如何：在调试器中监视表达式。
基本上，他们似乎是被筛选器表达式和关联谓词的用途、各种事件交付选项以及监视上下文中驱动更新的方式难住了。
Mostly they seem puzzled by the purpose of filter expressions and correlation predicates, by the various event delivery options, and by the way in which updates are driven in a monitoring context.
当指定表达式的值改变时，监视点将中断程序执行，但必须在表达式中所使用的变量在作用域中时设置监视点。
A watchpoint will break program execution when the specified expression changes value, but it must be set when the variables used in the expression are in scope.
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