1  using System;
 2
 3     // These two classes could be part of a framework,
 4     // which we will call DP
 5     // ===============================================
 6
 7     class Director
 8     {
 9         public void Construct(AbstractBuilder abstractBuilder)
10         {
11             abstractBuilder.BuildPartA();
12             if (1==1 ) //represents some local decision inside director
13             {
14                 abstractBuilder.BuildPartB();
15             }
16             abstractBuilder.BuildPartC();
17         }
18
19     }
20
21     abstract class AbstractBuilder
22     {
23         abstract public void BuildPartA();
24         abstract public void BuildPartB();
25         abstract public void BuildPartC();
26     }
27
28     // These two classes could be part of an application
29     // =================================================
30
31     class ConcreteBuilder : AbstractBuilder
32     {
33         override public void BuildPartA()
34         {
35             // Create some object here known to ConcreteBuilder
36             Console.WriteLine("ConcreteBuilder.BuildPartA called");
37         }
38
39         override public void BuildPartB()
40         {
41             // Create some object here known to ConcreteBuilder
42             Console.WriteLine("ConcreteBuilder.BuildPartB called");
43         }
44
45         override public void BuildPartC()
46         {
47             // Create some object here known to ConcreteBuilder
48             Console.WriteLine("ConcreteBuilder.BuildPartC called");
49         }
50     }
51
52     /// <summary>
53     ///    Summary description for Client.
54     /// </summary>
55     public class Client
56     {
57         public static int Main(string[] args)
58         {
59             ConcreteBuilder concreteBuilder = new ConcreteBuilder();
60             Director director = new Director();
61
62             director.Construct(concreteBuilder);
63
64             return 0;
65         }
66     }