB_NO, (c, cm) => new { A = c, AB = cm })
                        .Where(c => c.AB.AB_ID == ab_id && c.AB.AB_TYPE == ab_type && c.A.A_DD_ID == a_dd_id)
                        .Select(x => x.A);
                }
                else if (!string.IsNullOrEmpty(ab_id) && !string.IsNullOrEmpty(ab_type) )
                {
                    assets = db.ASSETs.Join(db.ASSET_BASE,
                        c => c.A_AB_NO,
                        cm => cm.AB_NO, (c, cm) => new { A = c, AB = cm })
                        .Where(c => c.AB.AB_ID == ab_id && c.AB.AB_TYPE == ab_type)
                        .Select(x => x.A);
                }
                else if (!string.IsNullOrEmpty(ab_id) )
                {
                    assets = db.ASSETs.Join(db.ASSET_BASE,
                        c => c.A_AB_NO,
                        cm => cm.AB_NO, (c, cm) => new { A = c, AB = cm })
                        .Where(c => c.AB.AB_ID == ab_id)
                        .Select(x => x.A);

                }
                else if (!string.IsNullOrEmpty(ab_type) && !string.IsNullOrEmpty(a_dd_id) )
                {
                    assets = db.ASSETs.Join(db.ASSET_BASE,
                        c => c.A_AB_NO,
                        cm => cm.AB_NO, (c, cm) => new { A = c, AB = cm })
                        .Where(c => c.AB.AB_TYPE == ab_type && c.A.A_DD_ID == a_dd_id)
                        .Select(x => x.A);

                }
                else if (!string.IsNullOrEmpty(ab_id) && !string.IsNullOrEmpty(a_dd_id) )
                {
                    assets = db.ASSETs.Join(db.ASSET_BASE,
                        c => c.A_AB_NO,
                        cm => cm.AB_NO, (c, cm) => new { A = c, AB = cm })
                        .Where(c => c.AB.AB_ID == ab_id && c.A.A_DD_ID == a_dd_id)
                        .Select(x => x.A);

                }
                else if (!string.IsNullOrEmpty(ab_type) )
                {
                    assets = db.ASSETs.Join(db.ASSET_BASE,
                        c => c.A_AB_NO,
                        cm => cm.AB_NO, (c, cm) => new { A = c, AB = cm })
                        .Where(c => c.AB.AB_TYPE == ab_type)
                        .Select(x => x.A);

                }
                else if (!string.IsNullOrEmpty(a_dd_id))
                {
                    assets = db.ASSETs.Join(db.ASSET_BASE,
                        c => c.A_AB_NO,
                        cm => cm.AB_NO, (c, cm) => new {A = c, AB = cm})
                        .Where(c => c.A.A_DD_ID == a_dd_id)
                        .Select(x => x.A);

                }



            }
            if (assets == null)
                assets = db.ASSETs;
            ViewBag.AB_ID = new SelectList(db.ASSET_BASE.Select(x => x.AB_ID).Distinct().OrderBy(x => x));
            ViewBag.AB_TYPE = new SelectList(db.ASSET_BASE.Select(x => x.AB_TYPE).Distinct().OrderBy(x => x));
            ViewBag.A_DD_ID = new SelectList(db.DICTIONARies.Select(x => x.DD_ID).Distinct().OrderBy(x => x));
            return View("Index", assets);
        }

我尝试使用以下内容更改数据源，但似乎仍然没有使用我的新参数更新数据源。我也尝试将网格从服务器端网格更改为客户端网格，结果相同。

var dataSource = new kendo.data.DataSource({
    data: [
        passData()
    ]
});
grid.setDataSource(dataSource);