1. //Abstract factory
    2. abstract class ComputerFactory
    3. {
    4.     public abstract Computer BuildComputer(Computer.ComputerType compType);
    5. }
    7. //Concrete factory
    8. class Dell : ComputerFactory
    9. {
    10.     public override Computer BuildComputer(Computer.ComputerType compType)
    11.     {
    12.         if (compType == Computer.ComputerType.xps)
    13.             return (new xps());
    14.         else if (compType == Computer.ComputerType.inspiron)
    15.             return new inspiron();
    16.         else
    17.             return null;
    18.     }
    19. }
    21. //Concrete factory
    22. class Hp : ComputerFactory
    23. {
    24.     public override Computer BuildComputer(Computer.ComputerType compType)
    25.     {
    26.         if (compType == Computer.ComputerType.envoy)
    27.             return (new envoy());
    28.         else if (compType == Computer.ComputerType.presario)
    29.             return new presario();
    30.         else
    31.             return null;
    32.     }
    33. }
    35. //Abstract product
    36. public abstract class Computer
    37. {
    38.     public abstract string Mhz { get; set; }
    39.     public enum ComputerType
    40.     {
    41.         xps,inspiron,envoy,presario
    42.     }
    43. }
    45. //Concrete product for DELL
    46. public class xps : Computer
    47. {
    48.     string _mhz = string.Empty;
    50.     public override string Mhz
    51.     {
    52.         get
    53.         {
    54.             return _mhz;
    55.         }
    56.         set
    57.         {
    58.             _mhz = value;
    59.         }
    60.     }
    61. }
    63. //Concrete product for DELL
    64. public class inspiron : Computer
    65. {
    66.     string _mhz = string.Empty;
    68.     public override string Mhz
    69.     {
    70.         get
    71.         {
    72.             return _mhz;
    73.         }
    74.         set
    75.         {
    76.             _mhz = value;
    77.         }
    78.     }
    79. }
    81. //Concrete product for HP
    82. public class envoy : Computer
    83. {
    84.     string _mhz = string.Empty;
    86.     public override string Mhz
    87.     {
    88.         get
    89.         {
    90.             return _mhz;
    91.         }
    92.         set
    93.         {
    94.             _mhz = value;
    95.         }
    96.     }
    97. }
    99. //Concrete product for HP
    100. public class presario : Computer
    101. {
    102.     string _mhz = string.Empty;
    104.     public override string Mhz
    105.     {
    106.         get
    107.         {
    108.             return _mhz;
    109.         }
    110.         set
    111.         {
    112.             _mhz = value;
    113.         }
    114.     }
    115. }
    117. public class BestBuy
    118. {
    119.     ComputerFactory compFactory;
    120.     Computer comp;
    121.     public BestBuy(Computer.ComputerType compType)
    122.     {
    123.         if (compType == Computer.ComputerType.xps || compType == Computer.ComputerType.inspiron)
    124.             compFactory = new Dell();
    125.         else
    126.             compFactory = new Hp();
    128.         comp = compFactory.BuildComputer(compType);
    129.     }
    131.     public Computer Sell()
    132.     {
    133.         return comp;
    134.     }
    135. }