A debugging aspect that throws an exception is an object is used by several threads simultaneously

gistfile1.cs

using System.Diagnostics;
using System.Threading;
using PostSharp.Aspects;
using PostSharp.Aspects.Advices;
using PostSharp.Aspects.Configuration;
using PostSharp.Aspects.Serialization;
using PostSharp.Extensibility;

namespace Resonance.Messenging.Threading
{
    [Conditional("DEBUG")]
    [MulticastAttributeUsage(MulticastTargets.Class, TargetMemberAttributes = MulticastAttributes.Instance | MulticastAttributes.Public,
        Inheritance = MulticastInheritance.Strict)]
    [AspectConfiguration(SerializerType = typeof(MsilAspectSerializer))]
    internal sealed class SinglethreadedAttribute : InstanceLevelAspect
    {

        [OnMethodEntryAdvice, MulticastPointcut(Attributes = MulticastAttributes.Instance | MulticastAttributes.Public)]
        public void OnEntry(MethodExecutionArgs args)
        {
            if (!Monitor.TryEnter(this)) throw new ThreadAffinityException();

        }

        [OnMethodExitAdvice(Master = "OnEntry")]
        public void OnExit(MethodExecutionArgs args)
        {
            Monitor.Exit(this);
        }
    }
}