我是Mvc的新手，我遇到过对象引用空错误

问题描述

@model MVCStrongTypeViewExample.Models.EmployeeViewModel
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>




@using (Html.BeginForm("Search", "Home"))
{
    @Html.LabelFor(model => model.filter.EmpNo)
    @Html.TextBoxFor(model => model.filter.EmpNo) <br />
    @Html.LabelFor(model => model.filter.EmpName)
    @Html.TextBoxFor(model => model.filter.EmpName) <br />

    <input type="submit" value="Edit Product" />
}
<table>
    <thead>
        <tr>
            <th>EmpNo</th>
            <th>Name</th>
            <th>Designation</th>
            <th>Phone</th>
        </tr>
    </thead>
    <tbody>

        @foreach (var employee in Model.EmployeeTablelist)
        {
        <tr>
            <td>@employee.EmpId</td>
            <td>@employee.EmpName</td>
            <td>@employee.Desgination</td>
            <td>@employee.mobile_no</td>
        </tr>
        }

    </tbody>
</table>

控制器代码

controller code

public ActionResult Index()
       {
           return View();
       }
       [HttpPost]
       public ActionResult Search(EmployeeViewModel Model)
       {
           EmployeeViewModel model = new EmployeeViewModel();
           if (ModelState.IsValid && Model !=null)
           {
               using (TestEntities data=new TestEntities())
               {
                   model.EmployeeTablelist = (from tablist in data.Employes where tablist.EmpName.Contains(Model.filter.EmpName) || tablist.EmpId.Equals(Model.filter.EmpNo) select new EmployeeListItem() { EmpName = tablist.EmpName, Desgination = tablist.Desgination, mobile_no = tablist.mobile_no }).ToList();
               }
           }
           return View(model);
       }

Class EmployeeViewModel

Class EmployeeViewModel

public class EmployeeViewModel
   {
       public EmployeeViewModel() { filter = new EmployeeFilter(); EmployeeTablelist = new List<EmployeeListItem>(); }

       public EmployeeFilter filter { get; set; }
       public List<EmployeeListItem> EmployeeTablelist { get; set; }
   }

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