HttpActionContext could not be found after I upgraded a web API

I upgraded a web API in .NET Framework 4.6 to 8.0 web API Core and got an error message from the IsAuthorized method:

The type or namespace name 'HttpActionContext' could not be found (are you missing a using directive or an assembly reference?)

public class CustomApiAuthorizeAttribute : AuthorizeAttribute
{
    [Inject]

    public IUnitOfWork UnitOfWork { private get; set; }

    protected override bool IsAuthorized(HttpActionContext actionContext)
    {
        var principal = actionContext.RequestContext.Principal;

        if (!principal.Identity.IsAuthenticated)

            return false;

        return UnitOfWork.IsUserAuthorized(principal.Identity.Name.Substring(5));
    }
}

How can I resolve this?

You can achieve that by using filters:

public class CustomApiAuthorizeAttribute :Attribute, IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationFilterContext context)
    {
        if(context.HttpContext.User.Identity != null && context.HttpContext.User.Identity.IsAuthenticated)
        {
            // do your work
        }
    }
}