SignalR中获取cookie的解决方法

普通类中： 

            HttpCookie cookie = new HttpCookie(CookieKeyCometUserName);
            cookie.Name = CookieKeyCometUserName;
            cookie.Value = userName;
            cookie.Expires = SystemTime.Now().AddDays(1);   // 不加这句，就读不到，不知何故？

            HttpContext.Current.Response.Cookies.Add(cookie);

Hub方法中：

            HttpCookie cookie = HttpContext.Current.Request.Cookies[CookieKeyCometUserName];
            if (cookie != null)
            {
                return cookie.Value.DESDecrypt();
            }
            return "";