高效的Session读写.

private static User currentUser = null;
        /**//// <summary>
        /// 当前用户
        /// </summary>
        public static User CurrentUser{
            get{
                if(currentUser != null && HttpContext.Current.Session["LoginUser"] != null)
                    return currentUser;
                
                if(HttpContext.Current.Session["LoginUser"] != null){
                    currentUser = (User)HttpContext.Current.Session["LoginUser"];
                    return currentUser;
                }

                if(currentUser != null && HttpContext.Current.Session["LoginUser"] == null){
                    return currentUser;
                }
                //没有登陆的用户,自动读取cookie登陆
                currentUser = new PopForum.Common.Entity.User();
                HttpCookie c = HttpContext.Current.Request.Cookies["UserInfo"];
                if(c!=null && c.Value!=""){
                    FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(c.Value);
                    Common.DataMapping.UserInfo info = null;
                    Users users = new Users();
                    int r = users.CheckUser(ticket.Name,out info);
                    if(r==1){
                        currentUser.UserId = info.UserId;
                        currentUser.UserName = info.UserName;
                        currentUser.Status = (Common.UserStatus)info.UserStatus;
                        currentUser.Point = info.Point;
                        DataTable table = DataBase.ExecuteSQLTable("select rr.rightid from t_roleright rr,t_userrole ur where rr.roleid=ur.roleid and ur.userid="+currentUser.UserId.ToString());
                        foreach(DataRow row in table.Rows){
                            currentUser.Rights.Add((Common.Right)row["rightid"]);
                        }
                        //判断用户是否有系统管理权限
                        if(currentUser.HaveRight(Common.Right.SiteAdmin)){
                            //更新用户登陆信息
                            users.LoginUpdate(ref info,currentUser);
                            currentUser.Point = info.Point;
                            Sessioner.Add("LoginUser",currentUser);
                        }
                            //判断网站是否关闭，但管理员可以登陆
                        else if(Common.Configs.ForumConfig.SiteConfiger.CloseFlag){
                            throw new CtyException("网站被关闭,暂时无法访问",DealType.RediretErrorPage);
                        }
//                            //判断是否允许登陆
//                        else if(!Common.Configs.ForumConfig.SiteConfiger.LoginFlag){
//                            throw new CtyException("登陆被禁止,暂时无法登陆",DealType.RediretErrorPage);
//                        }
                        else{
                            users.LoginUpdate(ref info,currentUser);
                            currentUser.Point = info.Point;
                            Sessioner.Add("LoginUser",currentUser);
                        }
                    }
                }else{
                    //匿名用户
                    if(!Common.Configs.ForumConfig.SiteConfiger.AnonymousFlag)
                        throw new CtyException("网站不允许匿名用户访问",DealType.RediretErrorPage);
                }
                return currentUser;
            }set{
                 Sessioner.Add("LoginUser",value);
                 currentUser = value;
             }
        }