asp.net mvc - How to set values to ViewBag in ActionFilterAttribute ASP MVC 5?

Question

Hello I would like to create my custom ActionFilterAttribute for each controller in my application, this attribute should set some ViewBag values. Is ActionFilterAttribute would be fine for it and how to get access to viewbag in ActionFilterAttribute ?

Answer 1

You can do like this

public class SomeMsgAttribute : FilterAttribute, IResultFilter
{
        public void OnResultExecuted(ResultExecutedContext filterContext)
        {
        }

        public void OnResultExecuting(ResultExecutingContext filterContext)
        {
            filterContext.Controller.ViewBag.Msg= "Hello";
        }
}

Using:

[SomeMsg]
public ActionResult Index()
{
    return View();
}