如何从显示器（名称=）DataAnnotation在运行时一个强类型的列表视图脚手架拿到列标题？ [英] How to get the column titles from the Display(Name=) DataAnnotation for a strongly typed list scaffold view at runtime?

问题描述

我如何获得 [显示（名称=一些标题）] DataAnnotations有些题目，在列表脚手架视图的输出呈现？

How do I get the [Display(Name="Some Title")] DataAnnotations "Some Title" rendered in the List scaffold view's output?

我创建这个类的强类型列表脚手架视图：

I create a strongly typed list scaffold view for this class:

public class CompanyHoliday
{
    [Key]
    public int Id { get; set; }

    [Required]
    [Display(Name = "Datum")]
    [DataType(System.ComponentModel.DataAnnotations.DataType.Date)]
    public DateTime Date { get; set; }

    [Required]
    [StringLength(50)]
    [Display(Name = "Feiertag Name")]
    public string Name { get; set; }
}

的观点是这样的：

The view looks like this:

@model IEnumerable<Zeiterfassung.Domain.CompanyHoliday>

@{
    ViewBag.Title = "Year";
}

<h2>Year</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table>
<tr>
    <th></th>
    <th>
        Date
    </th>
    <th>
        Name
    </th>
</tr>

@foreach (var item in Model) {
<tr>
    <td>
        @Html.ActionLink("Edit", "Edit", new { id=item.Id }) |
        @Html.ActionLink("Details", "Details", new { id=item.Id }) |
        @Html.ActionLink("Delete", "Delete", new { id=item.Id })
    </td>
    <td>
        @String.Format("{0:g}", item.Date)
    </td>
    <td>
        @item.Name
    </td>
</tr>
}

</table>

不过，我不希望在表头日期和姓名。我想原点和Feiertag名动态呈现在那里。

However, I don't want "Date" and "Name" in the table header. I want "Datum" and "Feiertag Name" rendered there dynamically.

实际的列标题标题应该来自显示DataAnnotation。

The actual column header titles should come from the Display DataAnnotation.

我如何做到这一点？

推荐答案

一个老话题的位，但我想出了一个扩展方法来处理这​​个问题。

Bit of an old topic, but I came up with an extension method to handle this.

让说我的模式是：

public class MyModel
{
    [Display(Name = "Some Property")]
    public string SomeProp { get; set; }
}

放弃这一方法成为一个静态类：

Drop this method into a static class:

namespace Web.Extensions
{
    public static class HtmlHelperExtensions
    {
        public static MvcHtmlString DisplayNameFor<TModel, TProperty>(this HtmlHelper<IEnumerable<TModel>> helper, Expression<Func<TModel, TProperty>> expression)
        {
            var name = ExpressionHelper.GetExpressionText(expression);
            name = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
            var metadata = ModelMetadataProviders.Current.GetMetadataForProperty(() => Activator.CreateInstance<TModel>(), typeof(TModel), name);
            return new MvcHtmlString(metadata.DisplayName);
        }
    } 
}

然后在你看来，这是采取一种的IEnumerable＆LT;＆为MyModel GT; ，您可以使用它是这样的：

Then in your View, which is taking an IEnumerable<MyModel>, you can use it like this:

@using Web.Extensions
@model IEnumerable<MyModel>

<table>
    <tr>
        <th>
            @Html.DisplayNameFor(m => m.AvgElecCost)
        </th>

生成的HTML将是：

The generated HTML will be:

        <th>
            Some Property
        </th>

希望它帮助！

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