Dynamically overriding an abstract method in c#
- by ng
I have the following abstract class
public abstract class AbstractThing {
public String GetDescription() {
return "This is " + GetName();
}
public abstract String GetName();
}
Now I would like to implement some new dynamic types from this like so.
AssemblyName assemblyName = new AssemblyName();
assemblyName.Name = "My.TempAssembly";
AssemblyBuilder assemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("DynamicThings");
TypeBuilder typeBuilder = moduleBuilder.DefineType(someName + "_Thing",
TypeAttributes.Public |
TypeAttributes.Class,
typeof(AbstractThing));
MethodBuilder methodBuilder = typeBuilder.DefineMethod("GetName",
MethodAttributes.Public |
MethodAttributes.ReuseSlot |
MethodAttributes.Virtual |
MethodAttributes.HideBySig,
null,
Type.EmptyTypes);
ILGenerator msil = methodBuilder.GetILGenerator();
msil.EmitWriteLine(selectionList);
msil.Emit(OpCodes.Ret);
However when I try to instantiate via
typeBuilder.CreateType();
I get an exception saying that there is no implementation for GetName. Is there something I am doing wrong here. I can not see the problem.
Also, what would be the restrictions on instantiating such a class by name? For instance if I tried to instantiate via "My.TempAssembly.x_Thing" would it be availble for instantiation without the Type generated?
