Question

我得到＆＃34; ObjectContext实例已被处理，不能再用于需要连接的操作＆＃34;当我尝试为关系SQL数据库实现jQuery DataTable时，我的Intranet应用程序上出现错误消息。

这是我的HomeController代码：

using CyberAssets.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace CyberAssets.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult loaddata()
        {
            using (CyberAssetsEntities dc = new CyberAssetsEntities())
            {
                var data = dc.CyberAssets.OrderBy(a => a.Id).ToList();
                return Json(new { data = data }, JsonRequestBehavior.AllowGet);
            }
        }
    }
}

这是我使用DataTable查看的代码：

@section Scripts {
<script src="//cdn.datatables.net/1.10.15/js/jquery.dataTables.min.js"></script>
<script>
    $(document).ready(function () {
        $('#DataTbl').DataTable({
            "ajax": {
                "url": "/Home/loaddata",
                "type": "GET",
                "datatype": "json"
            },
            "columns": [
                { "data": "FacilityName", "autowidth": true },
                { "data": "FacilityType", "autowidth": true },
                { "data": "MachineType", "autowidth": true },
                { "data": "MachineFunctionDesc", "autowidth": true },
                { "data": "PhysicalLocation", "autowidth": true }
            ]
        });
    });
</script>
}

如何在HomeController的loaddata() using块中预加载我需要引用的对象，基本上＆＃34;避免＆＃34;延迟加载？

Answer 1

您需要在DataTable初始化代码中添加以下行：

$('#DataTbl').DataTable({
        "processing": true,
        "serverSide": true,
        "ajax": {
            "url": "/Home/loaddata",
            "type": "GET",
            "datatype": "json"
        },
        "columns": [
            { "data": "FacilityName", "autowidth": true },
            { "data": "FacilityType", "autowidth": true },
            { "data": "MachineType", "autowidth": true },
            { "data": "MachineFunctionDesc", "autowidth": true },
            { "data": "PhysicalLocation", "autowidth": true }
        ]
    });

因此，您对DataTable的代码应如下所示：

Conversion_Date     User_Name     Last_Date_Touch     Touch_Count
      7/15/2017             A           6/17/2017               1
      7/16/2017             B           6/24/2017               2
      7/19/2017             A           6/20/2017               1
      7/19/2017             C           6/29/2017               1

实现jQuery DataTable时出现延迟加载问题

1 个答案: