Mediator 用一个中介者对象来封装一系列的对象交互。中介者使各个对象不需要显式的相互作用，从而使其耦合松散，而且可以独立地改变它们之间的交互。

Machine类（可以包含容器）
 1using System;
 2
 3namespace Gof.Test.Mediator
 4{
 5    public class Machine
 6    {
 7        public Machine(string id)
 8        {
 9            _id = id;
10        }
11        private TubMediator _mediator = TubMediator.Singleton();
12        private string _id;
13
14        public void AddTub(Tub t)
15        {
16            _mediator.Set(t,this);
17        }
18        public System.Collections.IList GetTubs()
19        {
20            return _mediator.GetTubs(this);
21        }
22        public override string ToString()
23        {
24            return _id;
25        }
26        public override int GetHashCode()
27        {
28            return _id.GetHashCode();
29        }
30        public override bool Equals(object obj)
31        {
32            if(obj == this)
33            {
34                return true;
35            }
36            if(!(obj is Machine))
37            {
38                return false;
39            }
40            Machine m = (Machine)obj;
41            return _id.Equals(m._id);
42        }
43
44    }
45}

Tub容器（可以添加到Machine,一个容器只能添加到一个Machine)
 1using System;
 2
 3namespace Gof.Test.Mediator
 4{
 5    public class Tub
 6    {
 7        public Tub()
 8        {}
 9        private string _id;
10        private TubMediator _mediator = TubMediator.Singleton();
11        public Tub(string id)
12        {
13            _id = id;
14        }
15        public Machine Location
16        {
17            get
18            {
19                return _mediator.GetMachine(this);
20            }
21            set
22            {
23                _mediator.Set(this,value);
24            }
25        }
26        public override string ToString()
27        {
28            return _id;
29        }
30        public override int GetHashCode()
31        {
32            return _id.GetHashCode();
33        }
34        public override bool Equals(object obj)
35        {
36            if(obj== this)
37            {
38                return true;
39            }
40            if(!( obj is Tub))
41            {
42                return false;
43            }
44            Tub t = (Tub)obj;
45            return _id.Equals(t._id);
46        }
47
48    }
49}

中介者
 1using System;
 2
 3namespace Gof.Test.Mediator
 4{
 5    public class TubMediator
 6    {
 7        private System.Collections.Hashtable _tubMachine = new System.Collections.Hashtable();
 8        private static TubMediator _mediator;
 9        private TubMediator()
10        {}
11        public static TubMediator Singleton()
12        {
13            if(_mediator == null)
14            {
15                _mediator = new TubMediator();
16            }
17            return _mediator;
18        }
19        public Machine GetMachine(Tub t)
20        {
21             return (Machine)_tubMachine[t];
22        }
23        public System.Collections.IList GetTubs(Machine m)
24        {
25            System.Collections.ArrayList al = new System.Collections.ArrayList();
26            System.Collections.IDictionaryEnumerator e = _tubMachine.GetEnumerator();
27            while(e.MoveNext())
28            {
29                if(e.Value.Equals(m))
30                {
31                    al.Add(e.Key);
32                }
33            }
34            return al;
35        }
36        public void Set(Tub t,Machine m)
37        {
38            _tubMachine[t] = m;
39        }
40    }
41}

客户代码
 1using System;
 2
 3namespace Gof.Test.Mediator
 4{
 5    public class TubMediator
 6    {
 7        private System.Collections.Hashtable _tubMachine = new System.Collections.Hashtable();
 8        private static TubMediator _mediator;
 9        private TubMediator()
10        {}
11        public static TubMediator Singleton()
12        {
13            if(_mediator == null)
14            {
15                _mediator = new TubMediator();
16            }
17            return _mediator;
18        }
19        public Machine GetMachine(Tub t)
20        {
21             return (Machine)_tubMachine[t];
22        }
23        public System.Collections.IList GetTubs(Machine m)
24        {
25            System.Collections.ArrayList al = new System.Collections.ArrayList();
26            System.Collections.IDictionaryEnumerator e = _tubMachine.GetEnumerator();
27            while(e.MoveNext())
28            {
29                if(e.Value.Equals(m))
30                {
31                    al.Add(e.Key);
32                }
33            }
34            return al;
35        }
36        public void Set(Tub t,Machine m)
37        {
38            _tubMachine[t] = m;
39        }
40    }
41}