即使WLM没有显式地使用服务类(即数据库管理员没有定义任何服务类)，所有用户事务都是在预定义的服务类上下文中执行的。

Even if WLM is not explicitly used (that is, no service classes are defined by the database administrator), all user transactions are executed within the context of the predefined service class.

youdao

LINQ to SQL同样支持显式设置上下文的事务，所以您可以获取上下文的数据库连接，然后打开它，开启一个事务，并在上下文中设置。

LINQ to SQL also supports explicitly setting the transaction on the context, so you could get the connection from the context, open it, start a transaction, and set it on the context.

youdao