Create a class in the WEB project:
public class LoginFilter : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
//HttpContext.Current.Response.Write("OnActionExecuting: Execute when the Action is about to be executed but not executed <br />");
if (HttpContext.Current.Session"admin" == null)
{
//HttpContext.Current.Response.Write("js code");
//HttpContext.Current.Response.End();
//return;
var context = new ContentResult();
context.Content = "<script>alert( 'Please log in again!');location.href='/Login/Index'</script>";
filterContext.Result = context;
//HttpContext.Current.Response.End();
//return;
var context = new ContentResult();
context.Content = "<script>alert( 'Please log in again!');location.href='/Login/Index'</script>";
filterContext.Result = context;
}
}
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
//HttpContext.Current.Response.Write("OnActionExecuted: Executed when the Action executes but has not returned the result<br />");
}
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
// HttpContext.Current.Response.Write("OnResultExecuting:OnResultExecuting is also the same as OnActionExecuted, but the former is executed after the latter is executed<br />");
}
public override void OnResultExecuted(ResultExecutedContext filterContext)
{
// HttpContext.Current.Response.Write("OnResultExecuted: is executed when the ActionResult will be returned after the Action is executed<br />");
}
}
To use the method, write directly outside the method in the control, such as:
[LoginFilter]
public ActionResult Add()
{
Model.Userinfo loginuser = base.GetLoginUser();
Model.Product pro = new Model.Product() { userid = loginuser.id, username = loginuser.username };
return View(pro);
}