How to: Create User-Defined Exceptions.
如何：创建用户定义的异常。
This is true for all built-in exceptions, but need not be true for user-defined exceptions (although it is a useful convention).
对于所有的内置异常都是如此，不过用户自定义异常就不一定了(尽管这是一个很有用的约定)。
Exceptions cannot be used as data members of user-defined types.
异常不能当作用户定义类型的数据成员使用。
The thresholds are defined in a threshold set, which is a list of Periodic Exceptions performance counters.
阈值在一个阈值集中定义，它是一个定期异常(Periodic Exceptions)性能计数器列表。
We can process both types of exceptions, the threshold exceptions that are user-defined and the event exceptions for deadlocks.
我们可以处理两种类型的异常：用户定义的阈值异常和针对死锁的事件异常。
Some exceptions are common and have been grouped into a set of pre-defined or system exceptions.
有些常见的异常被合并到一组预定义的异常或系统异常中。
The exceptions were described and defined.
对这些例外情况进行了描述和定义。
The exceptions were described and defined.
对这些例外情况进行了描述和定义。
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