如何使用 ViewBag 显示列表 [英] How to display a list using ViewBag

问题描述

我需要使用 viewbag 显示数据列表.但我无法做到.
请帮我..
我试过这个:

Hi i need to show a list of data using viewbag.but i am not able to do it.
Please Help me..
I tried this thing:

 ICollection<Learner> list = new HobbyHomeService().FetchLearner();
 ICollection<Person> personlist = new HobbyHomeService().FetchPerson(list);
 ViewBag.data = personlist;

和内部视图:

 <td>@ViewBag.data.First().FirstName</td>

但这并没有显示值并给出错误提示Model.Person 不包含 First() 的定义"

But this does not show up the value and gives error saying "Model.Person doesnot contain a defibition for First()"

推荐答案

在您看来，您必须将其转换回原始类型.没有演员表，它只是一个对象.

In your view, you have to cast it back to the original type. Without the cast, it's just an object.

<td>@((ViewBag.data as ICollection<Person>).First().FirstName)</td>

ViewBag 是 C# 4 动态类型.除非强制转换，否则从它返回的实体也是动态的.但是，像 .First() 和所有其他 Linq 扩展方法 不使用动态.

ViewBag is a C# 4 dynamic type. Entities returned from it are also dynamic unless cast. However, extension methods like .First() and all the other Linq ones do not work with dynamics.

编辑 - 处理评论:

如果你想显示整个列表，就这么简单:

If you want to display the whole list, it's as simple as this:

<ul>
    @foreach (var person in ViewBag.data)
    {
        <li>@person.FirstName</li>
    }
</ul>

像 .First() 这样的扩展方法不起作用，但这个方法会起作用.

Extension methods like .First() won't work, but this will.

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