By the time you catch an exception, you have no record of where the exception was thrown.

当你捕获到一个异常时，你甚至不知道这个异常是从哪个地方抛出的。

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The Update and Delete buttons use exception handlers to display the error message if something goes wrong (such as referential integrity violations when deleting a record).

如果发生错误(例如删除记录时违反了参照完整性)，Update和Delete按钮则使用异常处理程序来显示出错消息。

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As shown in the code snippet below, this requires keeping a counter so you know when to commit and write a log record, taking care not to count rows that cause an exception.

如下面的代码段所示，这需要维护一个计数器，以便能够知道什么时候进行提交并写日志记录，这个计数器不考虑导致异常的行。

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The purpose of this attribute is to give an explicit way to record the cause of an exception.

这个属性的作用是以一种显式方法记录异常的原因。

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The purpose of this attribute is to give an explicit way to record the cause of an exception.

这个属性的作用是以一种显式方法记录异常的原因。

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