Question

我在尝试查看索引视图时遇到以下错误：

传递到字典中的模型项的类型为＆＃39; System.Collections.Generic.List1 [GRCWebApp.Models.MembershipType]＆＃39;，但此字典需要类型为＆＃39; System的模型项.Collections.Generic.IEnumerable1 [GRCWebApp.ViewModels.ListMembershipTypeViewModel]＆＃39;

控制器是：

        public ActionResult ListClubMembershipType(ListMembershipTypeViewModel model, int clubId)
    {
        var types = from s in db.MembershipTypes
                    where (s.ClubId == clubId)
                    orderby s.Type
                    select s;
        return View(types.ToList());
    }

视图模型是：

    public class ListMembershipTypeViewModel
{
    [Display(Name = "Type")]
    public String Type { get; set; }

    public int ClubId { get; set; }
}

观点是：

@model IEnumerable<GRCWebApp.ViewModels.ListMembershipTypeViewModel>

@{
ViewBag.Title = "Club Membership Types";
}

<h2>Club Membership Types</h2>

<table class="table">
<tr>
    <th>
        @Html.DisplayNameFor(model => model.Type)
    </th>
</tr>

@foreach (var item in Model) {
<tr>
    <td>
        @Html.DisplayFor(modelItem => item.Type)
    </td>
</tr>
}

</table>

@Html.Partial("AddClubMembershipType")

Answer 1

您的查询正在将List<MembershipType>传递给视图，但视图需要IEnumerable<ListMembershipTyp‌eViewModel>

将GET方法更改为

public ActionResult ListClubMembershipType(int clubId)
{

  var types = from s in db.MembershipTypes
              where (s.ClubId == clubId)
              orderby s.Type
              select s;
  var model = types.Select(t => new ListMembershipTyp‌eViewModel
  {
    Type = t.Type,
    ClubId = clubId
  });
  return View(model);    
}

附注：您的方法不应包含参数ListMembershipTypeViewModel model

Answer 2

您尝试传递给视图的内容和视图模型是两种不同的类型，将从数据库带来的实体bing转换为类型的对象：

ListMembershipTypeViewModel

您尝试将其传递给MembershipTypes列表

Answer 3

对于我来说，我通过遵循以下代码语法克服了此类错误，将其更改为问题场景以进行澄清。

Public ActionResult ListClubMembershipType(int clubId)
{
  List<MembershipTypeViewModel> types = db.MembershipTypes.Where(s=>s.ClubId == 
  clubId).OrderBy(s=>s.Type).ToList();
  return View(types);
}

在方案中，您只需从多个成员中查找单个成员：

List<MembershipTypeViewModel> types = db.MembershipTypes.Where(s=>s.ClubId == 
clubId).Take(1).ToList();

传递到字典中的模型项是类型的，但是这个字典需要一个类型为＆＃39; System.Collections.Generic.IEnumerable

3 个答案: