设计模式-9-组合

public abstract class AbsComponent
    {
        public string name { get; set; }
        public AbsComponent(string _name)
        {
            name = _name;
        }
         public abstract void Exc(int depth);
    }
public class ComponentA : AbsComponent
    {
        public ComponentA(string _name) : base(_name)
        {
            lComponent = new List<AbsComponent>();
        }

        public List<AbsComponent> lComponent { get; set; }
        public override void Exc(int depth)
        {
            Console.WriteLine(new String(‘-‘, depth) + name);

            foreach (var component in lComponent)
                component.Exc(depth + 2);
        }
    }
public class ComponentB : AbsComponent
    {
        public ComponentB(string _name) : base(_name)
        {
        }

        public override void Exc(int depth)
        {
            Console.WriteLine(new String(‘-‘, depth) + name);
        }
    }
var root = new ComponentA("root");
            root.lComponent.Add(new ComponentB("Leaf A"));
            root.lComponent.Add(new ComponentB("Leaf B"));
            ComponentA comp = new ComponentA("Composite X");

            comp.lComponent.Add(new ComponentB("Leaf XA"));
            comp.lComponent.Add(new ComponentB("Leaf XB"));
            root.lComponent.Add(comp);

            root.lComponent.Add(new ComponentB("Leaf C"));

            // Add and remove a leaf
            var l = new ComponentB("Leaf D");
            root.lComponent.Add(l);
            root.lComponent.Remove(l);

            // Recursively display nodes
            root.Exc(1);