在JqGrid Treegrid中使用List

Question

我目前正在尝试将json从控制器传递到jqgrid树。如果我使用嵌入在javascript变量中的JSON字符串，我能够正确显示树：

var TagsJson=
                [
                   {
                       "id": "1","elementName": "Category: Arms/Pods", level:"0", parent:"", isLeaf:false, expanded:true, loaded:true
                   },
                   {
                       "id": "1_1","elementName": "AP | Active Pod Count (On an Arm)", level: "1", parent: "1", isLeaf: true, expanded: true, loaded: true
                   },

查看地点：

 grid.jqGrid({
            datastr: TagsJson,
            datatype: "jsonstring",
            mtype : 'POST',
            height: "auto",
            loadui: "disable",
            colNames: ["Tag | Description"],
            colModel: [
                {name: "elementName", width:250, resizable: false}
            ],
            treeGrid: true,
            treeGridModel: "adjacency",
            ExpandColumn: "elementName",
            rowNum: 10000,
            treeIcons: {leaf:'ui-icon-document-b'},
            jsonReader: {
                repeatitems: false,
                root: function (obj) { return obj; },
                records: function (obj) { return obj.length; }
            }
        });

我现在想要的是使用Controller传递数据而不是硬编码到变量：

我的控制器：

public JsonResult GetSpTreeJson()       
 {

        var TagsJson = new
        {
            total = 1,
            page = 1,
            records = 2,
            rows = new[]
            {
                new {id = 1, cell = new object[] {"1", "root 1", "0", "1", false, true, true}},
                new {id = 11, cell = new object[] {"11", "child 11", "1", "1", true, true, true}}
            }
        };

        return Json(TagsJson, JsonRequestBehavior.AllowGet);

    }

我修改了View以从控制器获取json但没有任何反应，网格上没有显示数据但是在调试模式下有来自控制器的数据，下面是编辑的View，我做错了什么？

 grid.jqGrid({
            datatype: "json",
            mtype: 'POST',
            url: '/Demo/GetSpTreeJson/',
            colNames: ["Tag | Description"],
            colModel: [
                {name: "elementName", width:250, resizable: false}
            ],
            treeGrid: true,
            treeGridModel: "adjacency",
            ExpandColumn: "elementName",
            rowNum: 10000,
            treeIcons: {leaf:'ui-icon-document-b'},
            jsonReader: {
                repeatitems: false,
                root: function (obj) { return obj; },
                records: function (obj) { return obj.length; }
            },
            pager: "#list2",
        caption: "Objects"

        });