Get the custom attributes for the trace source switch.

获取在应用程序配置文件中定义的自定义开关特性。

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The first step to instrumenting an application with tracing is to create a trace source.

使用跟踪检测应用程序的第一步是创建跟踪源。

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In addition to configuring the trace listeners, the configuration file creates filters for both of the listeners and creates a source switch for the trace source.

除了配置跟踪侦听器外，配置文件还同时为这两个侦听器创建筛选器，并为跟踪源创建一个源开关。

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Samples of the oil have also been sent for testing to try and trace its source.

BBC: Oil taking toll on sea birds

But despite spills being "comparatively rare", he added that it would be difficult to trace the source.

BBC: Seabird deaths substance 'identified as oil substance'

Where the material originates outside the UK, the Internet Watch Foundation will attempt to trace the source and pass details to the National Criminal Intelligence Service.

BBC: NEWS | UK | Policing the net