using System;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        var myInstance = (MyInterface)System.Reflection.Assembly.GetExecutingAssembly().CreateInstance("Bar");

        Console.WriteLine(myInstance.GetType().ToString());

        var myType = myInstance.GetType();

        FieldInfo[] list = myType.GetFields();

        foreach (FieldInfo f in list)

        {

            Console.WriteLine(f.FieldType.FullName);

            if (f.FieldType.FullName == "System.String")

            {

                f.SetValue(myInstance, "my const string from dict!");

            }

        }

        myInstance.doStuff();

        myInstance = (MyInterface)System.Reflection.Assembly.GetExecutingAssembly().CreateInstance("Foo");

        Console.WriteLine(myInstance.GetType().ToString());

        myInstance.doStuff();

    }

}

​

public interface MyInterface

{

    void doStuff();

}

​

public class Foo : MyInterface

{

    public int a = 3;

    public void doStuff()

    {

        Console.WriteLine("I am Foo: " + a);

    }

}

​

public class Bar : MyInterface

{

    public String b = "adasd";

    public void doStuff()

    {

        Console.WriteLine("I am Bar: " + b);

    }

}

​