.Net MVC中定义全局过滤器及在Action中排除全局过滤器

蔚落 2022-05-19 03:18 271阅读 0赞

1，定义过滤器：

public class LoginJsonFilter : ActionFilterAttribute
        {
            public bool IsCheck { get; set; }//
            public override void OnActionExecuting(ActionExecutingContext filterContext)
            {
                if(!IsCheck)
                {
                    return;
                }
    
                User user = filterContext.RequestContext.HttpContext.Session["CurrentUser"] as User;
    
                if (user == null)
                {
                    if (IsAjax())
                    {
                        Result<bool> result = new Result<bool>();
                        result.Code = ResultCode.Failed;
                        result.Message = "未登录或者登录已经过期,请重新登录";
                        filterContext.Result = new JsonResult<Result<bool>>
                        {
                            Data = result,
                            ContentType = null,
                            ContentEncoding = null,
                            JsonRequestBehavior = JsonRequestBehavior.AllowGet
                        };
                        return;
                    }
                    else
                    {
                        filterContext.Result = new RedirectResult("/User/LoginView");
                        return;
                    }
                }
                else
                {
                    base.OnActionExecuting(filterContext);
                }
            }
    
            #region 是否是Ajax请求 + static bool IsAjax()
            /// <summary>
            /// 是否是Ajax请求
            /// </summary>
            /// <returns></returns>
            public static bool IsAjax()
            {
                return HttpContext.Current.Request.Headers["X-Requested-With"] == "XMLHttpRequest";
            }
            #endregion
        }

2，在App\_Start文件夹下添加FilterConfig类

public class FilterConfig
        {
            public static void RegisterGlobalFilters(GlobalFilterCollection filters)
            {
                filters.Add(new LoginJsonFilter(){ IsCheck = true});
            }
        }

3，在Global.asax中注册全局过滤器

protected void Application_Start()
            {
                FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            }

4，如果某Action中不想使用该过滤器，如登录页，则可以通过如下方式排除

[LoginJsonFilter(IsCheck =false)]
            public ActionResult LoginView()
            {
                return View();
            }