/// <summary>
/// 备份数据库数据
/// </summary>
/// <param name="dir"></param>
public void SetBackUP(string dir)
{
if (string.IsNullOrWhiteSpace(dir))
{
dir = db_backupdir;
}
BackupOptions options = new BackupOptions();
options.Creation = CreatePolicy.IF_NEEDED;
options.Files = true;
options.NoLogs = true;
env.Backup(dir, options);
}