using System.Runtime.CompilerServices; namespace System { internal static class LocalAppContextSwitches { public static bool DefaultActivityIdFormatIsHierarchial { get; } = InitializeDefaultActivityIdFormat(); private static bool InitializeDefaultActivityIdFormat() { bool switchValue = false; if (!GetSwitchValue("System.Diagnostics.DefaultActivityIdFormatIsHierarchial", ref switchValue)) { string environmentVariable = Environment.GetEnvironmentVariable("DOTNET_SYSTEM_DIAGNOSTICS_DEFAULTACTIVITYIDFORMATISHIERARCHIAL"); if (environmentVariable != null) switchValue = (environmentVariable.Equals("true", StringComparison.OrdinalIgnoreCase) || environmentVariable.Equals("1")); } return switchValue; } [MethodImpl(MethodImplOptions.AggressiveInlining)] internal static bool GetSwitchValue(string switchName, ref bool switchValue) { return AppContext.TryGetSwitch(switchName, out switchValue); } } }