Get absolute URL path of an action from within Global.asax

Question

Sorry for the basic question.

From within the Global.asax, I want to get the absolute path to a controller's action, like we get by calling Response.Redirect("~/subfolder") from anywhere or by calling @Url.Content("~/controller/action") from within our views.

In my Global.asax events, I'd like to do something like this:

protected void Application_BeginRequest(object sender, EventArgs args)
{
  if ( string.Compare(HttpContext.Current.Request.RawUrl, "~/foo", true) == 0 )
    // do something

    // I'd like the "~foo" to resolve to the virtual path relative to 
    // the application root
}

Answer 1

Here is the answer for your problem

You can simply get the controller and action name like this

protected void Application_BeginRequest(object sender, EventArgs args)
{
    HttpContextBase currentContext = new HttpContextWrapper(HttpContext.Current);
    UrlHelper urlHelper = new UrlHelper(HttpContext.Current.Request.RequestContext);
    RouteData routeData = urlHelper.RouteCollection.GetRouteData(currentContext);
    string action = routeData.Values["action"] as string;
    string controller = routeData.Values["controller"] as string;

  if (string.Compare(controller, "foo", true) == 0)
    // do something

    // if the controller for current request if foo
}

Answer 2

How to check the Session Timeout

void Session_Start(object sender, EventArgs e)
{
    if (Session.IsNewSession && Session["SessionExpire"] == null)
    {
        //Your code
    }
}

You have many options to do this. But I will not recommend to use Global.asax place to do such comparisons

Option - 1

This is also very important approach. You can use HttpModule.

Option - 2

Base Controller class

Option - 3

You can apply the Action Filter to an entire Controller class like below

namespace MvcApplication1.Controllers
{
     [MyActionFilter]
     public class HomeController : Controller
     {
          public ActionResult Index()
          {
               return View();
          }

          public ActionResult About()
          {

               return View();
          }
     }
}

Whenever any of the actions exposed by the Home controller are invoked – either the Index() method or the About() method, the Action Filter class will execute first.

namespace MvcApplication1.ActionFilters
{
     public class MyActionFilter : ActionFilterAttribute
     {
          public override void OnActionExecuting(ActionExecutingContext filterContext)
          {
                 //Your code for comparison
          }    
     }
}

If you pay attention to the above code, the OnActionExecuting will execute before executing the Action Method

Option - 4

Using this approach will execute the OnActionExecuting for Index method only.

namespace MvcApplication1.Controllers
{
     public class DataController : Controller
     {
          [MyActionFilter]
          public string Index()
          {
                 //Your code for comparison    
          }
     }
}

How to get the current request DataTokens

RouteData.Values["controller"] //to get the current Controller Name
RouteData.Values["action"]     //to get the current action Name