调用 DisplayNameFor 的 IEnumerable 重载 [英] Calling IEnumerable overload of DisplayNameFor

问题描述

这适用于抓取标题(NOT VALUES):

This works for grabbing the headers(NOT VALUES):

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

如果 SomeModelProperty 是:

Which if SomeModelProperty were:

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

然后它会在标题 th 元素中显示一个优秀的标题".

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

您会认为这不起作用，因为模型是 IEnumerable，它没有 m.SomeModelProperty，但它起作用是因为 HtmlHelper 有一个 HtmlHelper> 这样的lambda 的参数是 TModel，而不是 IEnumerable.由于这仅使用元数据，因此不需要集合中的项目.(尽管 m. 上的智能感知会骗你，让你认为它是一个集合).我不确定这个很酷的重载是什么时候添加的，但对于 Index.cshtml 来说非常方便，并且消除了诸如 @Html.DisplayNameFor(m => @Model.FirstOrDefault().SomeModelProperty)我想避免.

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

但是，当我的模型不是 IEnumerable 而是包含 IEnumerable 作为属性时，我无法弄清楚如何使其工作，例如:

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; }
}

我希望对泛型类型参数进行明确，但我认为类型参数是由从页面创建的 HtmlHelper 滴下的引擎指定的.我可以在页面中声明一个新的 HtmlHelper，或者以某种方式明确指定类型参数吗?

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:

Index.cshtml:

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

推荐答案

另一种类似的解决方法即使没有行也能起作用:

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>
...

这篇关于调用 DisplayNameFor 的 IEnumerable 重载的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！