[Supported in the .NET Framework 4.5.1 and later versions]
Gets the activity ID on the thread that the event was written to.
Assembly: mscorlib (in mscorlib.dll)
Retrieving the value of the property accesses thread local storage. This has the following implications:
The field is valid only for the duration of the EventListener.OnEventWritten callback.
If the activity ID is changed during the callback, the activity ID returned by the property is invalid.
Windows Phone 8.1
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.