Unable to cast COM object of type exception

Question

I have the following code:

public void Test(IMyInterface iInterface)
{
  iInterface.CallMethod ( );
}

Which works fine. However, if I chang

Answer 1

I've been developing a C# application which uses 7-zip through COM interfaces. I ran into this funny thing where I was able to extract archives from a worker thread in one instance, but not another, getting this same exception.

I found that, so long as you initialize the offending COM object in the thread where it is used no exception is thrown. My solution was to dispose the objects which utilized COM interfaces and re-initialize them when passing them between threads.