/// <summary>
    /// 自定義行為過濾器，實現(xiàn)登錄及權(quán)限的驗證
    /// </summary>
    public class SystemAuthorizeFilter : IActionFilter
    {
        public void OnActionExecuted(ActionExecutedContext context)
        {
            //throw new NotImplementedException();
        }

        /// <summary>
        /// 在執(zhí)行控制器中的Action方法之前執(zhí)行該方法  判斷當前用戶是否登錄
        /// </summary>
        /// <param name="context"></param>
        public void OnActionExecuting(ActionExecutingContext context)
        {　　　　　　　 //排除可以匿名訪問的  未登錄時
            if (HasAllow(context) == false && context.HttpContext.Session.GetString("User") == null)
            {
                bool isAjax = IsAjax(context.HttpContext.Request);

                //如果是Ajax請求自定義返回json
                if (isAjax)
                {
                    context.Result = new JsonResult(new { Code = 401, Msg = "登錄已失效，請重新登錄2！" }) { 
                        StatusCode=StatusCodes.Status401Unauthorized
                    };
                }
                else
                {
                    ContentResult Content = new ContentResult();
                    Content.Content = "<script type='text/javascript'>alert('登錄已失效，請重新登錄！'); top.location.href='/Login/Login';</script>";
                    Content.ContentType = "text/html;charset=utf-8";
                    context.Result = Content;
                }
            }
        }
        /// <summary>
        /// 排除掉控制器不需要鑒權(quán)  即加[AllowAnonymous]特性的無需鑒權(quán)
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public static bool HasAllow(ActionExecutingContext context)
        {
            var filters = context.Filters;
            if (filters.OfType<IAllowAnonymousFilter>().Any())
            {
                return true;
            }
            var endpoint = context.HttpContext.GetEndpoint();
            return endpoint?.Metadata?.GetMetadata<IAllowAnonymous>() != null;
        }

        /// <summary>
        /// 判斷是否是Ajax請求
        /// </summary>
        /// <param name="req"></param>
        /// <returns></returns>
        public static bool IsAjax(HttpRequest req)
        {
            bool result = false;
            var xreq = req.Headers.ContainsKey("x-requested-with");
            if (xreq)
            {
                result = req.Headers["x-requested-with"] == "XMLHttpRequest";
            }
            return result;
        }
    }

2、在Startup的ConfigureServices中添加

//配置系統(tǒng)過濾器
            services.AddControllersWithViews().AddMvcOptions(options =>
            {
                //自定義行為過濾器的方式，驗證是否登錄及用戶權(quán)限
                options.Filters.Add<SystemAuthorizeFilter>();
            }).AddNewtonsoftJson(options=> {
                //全局日期格式化
                options.SerializerSettings.DateFormatString = "yyyy-MM-dd HH:mm:ss";
                //返回的Json大小寫原樣輸出
                options.SerializerSettings.ContractResolver = new DefaultContractResolver();
            });

3、在登錄控制器如：LoginController.cs 或不需要鑒權(quán)的控制器或方法上添加[AllowAnonymous] 特性即可。

4、在頁面上Ajax請求中加入判斷如果返回的為401時給予提示并跳轉(zhuǎn)至登錄頁面

$.ajax({
            type: "POST",
            data: "",
            async: false,
            dataType: "json",
            url: "",
            beforeSend: function () {
            },
            success: function (data) {
                if (data.Code != null && data.Code != "undefined" && data.Code == 401) {　　　　　　　　　　　　alert('登錄已失效，請重新登錄！'); top.location.href='/Login/Login';　　　　　　　　　 }                 console.log(data);             },             complete: function () { },             error: function (data) { }         });

二、自定義身份驗證過濾器

新建CustomAuthorizeFilter過濾器繼承自 IAuthorizationFilter

/// <summary>
    /// 自定義身份驗證過濾器，實現(xiàn)登錄及權(quán)限的驗證
    /// </summary>
    public class CustomAuthorizeFilter : IAuthorizationFilter
    {
        public void OnAuthorization(AuthorizationFilterContext context)
        {
            //如果需要授權(quán) 但未登錄
            if (HasAllowAnonymous(context) == false && context.HttpContext.Session.GetString("User") == null)
            {
                bool isAjax = IsAjax(context.HttpContext.Request);

                //如果是Ajax請求自定義返回json
                if (isAjax)
                {
                    context.Result = new JsonResult(new { Code = 401, Msg = "登錄已失效，請重新登錄2！" })
                    {
                        StatusCode = StatusCodes.Status401Unauthorized
                    };
                }
                else
                {
                    ContentResult Content = new ContentResult();
                    Content.Content = "<script type='text/javascript'> alert('登錄已失效，請重新登錄！'); top.location.href='/Login/Login'; </script>";
                    Content.ContentType = "text/html;charset=utf-8";
                    context.Result = Content;
                }               
            }
        }

        /// <summary>
        /// 排除掉控制器不需要鑒權(quán)的 
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        private static bool HasAllowAnonymous(AuthorizationFilterContext context)
        {
            var filters = context.Filters;
            if (filters.OfType<IAllowAnonymousFilter>().Any())
            {
                return true;
            }
            var endpoint = context.HttpContext.GetEndpoint();
            return endpoint?.Metadata?.GetMetadata<IAllowAnonymous>() != null;
        }
        /// <summary>
        /// 判斷是否是Ajax請求
        /// </summary>
        /// <param name="req"></param>
        /// <returns></returns>
        public static bool IsAjax(HttpRequest req)
        {
            bool result = false;
            var xreq = req.Headers.ContainsKey("x-requested-with");
            if (xreq)
            {
                result = req.Headers["x-requested-with"] == "XMLHttpRequest";
            }
            return result;
        }

    }

使用方式同上，不需要鑒權(quán)的控制器或方法上添加[AllowAnonymous] 特性即可。

三、新建BaseController在OnActionExecuting中實現(xiàn)

在BaseController中重寫OnActionExecuting方法

/// <summary>
        /// 在執(zhí)行控制器中的Action方法之前執(zhí)行該方法  判斷當前用戶是否登錄
        /// </summary>
        /// <param name="context"></param>
        public override void OnActionExecuting(ActionExecutingContext context)
        {
            if (context.HttpContext.Session.GetString("User")==null)
            {
                //context.Result = Redirect("/Login/Login");

                ContentResult Content = new ContentResult();
                Content.Content= "<script type='text/javascript'>alert('登錄已失效，請重新登錄！');top.location.href='/Login/Login'</script>";
                Content.ContentType = "text/html;charset=utf-8";
                context.Result = Content;

                return;
            }
        }

其他的修改可參考上面兩種做補充，在需要鑒權(quán)的控制器上集成該BaseController即可。

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