C# MessageCollection.UpdateMulti方法代码示例

        /// <summary>
        /// Deletes the user with the ID passed in. Will reset all posts made by the user to the userid 0. 
        /// </summary>
        /// <param name="userID">The user ID.</param>
        /// <remarks>Can't delete user 0</remarks>
        /// <returns>true if succeeded, false otherwise</returns>
        public static bool DeleteUser(int userID)
        {
            if(userID == 0)
            {
                // can't delete the Anonymous coward user.
                return false;
            }

            UserEntity toDelete = UserGuiHelper.GetUser(userID);
            if(toDelete==null)
            {
                // user doesn't exist
                return false;
            }

            // all actions have to take place in a transaction.
            Transaction trans = new Transaction(IsolationLevel.ReadCommitted, "DeleteUser");

            try
            {
                // we'll first update all PostedByUserId fields of all messages which are posted by the user to delete.
                MessageEntity messageUpdater = new MessageEntity();
                messageUpdater.PostedByUserID = 0;	// reset to AC.
                MessageCollection messages = new MessageCollection();
                trans.Add(messages);	// add to the transaction
                // update all entities directly in the DB, which match the following filter and update them with the new values set in messageUpdater.
                messages.UpdateMulti(messageUpdater, (MessageFields.PostedByUserID == userID));

                // set the startuser of threads started by this user to 0
                ThreadEntity threadUpdater = new ThreadEntity();
                threadUpdater.StartedByUserID = 0;
                ThreadCollection threads = new ThreadCollection();
                trans.Add(threads);
                threads.UpdateMulti(threadUpdater, (ThreadFields.StartedByUserID == userID));

                // remove the user from the UserRoles set, as the user shouldn't be in any roles.
                RoleUserCollection roleUsersDeleter = new RoleUserCollection();
                trans.Add(roleUsersDeleter);
                // delete all entities directly from the DB which match the following filter.
                roleUsersDeleter.DeleteMulti(RoleUserFields.UserID == userID);

                // delete all bookmarks of user
                BookmarkCollection bookmarkDeleter = new BookmarkCollection();
                trans.Add(bookmarkDeleter);
                // delete all bookmarks for this user directly from the DB using the following filter.
                bookmarkDeleter.DeleteMulti(BookmarkFields.UserID == userID);

                // delete all audit data
                AuditDataCoreCollection auditDataDeleter = new AuditDataCoreCollection();
                // first fetch it, then delete all entities from the collection, as the audit data is in an inheritance hierarchy of TargetPerEntity which can't
                // be deleted directly from the db.
                trans.Add(auditDataDeleter);
                auditDataDeleter.GetMulti(AuditDataCoreFields.UserID == userID);
                auditDataDeleter.DeleteMulti();

                // set IP bans set by this user to userid 0
                IPBanEntity ipbanUpdater = new IPBanEntity();
                ipbanUpdater.IPBanSetByUserID = 0;
                IPBanCollection ipBans = new IPBanCollection();
                trans.Add(ipBans);
                ipBans.UpdateMulti(ipbanUpdater, (IPBanFields.IPBanSetByUserID == userID));

                // delete threadsubscriptions
                ThreadSubscriptionCollection threadSubscriptionsDeleter = new ThreadSubscriptionCollection();
                trans.Add(threadSubscriptionsDeleter);
                threadSubscriptionsDeleter.DeleteMulti(ThreadSubscriptionFields.UserID == userID);

                // remove supportqueuethread claims
                SupportQueueThreadCollection supportQueueThreads = new SupportQueueThreadCollection();
                trans.Add(supportQueueThreads);
                supportQueueThreads.DeleteMulti(SupportQueueThreadFields.ClaimedByUserID == userID);

                // set all placed in queue references to userid 0, so the threads stay in the queues.
                SupportQueueThreadEntity supportQueueThreadUpdater = new SupportQueueThreadEntity();
                supportQueueThreadUpdater.PlacedInQueueByUserID=0;
                supportQueueThreads.UpdateMulti(supportQueueThreadUpdater, (SupportQueueThreadFields.PlacedInQueueByUserID == userID));

                // now delete the actual user entity
                trans.Add(toDelete);
                toDelete.Delete();

                // all done
                trans.Commit();
                return true;
            }
            catch
            {
                trans.Rollback();
                throw;
            }
            finally
            {
                trans.Dispose();
            }
//.........这里部分代码省略.........