将模型传递给视图

Posted 2023-02-26

【中文标题】将模型传递给视图

【英文标题】：Passing Model to View

【发布时间】：2013-12-16 17:52:35

【问题描述】：

所以我将以下视图模型传递给我的视图，但每次我尝试访问该页面时，视图都会引发异常。关于为什么会发生这种情况的任何解释都会很好，关于如何解决它的指针会更好！谢谢。

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);
    

【参考方案1】：

您正在发送单个 CategoryIndex 对象来查看，但您的视图需要 IEnumerable<CategoryIndex>.

【讨论】：

感谢您的帮助，对 .Net 还很陌生，但我已经解决了。

【参考方案2】：

Valin 是正确的，您需要通过 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);