EXTJS 4.0 + MVC 实现Tree菜单显示

Ext.require([
            'Ext.tree.*',
            'Ext.data.*'
        ]);
        Ext.onReady(function () {
            var store = Ext.create('Ext.data.TreeStore', {
                proxy: {
                    type: 'ajax',
                    url: '/Home/LoadTree'
                },
                root: {
                    expanded: true,
                    text: "root",
                    user: "",
                    status: "",
                    id: "0"
                }
            });
            var tree = Ext.create('Ext.tree.Panel', {
                title: 'Simple Tree',
                200,
                autoHeight: true,
                store: store,
                rootVisible: false,
                renderTo: Ext.getBody()
            });
            //用于选中某一项时实现跳转
            tree.on("itemclick", function (view, record, item, index, e) {
                //选中叶子节点时才跳转，可根据需求而定
                if (record.raw.leaf)
                    location.href = "Index.aspx?id=" + record.raw.id;
            });

 　　　　

　　　　//后台处理

　　　　[HttpGet]

            public void LoadTree()            

　　　　{              

　　　　　　   int node = 0;      

　　              // 一次性加载所有数据

                 var list = from item in dc.Member where item.Father == node select item;

                 sb.Append("[");

                 if (list != null && list.Count() > 0)       

　　         {         

　　　　            //也可添加href:'链接'来实现跳转     

　　                foreach (Models.Member item in list)

                    {     

                  　　  sb.Append( ",{ text : '" + item.MemberName + "',id : " + item.MemberId);     

　　                    GetTree(item.MemberId);       

　　                   sb.Append(" } ");

                    }        

              }         

            sb.Append("]");      

           sb = sb.Replace("[,", "[");       

            Response.Write(sb);     

            Response.End();         

    }

            public void GetTree(int id)    

　         {          

　　　　      var list = from item in dc.Member where item.Father == id select item;          

　　　　      if(list == null || list.Count() <=0  )       

　　　　      {                

　　　　　　　　     sb.Append(", leaf : true");       

　　　　　　           return;      

　　          }              

　　　　　　 sb.Append(", expanded : true, children : [");   

                 foreach (Models.Member item in list)               

　　　　　　{                  

　　　　　　　　  sb.Append(",{ text : '" + item.MemberName + "', id : " + item.MemberId);

　　                   GetTree(item.MemberId);              

　　　　　　       sb.Append(" } ");  

                 }           

                 sb.Append("]");      

       }　

 　　最终效果为：