LocalAppContextSwitches.cs

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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 = IsTrueStringIgnoreCase(environmentVariable) || environmentVariable.Equals("1");
            }
        }
        return switchValue;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    private static bool IsTrueStringIgnoreCase(string value)
    {
        if (value.Length == 4 && (value[0] == 't' || value[0] == 'T') && (value[1] == 'r' || value[1] == 'R') && (value[2] == 'u' || value[2] == 'U'))
        {
            if (value[3] != 'e')
            {
                return value[3] == 'E';
            }
            return true;
        }
        return false;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static bool GetSwitchValue(string switchName, ref bool switchValue)
    {
        return AppContext.TryGetSwitch(switchName, out switchValue);
    }
}