namespace System.ServiceModel.Diagnostics { internal static class TraceUtility { public const string E2EActivityId = "E2EActivityId"; public const string TraceApplicationReference = "TraceApplicationReference"; public static Func<Action<AsyncCallback, IAsyncResult>> asyncCallbackGenerator; public static bool PropagateUserActivity { get; } public static InputQueue<T> CreateInputQueue<T>() where T : class; public static long RetrieveMessageNumber(); } }