关于alerts的问题

Question

                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    using (SPSite site = new SPSite(url))
                    {
                        using (SPWeb web = site.OpenWeb(new Guid(ViewState["groupid"].ToString())))
                        {
                            SPUser user = SPContext.Current.Web.CurrentUser;                           
                            web.AllowUnsafeUpdates = true;
                           
                            Guid wikiGuid = new Guid(ViewState["wid"].ToString());
                            SPList list = web.Lists[wikiGuid];
                            SPListItem item = list.GetItemById(itemid);
                            SPAlert a = user.Alerts.Add();
                            a.Title = list.Title + ":" + item.Name;
                            a.Status = SPAlertStatus.On;
                            a.EventType = SPEventType.All;
                            a.AlertType = SPAlertType.Item;
                            a.AlertFrequency = SPAlertFrequency.Immediate;
                            a.Item = item;//单独写个测试demo完全没有问题，但是在正式项目里面这句话会抛出下面的异常，这是为什么
                            a.Update();

                         //web.Update();
                        }
                    }
                });

SPException was unhandled by user code

List does not exist

The page you selected contains a list that does not exist.  It may have been deleted by another user.

 

我不知道这是问什么，但是这个list和page肯定是存在的

Answer 1

我发现了 spuser必须这样获取才能添加alerts

SPUser user = web.AllUsers[SPContext.Current.Web.CurrentUser.LoginName];

这是为什么？

 根据LoginName去找他自己？