Completes This Version Block 做好这个版块
Use the explicit block version instead.
应使用显式的代码块来代替。
The row version takes one argument, a string, and an optional block.
row 版本将获取一个实参、字符串和可选块。
As a consequence, Close takes a Timeout and has an async version (since it can block), and also Close can throw Exceptions.
因此,Close方法会接收一个Timeout参数,并包括一个异步版本(因为它可能阻塞线程),而且Close还会抛出异常。
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