asp.net mvc 中通过url字符串获取controller和action

string conroller = string.Empty;
string action = string.Empty;
HttpRequest hr = new HttpRequest("", url, "");//这里的url就是要解析的url
TextWriter stringWriter = new StringWriter();
HttpResponse hrs = new HttpResponse(stringWriter);
HttpContext hc = new HttpContext(hr, hrs);
HttpContextWrapper hcw = new HttpContextWrapper(hc);

foreach (Route r in System.Web.Routing.RouteTable.Routes)
{
　　RouteData rt = r.GetRouteData(hcw);
　　if (rt != null)
　　{
　　　　conroller = rt.Values["Controller"].ToString();//解析出来的Controller
　　　　action = rt.Values["Action"].ToString();//解析出来的Action
　　　　break;
　　}
} 

using System.IO;
using System.Web.Routing;