using System;

using System.Linq;

using System.Collections.Generic;

​

namespace Example

{

    interface ICreate {}

    class a : ICreate {}

    class b : ICreate {}

    class c : ICreate {}

​

    class Factory

    {

        Dictionary<Func<string,bool>,Func<ICreate>> _map = new Dictionary<Func<string,bool>, Func<ICreate>>

        {

            {

                a  => a.Contains("classA"), 

                () => new a()

            },

            {

                a  => a.Contains("classB"), 

                () => new b()

            },

            {

                a  => a.Contains("classC"), 

                () => new c()

            }

        };

​

        public ICreate Create(string toMatch)

        {

            var func = _map.Where( e => e.Key(toMatch) ).First().Value;

            return func(); 

        }

    }

​

​

    public class Program

    {

        static public void Main()

        {

            var f = new Factory();

            var o = f.Create(@"c:\folder\subfolder\classA");

            Console.WriteLine("You just created an instance of '{0}'.", o.GetType().Name);

        }

    }

}