C#面向对象设计模式纵横谈——22 State状态模式

主讲：李建忠

来源：http://www.microsoft.com/china/msdn/events/webcasts/shared/webcast/consyscourse/CsharpOOD.aspx

 

 

   1:  abstract class StatedDocument    //抽象类——表达状态及依赖状态的行为

   2:  {

   3:      public abstract void Handle1();

   4:      public abstract void Handle2();

   5:      public abstract void Handle3();

   6:   

   7:      public abstract StatedDocument Next

   8:      {

   9:          get;

  10:          set;

  11:      }

  12:  }

  13:   

  14:  class Document   //主逻辑

  15:  {

  16:      StatedDocument statedDocument;

  17:   

  18:      public void SetStatedDocument(StatedDocument statedDocument)

  19:      {

  20:          this.statedDocument=statedDocument;

  21:      }

  22:   

  23:      public void Handle1()

  24:      {

  25:          statedDocument.Handle1();

  26:          statedDocument=statedDocument.Next;

  27:      }

  28:   

  29:      public void Handle2()

  30:      {

  31:          statedDocument.Handle2();

  32:      }

  33:   

  34:      public void Handle3()

  35:      {

  36:          statedDocument.Handle3();

  37:      }

  38:  }