將模型傳遞到視圖

Question

因此，我將以下視圖模型傳遞給了我的視圖，但每次嘗試訪問該頁面時視圖都會拋出異常。爲什麼發生這種情況的任何解釋都會很好，如何解決這個問題的指針會更好！謝謝。

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]'. 

視圖模型

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

您發送單CategoryIndex對象查看，但你的觀點預計IEnumerable<CategoryIndex>.

Answer 2

華菱是正確的，你需要傳遞的IEnumerable。你可以修改你的代碼：

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); 
}