ASP.NET 4.0 URL Routing HTTP Error 404.0 - Not Found

在ASP.NET Web API项目中的路由注册代码如下：

public static void RegisterRoutes(RouteCollection routes)
{
     routes.MapHttpRoute(
         name: "DefaultApi",
         routeTemplate: "api/{controller}/{filename}",
         defaults: new { filename = RouteParameter.Optional }
     );
}

当访问地址突然出现了如下错误：

解决方法：

1、确认启用了IIS的 HTTP Redirection

2、在web.config中启用asp.net 4.0 routing：

  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="UrlRoutingModule"/>
      <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      <remove name="WebDAVModule" /> </modules>
    <handlers>
      <add name="UrlRoutingHandler" preCondition="integratedMode" verb="*" path="UrlRouting.axd" type="System.Web.HttpForbiddenHandler, System.Web,
Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a"/>
      <remove name="WebDAV" />
    </handlers> 
  </system.webServer>

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