gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication21
{
    class Program
    {
        static void Main(string[] args)
        {

            var c1 = new AccountsController();
            var d1 = c1.AutoComplete();
            foreach (var item in d1)
            {
                Console.WriteLine(item.Text);
            }

            Console.WriteLine("------------------------------------------");

            var c2 = new CompaniesController();
            var d2 = c2.AutoComplete();
            foreach (var item in d2)
            {
                Console.WriteLine(item.Text);
            }

            Console.WriteLine("Done");
            Console.ReadLine();

        }
    }
    public interface IProjectStrategy<TEntity, TModel>
    {
        IEnumerable<TModel> Project(IEnumerable<TEntity> data);
    }
    public interface IAutoCompleteStrategy<TEntity, TModel> : IProjectStrategy<TEntity, TModel>
    {
        IEnumerable<TEntity> GetData();
    }

    public abstract class BaseController : IProjectStrategy<string, AutoCompleteModel>
    {
        public IEnumerable<TModel> AutoComplete<TEntity, TModel>(IAutoCompleteStrategy<TEntity, TModel> strategy)
        {
            var data = strategy.GetData();
            return strategy.Project(data);
        }

        public IEnumerable<AutoCompleteModel> Project(IEnumerable<string> data)
        {
            return data.Select(s => new AutoCompleteModel { Id = Guid.NewGuid(), Text = s });
        }
    }


    public class DemoController : BaseController, IAutoCompleteStrategy<string, AutoCompleteModel>
    {

        IEnumerable<string> IAutoCompleteStrategy<string, AutoCompleteModel>.GetData()
        {
            throw new NotImplementedException();
        }

    }
    public class CompaniesController : BaseController, IAutoCompleteStrategy<string,AutoCompleteModel>
    {
        public IEnumerable<AutoCompleteModel> AutoComplete() { return base.AutoComplete(this); }
        public IEnumerable<string> GetData()
        {
            return new[] {
                "Chevron",
                "Exxon"
            };
        }
    }

    public class AccountsController : BaseController, IAutoCompleteStrategy<string, AutoCompleteModel>
    {
        public IEnumerable<AutoCompleteModel> AutoComplete() { return base.AutoComplete(this); }

        public IEnumerable<string> GetData()
        {
            return new[] {
                "Hello",
                "World"
            };
        }
    }

    public class AutoCompleteModel
    {
        public Guid Id { get; set; }
        public string Text { get; set; }
    }
}