avoiding-exceptions-on-clr-shutdown-when-consuming-com-objects-built-with-clr.md

description	Learn more about: Avoiding Exceptions on CLR Shutdown When Consuming COM Objects Built with /clr
title	Avoiding Exceptions thrown by COM Objects Built with -clr
ms.date	11/04/2016
helpviewer_keywords	interop [C++], CLR shutdown exceptions /clr compiler option [C++], CLR shutdown exceptions mixed assemblies [C++], CLR shutdown exceptions /clr compiler option [C++], COM objects interoperability [C++], CLR shutdown exceptions CLR shutdown exceptions [C++]
ms.assetid	41249d83-4b51-4e46-866f-27f475f2498c
ms.topic	concept-article

Avoiding Exceptions on CLR Shutdown When Consuming COM Objects Built with /clr

Once the common language runtime (CLR) enters shutdown mode, native functions have limited access to CLR services. When attempting to call Release on a COM object compiled with /clr, the CLR transitions to native code and then transitions back into managed code to service the IUnknown::Release call (which is defined in managed code). The CLR prevents the call back into managed code since it is in shutdown mode.

To resolve this, ensure that destructors called from Release methods only contain native code.

See also

Mixed (Native and Managed) Assemblies