System.Reflection.AssemblyBuilder: adding referenced assemblys

[Michael Sander]

Hello ng,
anyone knowns how to add a reference to an assembly to
System.Reflecti on.AssemblyBuil der?

In System.Web.Comp ilation.Assembl yBuilder is a function like
AddAssemblyRefe rence, but not in System.Reflecti on.

Regards,
Michael

[Marc Gravell]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

Didn't you ask this a few hours ago?

[Michael Sander]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

yeah, but it was deleted somehow
"Marc Gravell" <marc.gravell@g mail.comschrieb im Newsbeitrag
news:OQ8LKS%23E JHA.4712@TK2MSF TNGP02.phx.gbl. ..

Didn't you ask this a few hours ago?

[Marc Gravell]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

Nope - still there... I get it both from news.microsoft. com and from
google groups (watch for wrap...)

http://groups.google.com/group/microsoft.public.dotnet.languages.csharp/browse_thread/thread/1a591da28ec3f02e/23817db409dfbc84

Marc

[Michael Sander]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

oh, just found your answer. funny, my orginal entry has been deleted, but
your answer ist there.

yes, i need to i guess. the problem is, that i create an interface there,
that inherits from some other interface.

if both interfaces a created in the dynamic assembly all works fine.
if the base interface is created in some other assembly it wont show up in
the class viewer as base type of my dynamic interface.
even more weird: i can create an object of the type of the dynamic
interface, query the implemented interfaces an it shows the dynamic
interface. but the cast fails.


"Marc Gravell" <marc.gravell@g mail.comschrieb im Newsbeitrag
news:OQ8LKS%23E JHA.4712@TK2MSF TNGP02.phx.gbl. ..

Didn't you ask this a few hours ago?

[Marc Gravell]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

OK, here's a complete example that declares an interface in one
dynamic assembly, implements it in another, and then tests the
interface via reflection. It also saves both assemblies to disk so you
can load them in reflector/ildasm and verify that the references have
been set correctly (which they have, for me at least...):

using System;
using System.Reflecti on;
using System.Reflecti on.Emit;

namespace ConsoleApplicat ion3
{
class Program
{
static void Main()
{
AssemblyBuilder assembly =
AppDomain.Curre ntDomain.Define DynamicAssembly (
new AssemblyName("F oo"),
AssemblyBuilder Access.RunAndSa ve);
ModuleBuilder module =
assembly.Define DynamicModule(" Foo.dll");
TypeBuilder tb = module.DefineTy pe("IFoo",
TypeAttributes. Interface | TypeAttributes. Abstract |
TypeAttributes. Public);
PropertyBuilder prop = tb.DefineProper ty("Message",
PropertyAttribu tes.None, typeof(string), Type.EmptyTypes );
MethodBuilder method = tb.DefineMethod ("get_Messag e",
MethodAttribute s.Public | MethodAttribute s.HideBySig
| MethodAttribute s.NewSlot | MethodAttribute s.Abstract
| MethodAttribute s.Virtual, CallingConventi ons.HasThis,
typeof(string), Type.EmptyTypes );
prop.SetGetMeth od(method);
Type ifoo = tb.CreateType() ;
assembly.Save(" Foo.dll");


assembly = AppDomain.Curre ntDomain.Define DynamicAssembly (
new AssemblyName("B ar"),
AssemblyBuilder Access.RunAndSa ve);
module = assembly.Define DynamicModule(" Bar.dll");
tb = module.DefineTy pe("Bar", TypeAttributes. Class |
TypeAttributes. Sealed | TypeAttributes. Public);
tb.DefineDefaul tConstructor(Me thodAttributes. Public);
tb.AddInterface Implementation( ifoo);
MethodInfo interfaceMethod =
ifoo.GetMethod( "get_Messag e");
method = tb.DefineMethod ("MyMethodImpl" ,
MethodAttribute s.Private | MethodAttribute s.HideBySig
| MethodAttribute s.NewSlot | MethodAttribute s.Final |
MethodAttribute s.Virtual | MethodAttribute s.SpecialName
, CallingConventi ons.HasThis, typeof(string),
Type.EmptyTypes );
ILGenerator il = method.GetILGen erator();
il.Emit(OpCodes .Ldstr, "hello world");
il.Emit(OpCodes .Ret);
tb.DefineMethod Override(method , interfaceMethod );
Type bar = tb.CreateType() ;
assembly.Save(" Bar.dll");

typeof(Program) .GetMethod("Tes t").MakeGeneric Method(ifoo,
bar).Invoke(nul l, null);
}

public static void Test<TInterface , TClass>()
where TInterface : class
where TClass : class, TInterface, new()
{
// create an instance
TClass obj = new TClass();

// check the cast (already validated by generic
constraint)
TInterface i = obj;

// try to read the property
PropertyInfo prop =
typeof(TInterfa ce).GetProperty ("Message");
object val = prop.GetValue(o bj, null);
Console.WriteLi ne(val);
}
}
}

[Marc Gravell]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

My main thoughts: are you calling AddInterfaceImp lementation /
DefineMethodOve rride? These are the important bits for applying the
interface implementation.

Also - sorry if the code (previous post) is ugly; it largely goes with
the turf for Reflection.Emit , I'm afraid...

Marc

[Michael Sander]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

hi marc,
i adjusted your example to meet my case. the cast works fine, there might be
some other issue in my code, but still i cant see IFoo/Foo as BaseType in
the ClassViewer.

using System;

using System.Reflecti on;

using System.Reflecti on.Emit;

namespace ConsoleApplicat ion3

{

public interface IFoo

{

}

public class Foo : IFoo

{

}

class Program

{

static void Main()

{

AssemblyBuilder assembly = AppDomain.Curre ntDomain.Define DynamicAssembly (new
AssemblyName("B ar"), AssemblyBuilder Access.RunAndSa ve);

ModuleBuilder module = assembly.Define DynamicModule(" Bar.dll");

TypeBuilder tb = module.DefineTy pe("IBar", TypeAttributes. Interface |
TypeAttributes. Abstract | TypeAttributes. Public);

tb.AddInterface Implementation( typeof(IFoo));

Type iBar = tb.CreateType() ;

tb = module.DefineTy pe("Bar", TypeAttributes. Public | TypeAttributes. Class,
typeof(Foo));

tb.AddInterface Implementation( iBar);

Type bar = tb.CreateType() ;

assembly.Save(" Bar.dll");

typeof(Program) .GetMethod("Tes t").MakeGeneric Method(iBar, bar).Invoke(nul l,
null);

}

public static void Test<TInterface , TClass>() where TInterface : class where
TClass : class, TInterface, new()

{

TClass obj = new TClass();

TInterface i = obj;

}

}

}

[Marc Gravell]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

I tried your code; it looks fine in reflector, so I imagine that VS is
just having a hard time resolving the interface back to the current
project assembly (or something).

As long as it works, I'd stop digging
[else it might stop working again!]

Marc

[Michael Sander]

Re: System.Reflecti on.AssemblyBuil der: adding referenced assemblys

well, its only working in this tiny example. not in my app wich is far mor
complicated. i guess i will have to narrow this down.
thanks for your time and help!


"Marc Gravell" <marc.gravell@g mail.comschrieb im Newsbeitrag
news:uK6Dui$EJH A.3488@TK2MSFTN GP02.phx.gbl...

>I tried your code; it looks fine in reflector, so I imagine that VS is just
>having a hard time resolving the interface back to the current project
>assembly (or something).
>
As long as it works, I'd stop digging
[else it might stop working again!]
>
Marc