Hello,

I need to extend a type at runtime in order to add some properties/fields to
it. I've managed to create the derived type with help from the
System.Reflection.Emit namespace and the code runs fine. Sample code:

namespace RefTest
{
  public class Base
  {
     private string name = "name";

     public string Name
     {
        get { return this.name; }
     }
  }

  class Class1
  {
     [STAThread]
     static void Main(string[] args)
     {
        Base o = (Base)CreateDerivedInstance();

        Console.WriteLine("Name = " + o.Name);
     }

     public static object CreateDerivedInstance()
     {
        AssemblyName assemblyName = new AssemblyName();
        assemblyName.Name = "MyDummyAssembly";
        AppDomain domain = Thread.GetDomain();
        AssemblyBuilder assemblyBuilder =
domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave);
        ModuleBuilder module =
assemblyBuilder.DefineDynamicModule("MyDummyModule", "MyModule.dll", true);
        TypeBuilder typeBuilder = module.DefineType("Derived",
TypeAttributes.Public, typeof(Base));
        ConstructorBuilder cb =
typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);

        // This type extends type Base
        Type derived = typeBuilder.CreateType();

        return Activator.CreateInstance(derived);
     }
  }
}

As you can see, in Main() I declare local variable 'o' of type Base but at
runtime it is actually an instance of type 'Derived'. The code runs fine. The
problem is that when I set a breakpoint and add 'o.Name' to the Watch window
I get "error: 'o.Name' does not exist" in the Value column. That is, I lose
debugging information about the variable even for members of the base class
(the 'Name' property).

Could anyone shed some light on this? Is there a workaround?

I'm using VS 2003.

Thanks in advance,
mayerber.