C#中this用法
查看mvc的源代码,看到这种写法
public static string RouteLink(this AjaxHelper ajaxHelper, string linkText, object routeValues, AjaxOptions ajaxOptions) { return RouteLink(ajaxHelper, linkText, null /* routeName */, new RouteValueDictionary(routeValues), ajaxOptions, new Dictionary<string, object>()); }