调用DisplayNameFor的IEnumerable的超载 [英] Calling IEnumerable overload of DisplayNameFor

问题描述

这适用于抓住头文件（不会VALUES ）

  @model IEnumerable的＆LT; SomeModel＆GT;
...
＆LT;第i @ Html.DisplayNameFor（M = GT; m.SomeModelProperty）LT; /第i
 

这意味着，如果SomeModelProperty是：

  [显示（NAME =一个出色的头球）]
SomeModelProperty {搞定;组; }
 

然后，它会在标题显示一个出色的头球个元素。

您会认为这是行不通的，因为该模型的IEnumerable，这不会有m.SomeModelProperty，但它的作品，因为的HtmlHelper有一个的HtmlHelper＆LT; IEnumerable的＆LT;的TModel＆GT;＆GT; 使得拉姆达的参数是的TModel ，而不是的IEnumerable＆LT;的TModel＆GT; 。由于这只是使用元数据，也没有必要对从集合的一个项目。 （虽然米智能感知。会骗你，让你认为这是一个集合）。我不知道什么时候加入这个凉爽的超载，但还是比较方便的Index.cshtml并摒弃了像 @ Html.DisplayNameFor（M = GT时髦的东西; @ Model.FirstOrDefault（）SomeModelProperty ）我希望避免的。

<一个href=\"http://msdn.microsoft.com/en-us/library/hh833697(v=vs.108).aspx\">http://msdn.microsoft.com/en-us/library/hh833697(v=vs.108).aspx

不过，我无法弄清楚如何得到这个当我的模式是不是IEnumerable的工作，而是包含了IEnumerable作为一个属性，如：

 公共类SomeList
{
   公开名单＆LT; SomeModel＆GT; SomeModels {搞定;组; }
   公众诠释页{搞定;组; }
   公众的DateTime CurrentAsOf {搞定;组; }
}
 

我希望是明确的泛型类型的参数，但我认为类型参数是由从该页面创建的HtmlHelper淌下发动机指定。我可以宣布一个新的HtmlHelper页面，或以某种方式显式地指定类型参数？

Index.cshtml：

  @model SomeList
//不知道如何做到这一点：
@ Html.DisplayNameFor＆LT;＆IEnumerable的LT; SomeModel＆GT;＆GT;（M = GT; m.SomeModelProperty）
 

解决方案

另一个类似的解决办法，如果没有行的作品甚至可以是：

  ...
@ {VAR哑= Model.FirstOrDefault（）; }
    ＆所述; TR＆GT;
        ＆LT;第i个
            @ Html.DisplayNameFor（型号=＆GT; dummy.SomeModelProperty）
        ＆LT; /第i
...
 

This works for grabbing the headers(NOT VALUES):

@model IEnumerable<SomeModel>
...
<th>@Html.DisplayNameFor(m => m.SomeModelProperty)</th>

Which if SomeModelProperty were:

[Display(Name = "An Excellent Header")]
SomeModelProperty { get; set; }

Then it would display "An Excellent Header" in the header th element.

You would think this wouldn't work because the model is IEnumerable, which wouldn't have a m.SomeModelProperty, but it works because HtmlHelper has a HtmlHelper<IEnumerable<TModel>> such that the parameter of the lambda is TModel, not IEnumerable<TModel>. Since this just uses metadata, there is no need for an item from the collection. (Although intellisense on m. will lie to you and make you think it's a collection). I'm not sure when this cool overload was added, but is quite handy for Index.cshtml and does away with funky things like @Html.DisplayNameFor(m => @Model.FirstOrDefault().SomeModelProperty) which I want to avoid.

http://msdn.microsoft.com/en-us/library/hh833697(v=vs.108).aspx

However, I can't figure out how to get this to work when my model is not IEnumerable, but instead contains IEnumerable as a property, such as:

public class SomeList
{
   public List<SomeModel> SomeModels { get; set; }
   public int Page { get; set; }
   public DateTime CurrentAsOf { get; set; }
}

I was hoping to be explicit with the generic type parameters, but I think the type parameters are specified by the engine that trickles down from the HtmlHelper created with the page. Can I declare a new HtmlHelper in the page, or somehow specify the type parameters explicitly?

Index.cshtml:

@model SomeList
//No idea how to do this:
@Html.DisplayNameFor<IEnumerable<SomeModel>>(m => m.SomeModelProperty)

解决方案

Another similar workaround that works even if there are no rows could be:

...
@{var dummy = Model.FirstOrDefault(); }
    <tr>
        <th>
            @Html.DisplayNameFor(model => dummy.SomeModelProperty)
        </th>
...

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