Exception on EnableReferences extension only when debugging

I don’t know how to exactly reproduce it as it happens in specific circumstances. But when those are met, the exception always happens, eg. some of our tests always fail when debugging.

XmlSerializer is defined as follows:

private static readonly IExtendedXmlSerializer _Serializer = new ConfigurationContainer()
	.EnableReferences()
	.Create();

Full stacktrace:

DefaultActivators.Reference() in ExtendedXmlSerializer.ReflectionModel, ExtendedXmlSerializer.dll
DefaultActivators.Create() in ExtendedXmlSerializer.ReflectionModel, ExtendedXmlSerializer.dll
ConditionalWeakTable<Type, IActivator>.GetValue() in System.Runtime.CompilerServices, mscorlib.dll
ReferenceCacheBase<Type, IActivator>.Get() in ExtendedXmlSerializer.Core.Sources, ExtendedXmlSerializer.dll
FixedSource<Type, IActivator>.Get() in ExtendedXmlSerializer.Core.Sources, ExtendedXmlSerializer.dll
Lazy<IActivator>.CreateValue() in System, mscorlib.dll
Lazy<IActivator>.LazyInitValue() in System, mscorlib.dll
Lazy<IActivator>.get_Value() in System, mscorlib.dll
SingletonSource<IActivator>.Get() in ExtendedXmlSerializer.Core.Sources, ExtendedXmlSerializer.dll
Activators.Activator.Get() in ExtendedXmlSerializer.ExtensionModel.Types, ExtendedXmlSerializer.dll
Extensions.New<ExtendedXmlSerializer.ExtensionModel.RootInstanceExtension>() in ExtendedXmlSerializer.ReflectionModel, ExtendedXmlSerializer.dll
Extensions.New<ExtendedXmlSerializer.ExtensionModel.RootInstanceExtension>() in ExtendedXmlSerializer.ReflectionModel, ExtendedXmlSerializer.dll
Extensions.Add<ExtendedXmlSerializer.ExtensionModel.RootInstanceExtension>() in ExtendedXmlSerializer.Configuration, ExtendedXmlSerializer.dll
Extensions.Add<ExtendedXmlSerializer.ExtensionModel.RootInstanceExtension>() in ExtendedXmlSerializer.Configuration, ExtendedXmlSerializer.dll
Extensions.With<ExtendedXmlSerializer.ExtensionModel.RootInstanceExtension>() in ExtendedXmlSerializer.Configuration, ExtendedXmlSerializer.dll
Extensions.EnableRootInstances<ExtendedXmlSerializer.Configuration.IRootContext>() in ExtendedXmlSerializer.ExtensionModel, ExtendedXmlSerializer.dll
Extensions.EnableReferences() in ExtendedXmlSerializer.Configuration, ExtendedXmlSerializer.dll
Extensions.EnableReferences() in ExtendedXmlSerializer.Configuration, ExtendedXmlSerializer.dll
--- static xml serializer initialization is here
--- our test is here
[Native to Managed Transition]
RuntimeMethodInfo.UnsafeInvokeInternal() in System.Reflection, mscorlib.dll
RuntimeMethodInfo.Invoke() in System.Reflection, mscorlib.dll
MethodBase.Invoke() in System.Reflection, mscorlib.dll
TestMethodRunner.DefaultTestMethodInvoke() in Microsoft.VisualStudio.TestPlatform.MSTestFramework, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
TestMethodRunner.RunTestMethod() in Microsoft.VisualStudio.TestPlatform.MSTestFramework, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
TestMethodRunner.ExecuteTest() in Microsoft.VisualStudio.TestPlatform.MSTestFramework, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
TestMethodRunner.ExecuteInternal() in Microsoft.VisualStudio.TestPlatform.MSTestFramework, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
TestMethodRunner.Execute() in Microsoft.VisualStudio.TestPlatform.MSTestFramework, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
UnitTestRunner.RunInternal() in Microsoft.VisualStudio.TestPlatform.MSTestFramework, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
UnitTestRunner.RunSingleTest() in Microsoft.VisualStudio.TestPlatform.MSTestFramework, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
[Application Domain Transition]
MixedModeExecutor.ExecuteTestViaMsTestV1Runner() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
MixedModeExecutor.ExecuteTests() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
MixedModeExecutor.ExecuteDurontoTestsInternal() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
MixedModeExecutor.ExecuteDurontoTests() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
MixedModeExecutor.ExecuteTests() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
MixedModeExecutor.ExecuteTests() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
MixedModeExecutor.RunTests() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
MSTestExecutor.RunTests() in Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration, Microsoft.VisualStudio.TestPlatform.Extensions.VSTestIntegration.dll
TestExecutionManager.RunTestInternalWithExecutors() in Microsoft.VisualStudio.TestPlatform.Core, Microsoft.VisualStudio.TestPlatform.Core.dll
TestExecutionManager.RunTestsInternal() in Microsoft.VisualStudio.TestPlatform.Core, Microsoft.VisualStudio.TestPlatform.Core.dll
TestExecutionManager.RunTests() in Microsoft.VisualStudio.TestPlatform.Core, Microsoft.VisualStudio.TestPlatform.Core.dll
TestExecutionManager.RunTests() in Microsoft.VisualStudio.TestPlatform.Core, Microsoft.VisualStudio.TestPlatform.Core.dll
ThreadHelper.ThreadStart_Context() in System.Threading, mscorlib.dll
ExecutionContext.RunInternal() in System.Threading, mscorlib.dll
ExecutionContext.Run() in System.Threading, mscorlib.dll
ExecutionContext.Run() in System.Threading, mscorlib.dll
ThreadHelper.ThreadStart() in System.Threading, mscorlib.dll
[Native to Managed Transition]

Where the exception happens exactly:

[bpaczkowski]

Seems ok, the exception is not thrown anymore for me.

[Mike-E-angelo]

Ok cool. I have deployed this to nuget and it should be available soon. Please let us know if you encounter any additional issues and/or feel free to open a new issue as well. Closing for now.