Question

所以我将以下视图模型传递给我的视图，但是每当我尝试访问该页面时视图都会抛出异常。关于为什么会发生这种情况的任何解释都会很棒，关于如何修复它的指针会更好！感谢。

The model item passed into the dictionary is of type 
MyCompareBase.Models.CategoryIndex', but this dictionary requires a model item 
of type
'System.Collections.Generic.IEnumerable`1[MyCompareBase.Models.CategoryIndex]'.

查看模型

public class CategoryIndex
{
    public string Title { get; set; }
    [DisplayName("Categories")]
    public IEnumerable<string> CategoryNames { get; set; }

}

查看

@model IEnumerable<MyCompareBase.Models.CategoryIndex>

@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Index</h2>

<p>
@Html.ActionLink("Create New", "Create")
</p>
<table>
<tr>
    <th>
        @Html.DisplayNameFor(model => model.Title)
    </th>
    <th></th>
</tr>

  @foreach (var item in Model) {
<tr>
    <td>
        @Html.DisplayFor(modelItem => item.CategoryNames)
    </td>
    <td>
        @Html.ActionLink("Edit", "Edit", new { /* id=item.PrimaryKey */ }) |
        @Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ }) |
        @Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
    </td>
</tr>

}

控制器

public ActionResult Index()
    {

        var localDb = db.Categories.Select(c => c.Name);
        var wcf = category.Categories().Select(c => c.Name);

        var all = new HashSet<String>(localDb);
        all.UnionWith(wcf);

        var viewModel = new Models.CategoryIndex
        {
            Title = "Avaliable Product Categories",
            CategoryNames = all.AsEnumerable()
        };

        return View(viewModel);
    }

Answer 1

您要发送单个CategoryIndex对象进行查看，但您的视图需要IEnumerable<CategoryIndex>.

Answer 2

Valin是正确的，您需要传递IEnumerable。您可以将代码修改为：

public ActionResult Index()
{
    var localDb = new List<string>{"a", "b"};
    var wcf = new List<string>{"b","c"};

    var all = new HashSet<String>(localDb);
    all.UnionWith(wcf);

    var viewModel = new List<CategoryIndex>
    {
        new CategoryIndex
            {
                Title = "Avaliable Product Categories",
                CategoryNames = all.AsEnumerable()
            }
    };

    return View(viewModel);
}

将模型传递给视图

2 个答案: