500 内部服务器错误 Asp.net C# 数据表

Question

我有 MVC 5 asp.net C# 项目库存和餐厅，当我在项目中使用 Datatable 时，这是我的 html：

   <table class="table table-striped table-bordered table-hover" id="dataTables-example">
        <thead>
            <tr>
                <th>
                    @Resources.Tokens_Admin.Name
                </th>
                <th>
                    @Resources.Tokens_Admin.Category
                </th>
                <th>
                    @Resources.Tokens_Admin.Price
                </th>
                <th>
                    @Resources.Tokens_Admin.Image
                </th>
                <th>

                </th>
             </tr>
        </thead>
        <tfoot>
        </tfoot>
    </table>

和 JavaScript：

<script>
    $(document).ready(function () {
        $("#dataTables-example").DataTable({
            "ajax": {`enter code here`
                "url": "/Meals/GetMealsList",
                "type": "POST",
                "datatype": "json"
            },
            "columns": [
                   { "data": "Name", "name": "Name" },
                   { "data": "CatId", "name": "CatId" },                      
                   { "data": "Price", "name": "Price" },
                   { "data": "Image", "name": "Image" },
                   {
                       "data": "Id", "render": function (Id, type, full, meta) {
                           debugger
                           return '<a href="#" onclick="Edit(' + Id + ')"><i class="glyphicon glyphicon-pencil"></i></a>'
                  }

                   }
            ],
            "serverSide": "true",
            "order": [0, "asc"],
            "processing": "true",
            "language": {
                "processing": "processing...please wait"
            }
        });
    });
</script>

和控制器：

  [HttpPost]
          public ActionResult GetMealsList()
    {
        // server-side parameters
        int start = Convert.ToInt32(Request["start"]);
        int length = Convert.ToInt32(Request["length"]);
        string searchval = Request["search[value]"];
        string sortColumnName = Request["columns[" + Request["order[0][column]"] + "][name]"];
        string sortDirection = Request["order[0][dir]"];
        var MealList = db.Meals.ToList();
        int totalrows = MealList.Count();
        if (!string.IsNullOrEmpty(searchval))
        {
            MealList = MealList.Where(x => x.Price.ToString().Contains(searchval.ToLower()) || x.Category.Name.ToLower().Contains(searchval.ToLower())
            || x.Name.ToLower().Contains(searchval.ToLower())).ToList();
        }
        int totalrowsafterfiltering = MealList.Count();
        // sorting
        MealList = MealList.OrderBy(sortColumnName + " " + sortDirection).ToList();

        //paging
        MealList = MealList.Skip(start).Take(length).ToList();

        return Json(new { data = MealList, draw = Request["draw"], recordsTotal = totalrows, recordsFiltered = totalrowsafterfiltering }, JsonRequestBehavior.AllowGet);
    }

当我运行视图索引时，我遇到了内部服务器错误 500。 无法找到该资源。 说明：HTTP 404。您要查找的资源（或其依赖项之一）可能已被删除、名称已更改或暂时不可用。请查看以下 URL 并确保其拼写正确。 请求的 URL：/Meals/GetMealsList 有人可以帮忙吗？

Answer 1

首先我想在 Javascript 中改变你的行：

"url": "/Meals/GetMealsList",

到

"url": "@Url.Action("GetMealsList", "Meals")",

应该修复它。我假设您的控制器名为MealsController?

其次，我建议您执行以下操作，在其中创建代表数据表传回的数据的 ViewModel，这应该比您引用 Request 对象的方式更轻松应该使用模型绑定将 json 数据映射到您的模型。

注意，你不应该需要 Newtonsoft.Json.JsonProperty 行，我只是从一个项目中复制了这段代码（与 webapi 相关）。

    public class DataTablesSearchModel
    {
        // properties are not capital due to json mapping
        [Newtonsoft.Json.JsonProperty(PropertyName = "draw")]
        public int Draw { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "start")]
        public int Start { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "length")]
        public int Length { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "columns")]
        public List<Column> Columns { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "search")]
        public Search Search { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "order")]
        public List<Order> Order { get; set; }
    }

    public class Column
    {
        [Newtonsoft.Json.JsonProperty(PropertyName = "data")]
        public string Data { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "name")]
        public string Name { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "searchable")]
        public bool Searchable { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "orderable")]
        public bool Orderable { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "search")]
        public Search Search { get; set; }
    }

    public class Search
    {
        [Newtonsoft.Json.JsonProperty(PropertyName = "value")]
        public string Value { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "regex")]
        public string Regex { get; set; }
    }

    public class Order
    {
        [Newtonsoft.Json.JsonProperty(PropertyName = "column")]
        public int Column { get; set; }

        [Newtonsoft.Json.JsonProperty(PropertyName = "dir")]
        public string Dir { get; set; }
    }

那么你的控制器动作如下所示：

[HttpPost]
      public ActionResult GetMealsList(DataTablesSearchModel model)
{
     //Access model for the data passed by datatables.
}