Question

When a view has been rendered in memory and before it is sent as a response to the client, I would like to intercept the call, check which view is being rendered, what was the action and controller, and do some house-keeping.

Therefore, I am implementing a ResultFilter and overriding the OnResultExecuted method.

Within this method, how do I get the route data to figure out which view, action, controller were called?

Update
My profuse apologies. I just looked up ResultExecutedContext in reflector and it showed me only an Exception, Cancelled and ActionResult property. It didn’t show me any RouteData. When I fired up the IDE, it did show me the route data. I feel like a dick for asking this question.

Answer 1

You could get it from the filterContext‘s RouteData property:

public override void OnResultExecuted(ResultExecutedContext filterContext)
{
    RouteData rd = filterContext.RouteData;
    // read from the current request RouteData the information
    // you were looking for. For example to get the current controller
    // and action:
    string currentController = rd.GetRequiredString("controller");
    string currentAction = rd.GetRequiredString("action");
}

As far as which view was rendered is concerned you could retrieve this information from the Result property:

var viewResult = filterContext.Result as ViewResultBase;
if (viewResult != null)
{
    // the controller action returned a view result (either a ViewResult or PartialViewResult)
    // so we could retrieve the view name here:
    string viewName = viewResult.ViewName;
}

If on the other hand the controller action returned a JsonResult you could also extract retrieve it:

var jsonResult = filterContext.Result as JsonResult;

and so on…