我需要把一张表以easyui树的形式显示，求教

我需要把一张表以easyui树的形式显示，这张表有parentID，看下图
前台我是这样写的：

 jQuery(function() {
           $('#tree').tree({
               url: '../Handlers/ECTree.ashx',
               method: 'get',
               animate: true,
               loadFilter: function (data) { 
                   alert(data);
                   if (data.d) {
                       return data.d;
                   } else { 
                       return data;
                   }
               }
           });
       });

后台一般处理文件是这样写的，我已拿到该表的实体对象，需要拼接成Tree能识别的json格式的数据，该怎么写呢？

  public void ProcessRequest(HttpContext context)
        {
            StringBuilder stringBuilder = new StringBuilder();
            IList<EC> ec = ECBLL.GetList();
            foreach (EC row in ec)
            {

                stringBuilder.Append("[{");
                stringBuilder.Append("\"id\":\"" + row.ECID+"\",");
                stringBuilder.Append("\"text\":\"" + row.ECName+"\",");
                stringBuilder.Append("\"children\":\"" +row.ParentID); 
                stringBuilder.Append("}]");
            }
            JavaScriptSerializer jss = new JavaScriptSerializer();
            string jsons = jss.Serialize(stringBuilder);
            context.Response.Write(jsons);
        }

自己遍历生成下面类型的数据输出就行

[{
    "id":1,
    "text":"My Documents",
    "children":[{
        "id":11,
        "text":"Photos",
        "state":"closed",
        "children":[{
            "id":111,
            "text":"Friend"
        },{
            "id":112,
            "text":"Wife"
        },{
            "id":113,
            "text":"Company"
        }]
    },{
        "id":12,
        "text":"Program Files",
        "children":[{
            "id":121,
            "text":"Intel"
        },{
            "id":122,
            "text":"Java",
            "attributes":{
                "p1":"Custom Attribute1",
                "p2":"Custom Attribute2"
            }
        },{
            "id":123,
            "text":"Microsoft Office"
        },{
            "id":124,
            "text":"Games",
            "checked":true
        }]
    },{
        "id":13,
        "text":"index.html"
    },{
        "id":14,
        "text":"about.html"
    },{
        "id":15,
        "text":"welcome.html"
    }]
}]

 StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.Append("[");
            foreach (EC row in ec)
            {
                                if(sb.length()!=1){
                                    sb.append(",");
                                }
                stringBuilder.Append("{");
                stringBuilder.Append("\"id\":\"" + row.ECID+"\",");
                stringBuilder.Append("\"text\":\"" + row.ECName+"\",");
                stringBuilder.Append("\"children\":\"" +row.ParentID); 
                stringBuilder.Append("}");
            }
                        stringBuilder.Append("]");

试试这个