EasyUI datagrid不支持自定义的JsonResut 吗？该怎么解决

EasyUI datagrid不支持自定义的JsonResut 吗？
   我自定义了一个JsonResult,直接返回一个字符串，字符串格式和系统返回的js格式相同。但是datagrid并没有识别，不知道是不是还需要设置别的，使用系统返回的json结果datagrid可以识别的。

   public class CustomJsonResult:JsonResult
    {
        public override void ExecuteResult(ControllerContext context)
        {
            HttpResponseBase response = context.HttpContext.Response;
            if (!string.IsNullOrEmpty(ContentType))
            {
                response.ContentType = ContentType;
            }
            else
            {
                response.ContentType="application/json";
            }
            if (ContentEncoding != null)
            {
                response.ContentEncoding = ContentEncoding;
            }
            if (Data != null)
            {
                response.Write(Data);
            }
        }
    }


        [HttpPost]
        public JsonResult GetAllUser()
        {
            var result = new CustomJsonResult();

            //这种写法是参考了系统JsonResult的返回结果的，而且在json编辑器里也可以正确识别。
            string sResult = "{'total':2,'rows':[{'ID':1,'UserName':'James','Address':'USA'},{'ID':2,'UserName':'Zhangsan','Address':'China'}]}"; 
 
           
            result.Data = sResult;

            return result;
        }

        public JsonResult GetAllUser1()
        {
            var result = new JsonResult();

            List<Person> persons = new List<Person>()
            {
                new Person{ ID=1,UserName="zhangsan", Address="China"},
                new Person{ ID=2,UserName="James", Address="USA"}
            };
            
            //datagrid数据源可正确识别。
            result.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
            result.Data = new { total=persons.Count,rows=persons};

            return result;
        }

  function GetAllPermission() {
            $("#usertable").datagrid({
                url: '/Home/GetAllUser1',
                onLoadSuccess: LoadSuccess,
                pageNumber: 1,
                columns: [[
            { field: 'ID', title: '序号', hidden: false },
            { field: 'UserName', title: '模块名称' },
            { field: 'Address', title: '对应控制器' }           
 
        ]]
            });
        }

        function LoadSuccess(data) {
            
        }

  <table id="usertable" class="easyui-datagrid" fit="true" style="" data-options=" rownumbers: true, singleSelect:true, animate: true,collapsible: 'true', fitColumns: true,pagination:'true'">
        <thead>
                    <tr>
                        <th data-options="field:'ID',width:40,align:'center'">
                            序号
                        </th>
                        <th data-options="field:'UserName',width:180,align:'center'">
                            用户名
                        </th>
                        <th data-options="field:'Address',width:180,align:'center'">
                            地质
                        </th>
                    
                      
                    </tr>
                </thead> 
 
    </table>

easyui datagrid
[解决办法]
测试了下。将贴出的数据存为txt后设置url转向这个txt没有问题。。可以显示数据，将设置项响应头的代码注释掉看看

/*            if (!string.IsNullOrEmpty(ContentType))
            {
                response.ContentType = ContentType;
            }
            else
            {
                response.ContentType="application/json";
            }
            if (ContentEncoding != null)
            {
                response.ContentEncoding = ContentEncoding;
            }*/

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