您可以阅读以下有关编写自定义的文章DataAnnotationsModelMetadataProvider。
这是涉及新引入的IMetadataAware接口的另一种ASP.NET MVC 3ish更多方法。
public class PlaceHolderAttribute : Attribute, IMetadataAware
{
private readonly string _placeholder;
public PlaceHolderAttribute(string placeholder)
{
_placeholder = placeholder;
}
public void OnMetadataCreated(ModelMetadata Metadata)
{
Metadata.AdditionalValues["placeholder"] = _placeholder;
}
}
然后用它来装饰模型：
public class My@R_502_1107@l
{
[PlaceHolder("Enter title here")]
public string Title { get; set; }
}
接下来定义一个控制器：
public class HomeController : Controller
{
public ActionResult Index()
{
return View(new My@R_502_1107@l());
}
}
相应的视图：
@model My@R_502_1107@l
@using (Html.BeginForm())
{
@Html.EditorFor(x => x.Title)
<input type="submit" value="OK" />
}
最后是编辑器模板（~/Views/Shared/EditorTemplates/string.cshtml）：
@{
var placeholder = string.Empty;
if (ViewData.ModelMetadata.AdditionalValues.ContainsKey("placeholder"))
{
placeholder = ViewData.ModelMetadata.AdditionalValues["placeholder"] as string;
}
}
<span>
@Html.Label(ViewData.ModelMetadata.PropertyName)
@Html.Text@R_53_2419@("", ViewData.TemplateInfo.FormattedModelValue, new { placeholder = placeholder })
</span>
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