Question

我是新手，在MVC ASP.net中使用datatables和ajax。我有问题，我很难解决这个问题。我尝试连接两个表，如标题所示，并将结果返回到json并显示到datatable。但我得到＆＃34的错误;由于已经处理了DbContext，因此无法完成操作。＆＃34;。任何帮助都对我学习这门语言很有帮助。谢谢

这是我的代码

public ActionResult Rooms()
        {
            using (RoomReservationEntities db = new RoomReservationEntities())
            {
                var room_query = from room in db.Rooms
                        join roomType in db.Room_Type
                        on room.RoomType_id equals roomType.RoomType_id
                        select new { room.Room_id, room.Room_name, roomType.RoomType, roomType.Room_rate };

                return Json(new { data = room_query }, JsonRequestBehavior.AllowGet);
            }
        }

我的cshtml

@{
    ViewBag.Title = "Rooms";
    Layout = "~/Views/Shared/_AdminMasterPage.cshtml";
}

<h2>Rooms</h2>

<link rel="stylesheet" href="https://cdn.datatables.net/1.10.13/css/jquery.dataTables.min.css" />

<h2>AdminRooms</h2>

<div style="width:90%; margin:0 auto">
    <table id="myDatatable">
        <thead>
            <tr>
                <th>Room Name</th>
                <th>Room Type</th>
                <th>Room Rate</th>
            </tr>
        </thead>

    </table>
</div>


@section scritps{
    <script src="~/Scripts/jquery.validate.min.js"></script>
    <script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
    <script src="https://cdn.datatables.net/1.10.13/js/jquery.dataTables.min.js"></script>
    <script src="~/Scripts/jquery-ui-1.12.1.min.js"></script>
}

<script>
    $(document).ready(function () {
        var oTable = $('#myDatatable').DataTable({
            "ajax": {
                "url": '/Admin/Rooms',
                "type": "get",
                "datatype":"json"
            },
            "columns": [
                { "data": "Room_name", "autoWidth": true },
                { "data": "RoomType", "autoWidth": true },
                { "data": "Room_rate", "autoWidth": true }
            ]

        })
    })
</script>

Answer 1

这是因为你正在使用“使用”阻止使用块调用Dispose方法一找到结束括号。另一个原因可能是因为Linq查询在ToList（）或枚举访问之前不会触发。在您的代码中，没有这样的方法可以检查以下代码：

public ActionResult Rooms()
        {
            using (RoomReservationEntities db = new RoomReservationEntities())
            {
                var room_query = (from room in db.Rooms
                        join roomType in db.Room_Type
                        on room.RoomType_id equals roomType.RoomType_id
                        select new { room.Room_id, room.Room_name, roomType.RoomType, roomType.Room_rate }).ToList();

                return Json(new { data = room_query }, JsonRequestBehavior.AllowGet);
            }
        }

您可以找到有关Linq查询早期绑定和后期绑定的更多信息

Linq：内部连接两个表并返回json作为jquery数据表

1 个答案: