最简单的外观模式

using System;
using System.Collections.Generic;
using System.Text;

namespace Facade
{
    class Program
    {
        static void Main(string[] args)
        {
            CFacade facade = new CFacade();
            facade.fun();
            System.Console.Read();
        }
    }
}
public class C1
{
    public void fun()
    {
        System.Console.WriteLine("c1_fun");
    }
}
public class C2
{
    public void fun()
    {
        System.Console.WriteLine("c2_fun");
    }
}
public class CFacade
{
    public C1 c1;
    public C2 c2;
    public CFacade()
    {
        c1 = new C1();
        c2 = new C2();
    }
    public void fun()
    {
        c1.fun();
        c2.fun();
    }
}