一個簡潔的迴圈隊列實現

public interface ICycle<T>:IEnumerable<T>
{
     T Get();
}

public class Cycle<T>:ICycle<T>
{
     private class Node<F>
     {
          public Node(F f)
          {
              Data=f;
          }

          public F Data {get;set;}

          public Node<F> Next {get;set;}
     }

     private Node<T> Head=null;

     private Node<T> Last=null;

     public Cycle(IEnumerable<T> list)
     {
          if(list==null||!list.Any()){throw new ArgumentException("argument is null or empty.");}

          foreach(var item in list)
          {
             if(Head==null){Last=new Node<T>(item);Head=Last;}
             else{Last.Next=new Node<T>(item);Last=Last.Next;}
             Last.Next=Head;
          }
          Last=Head;
     }
     public T Get(){var d=Last.Data;Last=Last.Next;return d;}
     public IEnumerator<T> GetEnumerator()
     {
           var temp=Head;
           while(temp!=null){var d=temp.Data;temp=temp.Next;yield return d;}
     }
     public IEnumerator IEnumerable.GetEnumerator()
     {
           var temp=Head;
           while(temp!=null){var d=temp.Data;temp=temp.Next;yield return d;}
     }
}