System.Web.Mvc.Html空间API
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FormExtensions：<form></form>
InputExtensions:CheckBox Hidden Password RadioButton TextBox
LinkExtensions:ActionLink RouteLink
RenderPartialExtensions:RenderPartial
SelectExtensions:DropDownList ListBox
TextAreaExtensions:TextArea
ValidationExtensions:ValidationMessage ValidationSummary
注：这些类中的方法都是HtmlHelp类的扩展方法，他的第一个参数声明形式是：this HtmlHelp htmlHelp;
AjaxHelper类也有类似的扩展方法
