传入字典的模型项的类型为'System.Linq.Enumerable

本文关键字：System Linq Enumerable 类型 字典 模型 | 更新日期: 2023-09-27 18:04:48

我试过这段代码一次，没有任何异常。但是现在当我以同样的方式再次执行时我得到了这个异常，

传入字典的模型项的类型为'System.Linq.Enumerable+WhereListIterator ' 1[myapp12.Models. model]。，但是这个字典需要一个类型为"myapp12.Models.Customer"的模型项。

这是我的代码

CustomerController 

**public class CustomerController : Controller
    {
        //
        // GET: /Customer/
        List<Customer> CustomerCollection = new List<Customer>();
        public CustomerController()
        {
            Customer cus = new Customer();
            cus.CustomerId = 1;
            cus.Name = "Mags";
            cus.Gender = "Male";
            cus.City = "jerks";
            CustomerCollection.Add(cus);
            cus = new Customer();
            cus.CustomerId = 2;
            cus.Name = "Jacob";
            cus.Gender = "Male";
            cus.City = "Wagga";
            CustomerCollection.Add(cus);
            cus = new Customer();
            cus.CustomerId = 3;
            cus.Name = "Gags";
            cus.Gender = "Male";
            cus.City = "NewYork";
            CustomerCollection.Add(cus);
        }
        public ActionResult GetCustomerList()
        {
            return View(CustomerCollection);
        }
        public ActionResult GetCustomer(int id)
        {
            var selectedCustomer = CustomerCollection.Where(p => p.CustomerId == id);
            return View(selectedCustomer);
        }**

GetCustomerList。aspx(视图)

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<IEnumerable<myapp12.Models.Customer>>" %>
<!DOCTYPE html>
<html>
<head runat="server">
    <meta name="viewport" content="width=device-width" />
    <title>GetCustomerList</title>
</head>
<body>
    <p>
        <%: Html.ActionLink("Create New", "Create") %>
    </p>
    <table>
        <tr>
            <th>
                <%: Html.DisplayNameFor(model => model.Name) %>
            </th>
            <th>
                <%: Html.DisplayNameFor(model => model.Gender) %>
            </th>
            <th>
                <%: Html.DisplayNameFor(model => model.City) %>
            </th>
            <th></th>
        </tr>
    <% foreach (var item in Model) { %>
        <tr>
            <td>
                <%: Html.DisplayFor(modelItem => item.Name) %>
            </td>
            <td>
                <%: Html.DisplayFor(modelItem => item.Gender) %>
            </td>
            <td>
                <%: Html.DisplayFor(modelItem => item.City) %>
            </td>
            <td>
                <%: Html.ActionLink("Edit", "Edit", new { id=item.CustomerId }) %> 
                <%: Html.ActionLink("Details", "GetCustomer", new { id = item.CustomerId })%> 
                <%: Html.ActionLink("Delete", "Delete", new { id=item.CustomerId }) %>
            </td>
        </tr>
    <% } %>
    </table>
</body>
</html>

GetCustomer.aspx(view)这是获取特定用户的详细信息。

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<myapp12.Models.Customer>" %>
<!DOCTYPE html>
<html>
<head runat="server">
    <meta name="viewport" content="width=device-width" />
    <title>GetCustomer</title>
</head>
<body>
    <fieldset>
        <legend>Customer</legend>
        <div class="display-label">
            <%: Html.DisplayNameFor(model => model.Name) %>
        </div>
        <div class="display-field">
            <%: Html.DisplayFor(model => model.Name) %>
        </div>
        <div class="display-label">
            <%: Html.DisplayNameFor(model => model.Gender) %>
        </div>
        <div class="display-field">
            <%: Html.DisplayFor(model => model.Gender) %>
        </div>
        <div class="display-label">
            <%: Html.DisplayNameFor(model => model.City) %>
        </div>
        <div class="display-field">
            <%: Html.DisplayFor(model => model.City) %>
        </div>
    </fieldset>
    <p>
        <%: Html.ActionLink("Edit", "Edit", new { id=Model.CustomerId }) %> |
        <%: Html.ActionLink("Back to List", "GetCustomerList") %>
    </p>
</body>
</html>

当我第一次做的时候，这对我第一次有效。但现在不行了?我该怎么办?

传入字典的模型项的类型为'System.Linq.Enumerable

你有

  var selectedCustomer = 
  CustomerCollection.Where(p => p.CustomerId == id);

应该放在

的地方
  var selectedCustomer = 
  CustomerCollection.Where(p => p.CustomerId == id).FirstOrDefault();

如果不获取列表的第一个元素，则实际上传递的是一个可枚举列表，而不是单个元素。

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