Question

I have an Interface called IStep that can do some computation (See ‘Execution in the Kingdom of Nouns‘). At runtime, I want to select the appropriate implementation by class name.

 // use like this: IStep step = GetStep(sName); 

Answer 1

Your question is very confusing…

If you want to find types that implement IStep, then do this:

foreach (Type t in Assembly.GetCallingAssembly().GetTypes()) {   if (!typeof(IStep).IsAssignableFrom(t)) continue;   Console.WriteLine(t.FullName + ' implements ' + typeof(IStep).FullName); } 

If you know already the name of the required type, just do this

IStep step = (IStep)Activator.CreateInstance(Type.GetType('MyNamespace.MyType'));