C# MVC4 执行特性之后不再执行Action

关键地方， 在OnActionExecuting函数中，不能使用filterContext.HttpContext.Response.Redirect(url)来定向，打断点可以发现一样会执行action里面代码。应该设置filterContext.Result来控制转向。

                    string returnUrl = HttpContext.Current.Request.Url.PathAndQuery;
                    var url = FormsAuthentication.LoginUrl + "?returnUrl=" + HttpUtility.UrlEncode(returnUrl);
                    //HttpContext.Current.Response.Redirect(url, true);//进入action
                    //filterContext.HttpContext.Response.Redirect(url);//进入action
                    /*filterContext.Result = new RedirectToRouteResult( //不进入action
                    new RouteValueDictionary
                    {
                        { "action", "Login" },
                        { "controller", "Admin" },
                        {"returnUrl", returnUrl}
                    });*/
                    filterContext.Result = new RedirectResult(url);//不进入action，转到登录页面。