C# types quality in 2 assemblies

Question

I have project A with reference to project COMMON. In project COMMON i have interface T. I have another DLL B. The B project has reference to project COMMON. COMMON dll is located in both folders.

In project A i load assembly B using Assembly.LoadFromFile. I need to find all types implemented interface T.

var types = (from type in assembly.GetExportedTypes() 
where typeof(T).IsAssignableFrom(type) select type).ToList();

I getting 0-size collection. Also i was check types manually in Quick Watch dialog window like :

typeof(T) == assembly.GetExportedTypes()[0].GetInterfaces()[0] 

and result was FALSE.

Answer 1

This expression:

X.IsAssignableFrom(Y)

basically ask, can you do the equivalent of this:

X x = expressionOfTypeY;

In your case you're asking this:

ClassType x = expressionOfInterfaceType;

Which is the wrong way around.

Try this LINQ query instead:

where typeof(T).IsAssignableFrom(type)

Answer 2

Shouldn´t that be

var types = (from type in assembly.GetExportedTypes() 
where typeof(T).IsAssignableFrom(type) select type).ToList();

Answer 3

OK i solved my problem.

I removed common.dll from plugin folder and i checked "Copy Local" to false. I also using autofac in both projects so for this DLL i was made same steps.

Thanks for Your answers.