MVC 如何设定默认默认路由为指定的Area下的某个action（笔记）

感谢这篇博文的作者：http://blog.csdn.net/chenqiangdage/article/details/48136601

最近使用VS2015开发一个统一认证服务，想将API自己生成的帮助页面设置为默认页面。

示例：

namespace IOV.Authrize.Areas.HelpPage
{
    /// <summary>
    /// 帮助页面路由注册
    /// </summary>
    public class HelpPageAreaRegistration : AreaRegistration
    {
        /// <summary>
        /// 区域名称
        /// </summary>
        public override string AreaName
        {
            get
            {
                return "HelpPage";
            }
        }
        /// <summary>
        /// 注册
        /// </summary>
        /// <param name="context"></param>
        public override void RegisterArea(AreaRegistrationContext context)
        {
            context.MapRoute(
                "HelpPage_Default",
                "Help/{action}/{apiId}",
                new { controller = "Help", action = "Index", apiId = UrlParameter.Optional });

            HelpPageConfig.Register(GlobalConfiguration.Configuration);
        }
    }
}

　　修改RouteConfig代码为：

    public class RouteConfig
    {
        /// <summary>
        /// 注册路由
        /// </summary>
        /// <param name="routes"></param>
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
           "Default",
          "{controller}/{action}/{id}",
          new { controller = "Help", action = "Index", id = UrlParameter.Optional },
          new[] { "IOV.Authrize.Areas.HelpPage.HelpController" }
      ).DataTokens.Add("area", "HelpPage");
        }
    }