asp.net MVC 4.0 Model元数据回顾——HtmlHelper的ModelMetadata

public static MvcHtmlString EditorForModel(this HtmlHelper html, string templateName, string htmlFieldName, object additionalViewData)
{
return MvcHtmlString.Create(TemplateHelpers.TemplateHelper(html, html.ViewData.ModelMetadata, htmlFieldName, templateName, DataBoundControlMode.Edit, additionalViewData));
}

1 public virtual ModelMetadata ModelMetadata
2 {
3     get
4     {
5         if (this._modelMetadata == null && this._model != null)
6         {
7             this._modelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => this._model, this._model.GetType());
8         }
9         return this._modelMetadata;
10     }
11     set
12     {
13         this._modelMetadata = value;
14     }
15 }