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();
}

Answer 2

try this

public class CustomFilterAttribute : ActionFilterAttribute
{
    public override void
    OnActionExecuting(ActionExecutingContext filterContext)
    {
        //  get the view bag

        var viewBag = filterContext.Controller.ViewBag;

        // set the viewbag values
        viewBag.CustomValue = "CustomValue";
    }
}

Answer 3

For ASP.NET Core you can do the following

public class SomeFilterAttribute : IActionFilter
{
     public void OnActionExecuting(ActionExecutingContext context)
     {
         Controller controller = context.Controller as Controller;

         controller.ViewBag.CustomValue = customVal;
         controller.ViewData["CustomValue "] = customVal;
         controller.TempData["CustomValue "] = customVal;
     }
}

Then from the controller

    [TypeFilter(typeof(ValidateAppFeatureEnabled))]
    public IActionResult Index()
    {
        var foo = ViewBag.CustomValue;
        var bar = (type)ViewData["CustomValue"];
        var buzz = (type)TempData["CustomValue"];

        // Whatever else you need to do

        return View();
    }

Answer 4

To transfer data from a different controller action

public override void OnActionExecuting(ActionExecutingContext filterContext)
{
    EmployeeTrackingSystemAndMISEntities db = new EmployeeTrackingSystemAndMISEntities();

    var UserCookie = filterContext.HttpContext.Request.Cookies["UserUniqueID"];


    RouteValueDictionary redirectTargetDictionary = new RouteValueDictionary();
    redirectTargetDictionary.Add("action", "UserLogIn");
    redirectTargetDictionary.Add("controller", "Login");

    var TempData = filterContext.Controller.TempData;
    TempData["Status"] = "Please log in as Admin";

    filterContext.Result = new RedirectToRouteResult(redirectTargetDictionary);

}