想知道为什么displayName属性为LabelFor忽略上覆盖的属性 [英] Wondering why DisplayName attribute is ignored in LabelFor on an overridden property

问题描述

结果
今天我做了几个＆LT时弄糊涂了;％= Html.LabelFor（M = GT; m.MyProperty）％GT; 在ASP.NET MVC 2和使用 [显示名称（显示此代替myProperty的）] 从属性 System.ComponentModel 。

today I got confused when doing a couple of <%=Html.LabelFor(m=>m.MyProperty)%> in ASP.NET MVC 2 and using the [DisplayName("Show this instead of MyProperty")] attribute from System.ComponentModel.

事实证明，当我把属性上覆盖的属性，LabelFor似乎没有注意到它。结果
但是， [必需] 属性工作正常上覆盖的属性，生成的errormessage的实际使用DisplayNameAttribute。

As it turned out, when I put the attribute on an overridden property, LabelFor didn't seem to notice it.
However, the [Required] attribute works fine on the overridden property, and the generated errormessage actually uses the DisplayNameAttribute.

这是一些简单的例子code，更现实的情况是，我已经从视图模型分开的databasemodel，但为了方便，我想从databasemodel继承，加上仅查看属性和装潢视图模型与UI的属性。

This is some trivial examplecode, the more realistic scenario is that I have a databasemodel separate from the viewmodel, but for convenience, I'd like to inherit from the databasemodel, add View-only properties and decorating the viewmodel with the attributes for the UI.

public class POCOWithoutDataAnnotations
{
    public virtual string PleaseOverrideMe { get; set; }        
} 
public class EditModel : POCOWithoutDataAnnotations
{
    [Required]
    [DisplayName("This should be as label for please override me!")]
    public override string PleaseOverrideMe 
    {
        get { return base.PleaseOverrideMe; }
        set { base.PleaseOverrideMe = value; }
    }

    [Required]
    [DisplayName("This property exists only in EditModel")]
    public string NonOverriddenProp { get; set; }
}

强类型的ViewPage＆LT; EditModel＆GT; 包含：

        <div class="editor-label">
            <%= Html.LabelFor(model => model.PleaseOverrideMe) %>
        </div>
        <div class="editor-field">
            <%= Html.TextBoxFor(model => model.PleaseOverrideMe) %>
            <%= Html.ValidationMessageFor(model => model.PleaseOverrideMe) %>
        </div>

        <div class="editor-label">
            <%= Html.LabelFor(model => model.NonOverriddenProp) %>
        </div>
        <div class="editor-field">
            <%= Html.TextBoxFor(model => model.NonOverriddenProp) %>
            <%= Html.ValidationMessageFor(model => model.NonOverriddenProp) %>
        </div>

然后将标签显示为PleaseOverrideMe的（不可以使用DisplayNameAttribute）和该酒店只有EditModel存在的（< STRONG>使用的DisplayNameAttribute）浏览页面时。结果
如果我发布具有空值，这种ActionMethod触发验证：

The labels are then displayed as "PleaseOverrideMe" (not using the DisplayNameAttribute) and "This property exists only in EditModel" (using the DisplayNameAttribute) when viewing the page.
If I post with empty values, triggering the validation with this ActionMethod:

    [HttpPost]
    public ActionResult Edit(EditModel model)
    {
        if (!ModelState.IsValid)
            return View(model);
        return View("Thanks");
    }

在＆LT;％= Html.ValidationMessageFor（型号=＆GT; model.PleaseOverrideMe）％GT; 实际上使用 [DisplayName的（这应该作为标签，请忽略我！）] 属性，并产生默认ERRORTEXT的的这应该是作为标签，请忽略我！是必填字段。的

the <%= Html.ValidationMessageFor(model => model.PleaseOverrideMe) %> actually uses [DisplayName("This should be as label for please override me!")] attribute, and produces the default errortext "The This should be as label for please override me! field is required."

请问一些友好的灵魂阐明这一些轻？

Would some friendly soul shed some light on this?

推荐答案

<一个href=\"https://connect.microsoft.com/VisualStudio/feedback/details/483001/in-asp-net-mvc-generic-try-updatemodel-methods-ignore-subtype-properties\">Model结合和使用强类型助手元数据着眼于声明，而不是运行时，该模型的类型。我认为这是一个错误，但显然MVC开发团队与我不同意，因为我对这个问题的连接被关闭为由设计。

Model binding and metadata using the strongly-typed helpers looks at the declared, rather than the runtime, type of the model. I consider this a bug, but apparently the MVC team disagrees with me, as my Connect issue on this was closed as "By Design."

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