C# SMO修复花费了很长时间

我使用此SMO恢复备份：

        Server myServer = new Server(@"PC-1\Instance1");
        Restore restoreDB = new Restore();
        restoreDB.Database = "Sample";
        restoreDB.Action = RestoreActionType.Database;
        restoreDB.Devices.AddDevice(@"D:\Sample.bak", DeviceType.File);
        restoreDB.ReplaceDatabase = true;
        restoreDB.NoRecovery = true;
        restoreDB.SqlRestore(myServer);

但当我打开SSMS时，恢复需要花费很长时间

我用它来备份数据库，并且能够备份数据库

            Server myServer = new Server(@"PC-1\Instance1");
            Backup bkpDBFull = new Backup();
            bkpDBFull.Action = BackupActionType.Database;
            bkpDBFull.Database = "Sample";
            bkpDBFull.Devices.AddDevice(@"D:\Sample.bak", DeviceType.File);
            bkpDBFull.BackupSetName = "Sample";
            bkpDBFull.BackupSetDescription = "Sample";
            bkpDBFull.ExpirationDate = DateTime.Today.AddDays(5);
            bkpDBFull.Initialize = false;
            bkpDBFull.SqlBackup(myServer);

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代码中有以下行：

restoreDB.NoRecovery = true;

因此，在运行之前，数据库将永远在SSMS中显示为正在恢复

RESTORE DATABASE [sample] WITH RECOVERY

或者它的SMO等价物，我不确定到底是什么