Chain Of Responsibility 避免把一个请求的发送者和请求者的接收者进行耦合，这个模式要求多个对象都有机会处理这个请求

客户代码
1            Console.WriteLine( root.Responsible.Name );
2            Console.WriteLine( leafoneleft.Responsible.Name );
3            Console.WriteLine( leafoneright.Responsible.Name );
4            Console.WriteLine( leaftwoleft.Responsible.Name );
5            Console.WriteLine( leaftworight.Responsible.Name );
6            Console.ReadLine();

MachineComponent
 1using System;
 2
 3namespace Gof.Test.ChaninOfResponsibility
 4{
 5    public abstract class MachineComponent
 6    {
 7        public MachineComponent(MachineComponent parent)
 8        {
 9            _parent = parent;            
10        }
11        public MachineComponent(MachineComponent parent,Engineer responsible):this(parent)
12        {
13            _responsible = responsible;
14        }
15        public virtual MachineComponent Parent
16        {
17            get
18            {
19                return _parent;
20            }
21        }private MachineComponent _parent;
22        public virtual Engineer Responsible
23        {
24            get
25            {
26                if( _responsible != null)
27                {
28                    return _responsible;
29                }
30                return Parent.Responsible;
31            } 
32        }private Engineer _responsible;
33    }
34}

MachineComposite
 1using System;
 2
 3namespace Gof.Test.ChaninOfResponsibility
 4{
 5    public class MachineComposite:MachineComponent
 6    {
 7        public MachineComposite(MachineComponent parent):base(parent)
 8        {}
 9        public MachineComposite(MachineComponent parent,Engineer responsible):base(parent,responsible)
10        {}
11    }
12}

Machine
 1using System;
 2
 3namespace Gof.Test.ChaninOfResponsibility
 4{
 5    public class Machine:MachineComponent
 6    {
 7        public Machine(MachineComponent parent):base(parent)
 8        { }
 9        public Machine(MachineComponent parent,Engineer responsible):base(parent,responsible)
10        { }
11    }
12}

MachineRoot
 1using System;
 2
 3namespace Gof.Test.ChaninOfResponsibility
 4{
 5    public class MachineRoot:MachineComposite
 6    {
 7        public MachineRoot(Engineer responsible):base(null,responsible)
 8        {
 9        }
10        public override MachineComponent Parent
11        {
12            get
13            {
14                throw new Exception("根节点没有上一级");
15            }
16        }
17
18    }
19}

Engineer
 1using System;
 2
 3namespace Gof.Test.ChaninOfResponsibility
 4{
 5    public class Engineer
 6    {
 7        public Engineer(string name)
 8        {
 9            _name = name;
10        }
11        public string Name
12        {
13            get
14            {
15                return _name;
16            }
17            set
18            {
19                _name = value;
20            }
21        }private string _name = string.Empty; 
22    }
23}