TransactedInstaller与嵌套安装程序

这是否有区别(嵌套安装程序)

ServiceInstaller si = new ServiceInstaller();
si.ServiceName = "MyService";

ServiceProcessInstaller spi = new ServiceProcessInstaller();
spi.Account = ServiceAccount.LocalSystem;

spi.Installers.Add(si);

this.Installers.Add(spi);  

还有这个？(TransactedInstaller)

TransactedInstaller ti = new TransactedInstaller();

ServiceInstaller si = new ServiceInstaller();
si.ServiceName = "MyService";
ti.Installers.Add(si);

ServiceProcessInstaller spi = new ServiceProcessInstaller();
spi.Account = ServiceAccount.LocalSystem;
ti.Installers.Add(spi);

this.Installers.Add(ti);   

嵌套安装程序是否默认处理？应该选择哪种款式？

如果自定义操作成功/失败, TransactedInstaller将自动调用Commit/Rollback.

使用嵌套安装程序,您将需要在发生错误的情况下对回滚/提交您自己进行排序,如果您没有明确告诉它们运行,则不会调用它们.