mvc 添加過濾器並添加session緩存判斷

功能實現:

登陸時添加session緩存.判斷是否登陸過時.

1.判斷是否須要登陸判斷

public static AdminLoginUser GetAdminLoginUser()
{
#region 獲取當前登陸者信息
AdminLoginUser result = null;
try
{
if (HttpContext.Current.Session["User"] != null)
{
result = HttpContext.Current.Session["User"] as AdminLoginUser;
}
else
{
result = null;
}
}
catch (Exception ex)
{
//TTracer.WriteLog(ex.ToString());
}
return result;
#endregion
}

 

public class SessionAndAuthority : ActionFilterAttribute//ActionFilterAttribute是Action過濾類,該屬於會在執行一個action以前先執行.
    {
        //後臺登陸用戶
        protected AdminLoginUser adminloginUser
        {
            get
            {
                return Test1.Common.UserHelper.GetAdminLoginUser();
            }
        }

        /// <summary>
        /// 使用驗證時 [NoSign] 標註不須要登陸和權限驗證
        /// </summary>
        [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true)]
        public class NoSignAttribute : Attribute
        {
        }

        //操做是否須要判斷
        private static bool SkipNoSign(ActionExecutingContext actionContext)
        {
            return actionContext.ActionDescriptor.GetCustomAttributes(typeof(NoSignAttribute), true).Length == 1;//有NoSign屬性  true
        }

        //在執行操做方法以前 判斷登陸狀況和頁面權限
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (SkipNoSign(filterContext))//是否該類標記爲NoSign，若是是則不須要判斷
            {
                base.OnActionExecuting(filterContext);
                return;
            }

            #region 先判斷session
            if (null == adminloginUser)
            {
                //session 過時
                if (!filterContext.HttpContext.Request.IsAjaxRequest())
                {
                    // 請求跳轉到Tip頁面
                    filterContext.Result = new RedirectResult("/Home/Tip?state=0");
                }
                else
                {
                    //ajax請求 返回json格式提示
                    if (filterContext.HttpContext.Request.HttpMethod == "GET")
                    {
                        filterContext.Result = new RedirectResult("/Home/Tip?state=0");
                    }
                    else
                    {
                        ContentResult content = new ContentResult();
                        ResultMessage msg = new ResultMessage() { success = false, message = "登陸已過時，請從新登陸！" };
                        content.Content = msg.ToJson();
                        filterContext.Result = content;
                    }
                }
            }
            #endregion
        }
    }

 

 

2.登陸時添加緩存

HttpContext.Session["User"] = LoginUserInfo;

3.在 FilterConfig 添加過濾器 SessionAndAuthority