数据表服务器端C＃：警告-第0行的参数0

Question

$('#datatable').DataTable({
                "processing": true,
                "serverSide": true,
                "ajax": {
                    "url": "../../WebPost/AjaxPinToFolderSearch",
                    "data": function (d) {
                        d.postID = globalPinToFolderSearchID;
                    },
                    "columns": [
                        { "data": "Folder", "defaultContent": "Value Not Received" },
                        { "data": "Pinned", "defaultContent": "Value Not Received" },
                        { "data": "StartDate", "defaultContent": "Value Not Received" },
                        { "data": "EndDate", "defaultContent": "Value Not Received" }
                    ]
                }
            });

示例响应（来自开发人员工具“网络响应”）：

{"data":[{"Folder":"Home/Test One/Frogger","Pinned":false,"StartDate":"\/Date(18000000)\/","EndDate":"\/Date(18000000)\/"}]}

数据表似乎正在正常工作，因为它正在请求和接收数据。弹出错误，表格显示空白行（响应-表格中1行数据= 1行）。我意识到这是一个普遍的问题，但是我无法弄清楚出什么问题了。注意，后端是C＃。