提供用于将事件和异常信息写入应用程序的日志侦听器中的属性和方法。

Provides a property and methods for writing event and exception information to the application's log listeners.

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创建类的过程中，类的所有属性和方法只设置一次。

During class creation, attributes and methods of classes are set once and for all.

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这种方法同样适用于属性值和内容中的字符数据。

This is true for character data in attribute values as well as content.

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