I am trying to use the Reflection Emit capability of the framework to
dynamically inherit a base class. I want to call the base classes constructor
with arguments passed into the new classes constructor. I think I am close,
but get the following error trying to activate the new class.

System.Reflection.TargetInvocationException was unhandled
 Message="Exception has been thrown by the target of an invocation."
 Source="mscorlib"
 StackTrace:
      at System.RuntimeMethodHandle._InvokeConstructor(Object[] args,
SignatureStruct& signature, IntPtr declaringType)
      at System.RuntimeMethodHandle.InvokeConstructor(Object[] args,
SignatureStruct signature, RuntimeTypeHandle declaringType)
      at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags
invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
      at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
      at System.Activator.CreateInstance(Type type, BindingFlags
bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
      at System.Activator.CreateInstance(Type type, BindingFlags
bindingAttr, Binder binder, Object[] args, CultureInfo culture)
      at ReflectionEmit.Program.Main(String[] args) in C:\Documents and
Settings\jmcmeni\Desktop\ReflectionEmit\ReflectionEmit\Program.cs:line 47
      at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
      at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence
assemblySecurity, String[] args)
      at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
      at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
      at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
      at System.Threading.ThreadHelper.ThreadStart()
 InnerException: System.InvalidProgramException
      Message="Common Language Runtime detected an invalid program."
      Source="Test"
      StackTrace:
           at AmericanCar..ctor(String , String )
      InnerException:

Here is the small sample that I'm trying to get to work.

Any help would be great.

thanks

Joe

Program

using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;

namespace ReflectionEmit
{
   class Program
   {
       static void Main(string[] args)
       {
           AssemblyName assemblyName = new AssemblyName();
           assemblyName.Name = "Test";
           AssemblyBuilder assemblyBuilder =
Thread.GetDomain().DefineDynamicAssembly(assemblyName,
AssemblyBuilderAccess.RunAndSave);
           ModuleBuilder module;
           module = assemblyBuilder.DefineDynamicModule("Test.dll");

           // create a new type to hold our Main method
           TypeBuilder typeBuilder = module.DefineType("AmericanCar",
TypeAttributes.Public | TypeAttributes.Class, typeof(Car));

           typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);
           FieldBuilder fb = typeBuilder.DefineField("brand",
typeof(string), FieldAttributes.Private);

           ConstructorInfo ci = typeof(Car).GetConstructor(new Type[] {
typeof(string) });

           ConstructorBuilder cb = typeBuilder.DefineConstructor(
ci.Attributes,
                        ci.CallingConvention, new Type[] { typeof(string),
typeof(string) });

           ILGenerator il = cb.GetILGenerator();
         
           int paramCount = ci.GetParameters().Length;
           il.Emit(OpCodes.Ldarg_0);
           for (int i = 1; i <= paramCount; i++)
           {
               il.Emit(OpCodes.Ldarg_S, i);
           }
           il.Emit(OpCodes.Call, ci);

           il.Emit(OpCodes.Ldarg_0);
           il.Emit(OpCodes.Ldarg_2);
           il.Emit(OpCodes.Stfld, fb);

           Type type = typeBuilder.CreateType();
           assemblyBuilder.Save("Test.dll");

           object o = Activator.CreateInstance(type,
BindingFlags.CreateInstance, null, new object[]{"Red","Corvette"},
System.Globalization.CultureInfo.CurrentCulture);

       }

   }

   public class Car
   {
       private string color;

       public string Color
       {
           get { return color; }
           set { color = value; }
       }

       public Car() { }

       public Car(string color)
       {
           this.color = color;
       }
   }
}