LocalAppContextSwitches.cs

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using System.Runtime.CompilerServices;
 
namespace System;
 
internal static class LocalAppContextSwitches
{
    private static int s_binaryFormatterEnabled;
 
    public static bool BinaryFormatterEnabled
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get
        {
            return GetCachedSwitchValue("System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization", ref s_binaryFormatterEnabled);
        }
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static bool GetCachedSwitchValue(string switchName, ref int cachedSwitchValue)
    {
        if (cachedSwitchValue < 0)
        {
            return false;
        }
        if (cachedSwitchValue > 0)
        {
            return true;
        }
        return GetCachedSwitchValueInternal(switchName, ref cachedSwitchValue);
    }
 
    private static bool GetCachedSwitchValueInternal(string switchName, ref int cachedSwitchValue)
    {
        if (!AppContext.TryGetSwitch(switchName, out var isEnabled))
        {
            isEnabled = GetSwitchDefaultValue(switchName);
        }
        AppContext.TryGetSwitch("TestSwitch.LocalAppContext.DisableCaching", out var isEnabled2);
        if (!isEnabled2)
        {
            cachedSwitchValue = (isEnabled ? 1 : (-1));
        }
        return isEnabled;
    }
 
    private static bool GetSwitchDefaultValue(string switchName)
    {
        if (switchName == "Switch.System.Runtime.Serialization.SerializationGuard")
        {
            return true;
        }
        if (switchName == "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization")
        {
            return true;
        }
        return false;
    }
}