Filter：
 1     /// <summary>

     /// 检测是否是手机访问

     /// </summary>

     public class IsMobileFilter : ActionFilterAttribute

     {

         public override void OnActionExecuting(ActionExecutingContext filterContext)

         {

             System.Web.HttpBrowserCapabilitiesBase myBrowserCaps = filterContext.HttpContext.Request.Browser;

             bool flag = myBrowserCaps.IsMobileDevice;

             if (flag)

             {

                 string urls = "www.baidu.com";

                 if (!string.IsNullOrEmpty(urls))

                 {

                     urls = urls.Contains("http") ? urls.Trim() : "http://" + urls.Trim();

                     filterContext.Result = new RedirectResult(urls);

                 }

                 else

                 {

                     base.OnActionExecuting(filterContext);

                 }

             }

             else

             {

                 base.OnActionExecuting(filterContext);

             }

         }

     }

　　　　在FilterConfig中注册全局Filter　　　　

　　　　　　public static void RegisterGlobalFilters(GlobalFilterCollection filters)

        　{

            　　filters.Add(new IsMobileFilter());

        　}