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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