Is it possible to redirect to another action using a custom action filter?

I'm not familiar with ASP.NET Core actions' custom filter attribute. I need to redirect to another action in case some data does not exist using a custom method filter.

Here is my attempt:

[AttributeUsage(AttributeTargets.Class| AttributeTargets.Method, AllowMultiple = false)]
public class IsCompanyExistAttribute: ActionFilterAttribute
{
    private readonly ApplicationDbContext context;

    public IsCompanyExistAttribute(ApplicationDbContext context)
    {
        this.context = context;
    }

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        //base.OnActionExecuting(filterContext);
        if (context.Companies == null)
        {
            return RedirectToAction(actionName: "Msg", controllerName: "Account", 
                new { message = "You are not allowed to register, since the company data not exist !!!" });
        }
    }

I didn't use filterContext. The RedirectToAction line appears as an error (with a red underline), of course, since it's a void method, not an action result. As I mentioned I'm not familiar with custom filters.

Any help, please?

Yes, it is. Simply set the Result property of the ActionExecutingContext instance to your RedirectToActionResult. It should look something like the following:

 public override void OnActionExecuting(ActionExecutingContext filterContext)
 {
     var controller = filterContext.Controller as ControllerBase; 
     if (context.Companies == null && controller != null)
     {
         filterContext.Result = controller.RedirectToAction(
             actionName: "Msg", 
             controllerName: "Account", 
             new { message = "You are not allowed to register, since the company data not exist !!!" }
         );
     }
     base.OnActionExecuting(filterContext);
 }