Microsoft Sync Framework两种方式同步问题

Question

我尝试使用Microsoft同步框架在两个SQl服务器数据库之间同步数据，但它只以一种方式同步，任何建议？

 SqlSyncProvider sqlProviderLocal = new SqlSyncProvider(downloadScope, sqlConnLocal);
        SqlSyncProvider sqlProviderRemote = new SqlSyncProvider(downloadScope, sqlConnRemote);
        SqlSyncScopeProvisioning scopeProvisionLocal = new SqlSyncScopeProvisioning(sqlConnLocal);
        SqlSyncScopeProvisioning scopeProvisionRemote = new SqlSyncScopeProvisioning(sqlConnRemote);
        scopeProvisionLocal.ObjectSchema = ".dbo";
        scopeProvisionRemote.ObjectSchema = ".dbo";
        string[] tablesToSync = ConfigurationManager.AppSettings["SyncTablesDownloadFromRemote"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

        if (!scopeProvisionLocal.ScopeExists(downloadScope))
        {
            DbSyncScopeDescription scopeDesc = new DbSyncScopeDescription(downloadScope);

            for (int i = 0; i < Tables.Length; i++)
            {

                scopeDesc.Tables.Add(SqlSyncDescriptionBuilder.GetDescriptionForTable(Tables[i], sqlConnLocal));
            }

            scopeProvisionLocal.PopulateFromScopeDescription(scopeDesc);
            scopeProvisionLocal.SetCreateTableDefault(DbSyncCreationOption.Skip);
            scopeProvisionLocal.Apply();
        }

        if (!scopeProvisionRemote.ScopeExists(downloadScope))
        {
            DbSyncScopeDescription scopeDesc = SqlSyncDescriptionBuilder.GetDescriptionForScope(downloadScope, sqlConnLocal);
            scopeProvisionRemote.PopulateFromScopeDescription(scopeDesc);
            scopeProvisionRemote.Apply();
        }

        agent.LocalProvider = sqlProviderLocal;
        agent.RemoteProvider = sqlProviderRemote;


        agent.Direction = SyncDirectionOrder.DownloadAndUpload;
        SyncOperationStatistics Uploadstats = agent.Synchronize();