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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Runtime.Serialization.Formatters.Binary;
namespace System;
/// <summary>
/// Scope for enabling / disabling the <see cref="BinaryFormatter"/>. Use in a <see langword="using"/> statement.
/// </summary>
public readonly ref struct BinaryFormatterScope
{
private readonly AppContextSwitchScope _switchScope;
public BinaryFormatterScope(bool enable)
{
// Prevent multiple BinaryFormatterScopes from running simultaneously. Using Monitor to allow recursion on
// the same thread.
Monitor.Enter(typeof(BinaryFormatterScope));
_switchScope = new AppContextSwitchScope(AppContextSwitchNames.EnableUnsafeBinaryFormatterSerialization, enable);
}
public void Dispose()
{
try
{
_switchScope.Dispose();
}
finally
{
Monitor.Exit(typeof(BinaryFormatterScope));
}
}
static BinaryFormatterScope()
{
// Need to explicitly set the switch to whatever the default is as its default value is in transition.
#pragma warning disable SYSLIB0011 // Type or member is obsolete
BinaryFormatter formatter = new();
#pragma warning restore SYSLIB0011 // Type or member is obsolete
try
{
#pragma warning disable SYSLIB0011 // Type or member is obsolete
formatter.Serialize(null!, null!);
#pragma warning restore SYSLIB0011
}
catch (NotSupportedException)
{
AppContext.SetSwitch(AppContextSwitchNames.EnableUnsafeBinaryFormatterSerialization, false);
return;
}
catch (ArgumentNullException)
{
AppContext.SetSwitch(AppContextSwitchNames.EnableUnsafeBinaryFormatterSerialization, true);
return;
}
throw new InvalidOperationException();
}
} |