设计模式：外观模式

外观模式（Facade）：为子系统中的一组接口提供一个一致的界面，此模板定义了一个高层接口，这个接口使得这一子系统更加容易使用。

namespace Facade
{
    public class SubSystemOne
    {
        public void MethodeOne()
        {
            Console.WriteLine("子系统方法一");
        }
    }
    public class SubSystemTwo
    {
        public void MethodeTwo()
        {
            Console.WriteLine("子系统方法二");
        }
    }
    public class SubSystemThree
    {
        public void MethodeThree()
        {
            Console.WriteLine("子系统方法三");
        }
    }
    public class SubSystemFour
    {
        public void MethodeFour()
        {
            Console.WriteLine("子系统方法四");
        }
    }
    public class Facade
    {
        SubSystemOne one;
        SubSystemTwo two;
        SubSystemThree three;
        SubSystemFour four;
        public Facade()
        {
            one = new SubSystemOne();
            two = new SubSystemTwo();
            three = new SubSystemThree();
            four=new SubSystemFour();
        }
        public void MethodA()
        {
            Console.WriteLine("\n方法组A() ---");
            one.MethodeOne();
            two.MethodeTwo();
            four.MethodeFour();
        }
        public void MethodB()
        {
            Console.WriteLine("\n方法组B() ---");
            two.MethodeTwo();
            three.MethodeThree();
        }
    }
}

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测试代码：

            Facade.Facade facade = new Facade.Facade();
            facade.MethodA();
            facade.MethodB();

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