Select语句中的MVC空引用异常

Question

我正在设置一个简单的MVC页面来提高自己的技能。它使用ADO.NET运行存储过程，该存储过程可以选择，插入，更新或删除单个数据库表中的行。插入工作正常。其他不是

[HttpGet]
    public ActionResult Select()
    {
        //Models.Employee E = new Models.Employee();
        //return View(E);
        return View();
    }
    [HttpPost]//can only be triggered after post from browser
    public ActionResult Select(string FirstName, string    
LastName,string   EmpCode,string Office,string Position,int Salary)
    {
        List<Models.Employee> Employees = new List<Models.Employee>();
        Select C = new Select();
        C.RetrieveData(FirstName, LastName,     
EmpCode,Office,Position,Salary);
        return View("List",Employees);

    }
namespace UI.Models
{
public class Employee
{
    public int EmployeeID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string EmpCode { get; set; }
    public string Position { get; set; }
    public string Office { get; set; }
    public int Salary { get; set; }
}
}
@model IEnumerable<UI.Models.Employee>

@{
ViewBag.Title = "Select";

}

<h2>Select</h2>

<p>
@Html.ActionLink("Create New", "Create")
</p>
<table class="table">
<tr>
    <th>
        @Html.DisplayNameFor(model => model.FirstName)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.LastName)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.EmpCode)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.Position)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.Office)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.Salary)
    </th>
    <th></th>
</tr>

@foreach (var item in Model) {
<tr>
    <td>
        @Html.DisplayFor(modelItem => item.FirstName)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.LastName)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.EmpCode)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.Position)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.Office)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.Salary)
    </td>
    <td>
        @Html.ActionLink("Edit", "Edit", new { id=item.EmployeeID }) |
        @Html.ActionLink("Details", "Details", new {    
id=item.EmployeeID }) |
        @Html.ActionLink("Delete", "Delete", new { id=item.EmployeeID })
    </td>
</tr>
}

</table>

当我按下我的MVC页面上的选择按钮时，我想查看表中的所有记录。我实际上在这一行上得到了一个空引用异常。 @foreach（模型中的变量项）{ 你调用的对象是空的。 是控制器，模型还是视图出现问题？
我该如何解决？