Colin JN Breame wrote:
I've come across this problem before but never solved it (even after searching
the internet for several hours!). So I thought I'd ask here....
I have two dlls:
a.dll - contains interface a.a
b.dll - contains class b.b that implements a.a
A main program loads b.dll and tests each type in the assembly to find out if
it implements a.a. This all works except the class b.b (that I know
implements a.a) says that it doesn't! e.g. IsSubclassOf returns false.
I think that this might have something to do with AppDomains or some other
restriction of loading and using types from a dynamically loaded assembly.
I'm really stuck with this (got that banging my head against a brick wall
feeling...) so any help would be greatly appreciated.
Below is a test setup if you're wondering what I mean...
This is by design. Have a look at the section "Return value"
of http://tinyurl.com/bpnjl
You have to use typeof(a.a).IsAssignableFrom () instead:
namespace test {
public class test {
public static void Main() {
Assembly a = Assembly.LoadFrom("b.dll");
Type[] types = a.GetTypes();
foreach (Type t in types) {
if (typeof(a.a).IsAssignableFrom(t))
Console.WriteLine("{0} is a subclass of {1}", t,
typeof(a.a));
else
Console.WriteLine("{0} is not a subclass of {1}", t,
typeof(a.a));
}
}
}
}
Robert
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