Question

I have created a type like this:

TypeBuilder tb = moduleBuilder.DefineType(myname, TypeAttributes.Class |
      TypeAttributes.Public, typeof(BaseClass), new Type[] { typeof(ImyInterface) });

Then lots of ilgenerating code follows for constructors, methods etc.
When I start using the class I noticed something strange. I want to check whether the type ‘myname’ that i created really implements the ImyInterface. I would expect that both of the following statements return true:

// t is Type 'myName'
Type baseInterface = t.GetInterface(typeof(ImyInterface).name);   
if (baseType != null)
{
  // this is actually true, as I expected
}

if (typeof(ImyInterface).isAssignableFrom(t))
{
  // the if clause is false, but I don't have a clue why??
}

So I have created a class that implements ImyInterface but which is not assignable to an object of type ImyInterface, what am I missing?

By the way, there are no generics involved and the Interface is just a basic one to test the concept:

public interface ITestInterface
{
    int CalcSquaredInteger(int number);
}

Answer 1

I finally found out what I was missing: Whenever you are checking for type compatibility and assignability between types and interfaces that you have defined in different projects/ assemblies, then make sure that all your projects are signed and strongly named!! Otherwise the GetInterface method will work, because that just compares a name. But .net will not assign between types.