天天向上

   1: interface Iterator

   2: {

   3:   object First();

   4:   object Next();

   5:   bool IsDone();

   6:   object CurrentItem();

   7: }

   1: namespace IteratorPatternConsole

   2: {

   3:     abstract class Iterable

   4:     {

   5:         public abstract Iterator CreateIterator();

   6:     }

   7: }

   1: class ConcreteIterator : Iterator

   2: {

   3:     ConcreteIterable concreteIterable;

   4:     int current = 0;

   5:     public ConcreteIterator(ConcreteIterable concreteIterable)

   6:     {

   7:         this.concreteIterable = concreteIterable;

   8:     }

   9:     public object CurrentItem()

  10:     {

  11:         throw new NotImplementedException();

  12:     }

  13:  

  14:     public void First()

  15:     {

  16:         throw new NotImplementedException();

  17:     }

  18:  

  19:     public bool IsDone()

  20:     {

  21:         throw new NotImplementedException();

  22:     }

  23:  

  24:     public void Next()

  25:     {

  26:         throw new NotImplementedException();

  27:     }

  28: }

   1: class ConcreteIterable : Iterable

   2: {

   3:     public override Iterator CreateIterator()

   4:     {

   5:         return new ConcreteIterator(this);

   6:     }

   7: }

   1: static void Main(string[] args)

   2: {

   3:    ConcreteIterable items = new ConcreteIterable();

   4:    items[0] = "pen";

   5:    items[1] = "erasor";

   6:    items[2] = "ruler";

   7:    items[3] = "pencil";

   8:    items[4] = "marker";

   9:  

  10:    Iterator i = new ConcreteIterator(items);

  11:    object item = i.First();

  12:    Console.WriteLine("Number of items = {0}", items.Count);

  13:    while(!i.IsDone())

  14:    {

  15:        Console.WriteLine("{0}", i.CurrentItem());

  16:        i.Next();

  17:    }

  18:    Console.ReadKey();

  19: }