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Cannot pass a GCHandle across AppDomains RRS feed

  • Question

  • I have base library in c++ and client application is in C#. There is c++/cli interface to access c++ api's from C#. Every thing works fine until more than one app domain not come into play like NUnit or WCF hosting i.e. with one app domain.

    I have stored managed object in gcroot in cli for callback. I have read that this is the root cause of app domain issue ("Cannot pass a GCHandle across AppDomains") because they don't have app domain info (http://lambert.geek.nz/2007/05/29/unmanaged-appdomain-callback/). someone suggested to use delegates but my underlying c++ layer is expecting object not function pointer(http://www.lenholgate.com/blog/2009/07/error-cannot-pass-a-gchandle-across-appdomains.html). I have also tried IntPtr but in this case i am not able to cast it to my managed object during callbacks("Unable to cast COM object of type 'System.__ComObject' to interface type").

    Is it a bug or any other way to solve this issue ?
    Monday, June 9, 2014 12:57 PM

Answers