1 using System;
2
3 abstract class Visitor
4 {
5 abstract public void VisitElementA(ConcreteElementA a);
6 abstract public void VisitElementB(ConcreteElementB b);
7 }
8
9 class ConcreteVisitor1 : Visitor
10 {
11 override public void VisitElementA(ConcreteElementA a)
12 {
13
14 }
15
16 override public void VisitElementB(ConcreteElementB b)
17 {
18
19 }
20 }
21
22 abstract class Element
23 {
24 abstract public void Accept(Visitor v);
25 }
26
27 class ConcreteElementA : Element
28 {
29 public Visitor myVisitor;
30 override public void Accept(Visitor v)
31 {
32 myVisitor = v;
33 }
34
35 public void OperationA()
36 {
37
38 }
39
40 public void DoSomeWork()
41 {
42 // do some work here
43 // . . .
44
45 // Get visitor to visit
46 myVisitor.VisitElementA(this);
47
48 // do some more work here
49 // . . .
50 }
51 }
52
53 class ConcreteElementB : Element
54 {
55 override public void Accept(Visitor v)
56 {
57
58 }
59
60 public void OperationB()
61 {
62
63 }
64 }
65
66 /// <summary>
67 /// Summary description for Client.
68 /// </summary>
69 public class Client
70 {
71 public static int Main(string[] args)
72 {
73 ConcreteElementA eA = new ConcreteElementA();
74 ConcreteElementB eB = new ConcreteElementB();
75 ConcreteVisitor1 v1 = new ConcreteVisitor1();
76
77 eA.Accept(v1);
78 eA.DoSomeWork();
79
80 return 0;
81 }
82 }
