I'm not entirely sure IsSubclassOf is meant to return true for classes
implementing an interface? Certainly I've found that it hasn't in the
past, and instead I use GetInterface() I think it is, passing in the
name of the interface I'm looking for, and checking to see if that
returns the interface type, or a null. This would change the code below
from:
if (t.IsSubclassOf(typeof(a.a))) {
to:
if (t.GetInterface(typeof(a.a).FullName)!=null) {
Maybe someone else can comment on whether or not IsSubclassOf *should*
be returning true for interfaces, but in the meantime I hope the above
information should help you out.
Let me know how you get on,
-= El =-
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...
Thanks,
-- Colin
a.cs:
namespace a {
public interface a {
string hello();
}
}
b.cs:
namespace b {
public class b : a.a {
public string hello() {
return "hello world";
}
}
}
main.cs:
using System;
using System.Reflection;
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 (t.IsSubclassOf(typeof(a.a))) {
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));
}
}
}
}
}
build.sh:
mcs -target:library -out:a.dll a.cs &&
mcs -target:library -out:b.dll -r:a.dll b.cs &&
mcs -out:test.exe -r:a.dll test.cs
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