程序码本身就会产生写入到预设追踪接听项中的追踪讯息。

The code alone results in the trace messages being written to the default trace listener.

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当工作流程执行阶段引擎为追踪服务没有关联追踪设定档的工作流程类型要求设定档时，将传回这个新的预设设定档。

SqlTrackingService will return the default tracking profile to the workflow runtime engine for any workflow type for which it doesn't have a tracking profile associated in its database.

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