结构图：



抽象对象：


	复制代码 代码如下:

	

	    abstract class Component

	    {

	        protected string name;

	        public Component(string name)

	        {

	            this.name = name;

	        }

	        public abstract void Add(Component c);

	        public abstract void Remove(Component c);

	        public abstract void Display(int depth);

	    }


无子节点的：


	复制代码 代码如下:

	

	    class Leaf : Component

	    {

	        public Leaf(string name)

	            : base(name)

	        { }

	        public override void Add(Component c)

	        {

	            //throw new NotImplementedException();

	            Console.WriteLine("Cannot add to a Leaf");

	        }

	        public override void Remove(Component c)

	        {

	            //throw new NotImplementedException();

	            Console.WriteLine("Cannot remove to a Leaf");

	        }

	        public override void Display(int depth)

	        {

	            //throw new NotImplementedException();

	            Console.WriteLine(new string('-', depth) + name);

	        }

	    }


可以有子结点：


	复制代码 代码如下:

	

	    class Composite : Component

	    {

	        private List<Component> children = new List<Component>();

	        public Composite(string name)

	            : base(name)

	        { }

	        public override void Add(Component c)

	        {

	            //throw new NotImplementedException();

	            children.Add(c);

	        }

	        public override void Remove(Component c)

	        {

	            //throw new NotImplementedException();

	            children.Remove(c);

	        }

	        public override void Display(int depth)

	        {

	            //throw new NotImplementedException();

	            Console.WriteLine(new string('-', depth) + name);

	            foreach (Component component in children)

	            {

	                component.Display(depth + 2);

	            }

	        }

	    }


 主函数调用：


	复制代码 代码如下:

	

	    class Program

	    {

	        static void Main(string[] args)

	        {

	            Composite root = new Composite("root");

	            root.Add(new Leaf("Leaf A"));

	            root.Add(new Leaf("Leaf B"));

	            Composite comp = new Composite("Composite X");

	            comp.Add(new Leaf("Leaf XA"));

	            comp.Add(new Leaf("Leaf XB"));

	            root.Add(comp);

	            Composite comp2 = new Composite("Composite X");

	            comp2.Add(new Leaf("Leaf XYA"));

	            comp2.Add(new Leaf("Leaf XYB"));

	            comp.Add(comp2);

	            root.Display(1);

	            Console.ReadKey();

	        }

	    }