C#实现的简单链表类实例

/// <summary>/// 链表结点/// </summary>class Node{  //结点数据，前后结点  public object Data;  public Node PreviousNode;  public Node NextNode;  //构造函数  public Node(object data = null)  {    Data = data;    PreviousNode = null;    NextNode = null;  }  //输出结点信息  public override string ToString()  {    return Data.ToString();  }}/// <summary>/// 链表类/// </summary>class MyLinkedList{  //首结点、尾结点  public Node First;  public Node Last;  //下一个结点、上一个结点  public Node NextNode(Node n) { return n.NextNode; }  public Node PreviousNode(Node n) { return n.PreviousNode; }  //结点总数  public int Count;  //构造函数  public MyLinkedList()  {    this.First = null;    this.Last = null;    Count = 0;  }  /// <summary>  /// 在结点node1之后增加结点node2，如果没有该结点则在最后增加  /// </summary>  /// <param name="node1">结点1</param>  /// <param name="node2">结点2</param>  public void AddAfter(Node node1, Node node2)  {    //链表为空的情况    if (First == null)    {      Console.WriteLine("Linked-list is null! Can not find node1(" + node1 + ")");      return;    }    Node temp = First;    do    {      if (temp.Data.Equals(node1.Data))      {        //如果node1是尾结点        if (node1.NextNode == null)        {          node2.NextNode = null;          node2.PreviousNode = node1;          node1.NextNode = node2;        }        else //如果node1不是尾结点        {          node2.NextNode = node1.NextNode;          node2.PreviousNode = node1;          node2.NextNode.PreviousNode = node2;          node1.NextNode = node2; ;        }        Count++;        Console.WriteLine("Node(" + node2 + "): Add Complete!");        return;      }      temp = temp.NextNode;    }    while (temp != null);    Console.WriteLine("Can not find node(" + node1 + "), Misson defeat");  }  /// <summary>  /// 在链表尾部增加结点  /// </summary>  public void AddLast(Node node)  {    //链表为空的情况    if (this.First == null)     {      node.NextNode = null;      node.PreviousNode = null;      this.First = node;      this.Last = node;    }    else //链表不为空的情况    {      Node temp = First;      while(temp.NextNode != null)      {        temp = temp.NextNode;      }      temp.NextNode = node;      node.PreviousNode = temp;      Last = node;    }    Count++;    Console.WriteLine("Node(" + node + "): Add Complete!");  }  /// <summary>  /// 删除指定结点  /// </summary>  /// <param name="node">被删除结点</param>  public void Delete(Node node)  {    if (Count == 0)    {      Console.WriteLine("Can not find node(" + node + ")");      return;    }    Node temp = First;    do    {      //如果数据部分匹配，则删去该结点      if (temp.Data.Equals(node.Data))      {        //temp是尾结点        if (temp.NextNode == null)        {          temp.PreviousNode.NextNode = null;          temp = null;        }        else //temp不是尾结点         {          temp.PreviousNode.NextNode = temp.NextNode;          temp.NextNode.PreviousNode = temp.PreviousNode;          temp = null;        }        Count--;        Console.WriteLine("Node(" + node + "): Delete Complete!");        return;      }      temp = temp.NextNode;    }    while (temp != null);    Console.WriteLine("Can not find node(" + node + "), Misson defeat");  }  /// <summary>  /// 修改结点值  /// </summary>  /// <param name="node">被修改结点</param>  /// <param name="value">结点值</param>  public void Modify(Node node, object value)  {    if (Count == 0)    {      Console.WriteLine("Can not find node(" + node + ")");      return;    }    Node temp = First;    do    {      if (temp.Data.Equals(node.Data))      {        Console.WriteLine("Node: " + temp.Data + " → " + value.ToString());        temp.Data = value;        return;      }      temp = temp.NextNode;    }    while (temp != null);  }  /// <summary>  /// 打印链表  /// </summary>  public void Print()  {    if (First == null)    {      Console.WriteLine("No nodes in this linked-list.");      return;    }    else    {      Console.WriteLine("Print the linked-list...");      Node temp = First;      do      {        Console.WriteLine(temp.ToString());        temp = temp.NextNode;      }      while (temp != null);      Console.WriteLine("Mission Complete!");    }  }}

static void Main(string[] args){  MyLinkedList ll = new MyLinkedList();  //添加三个结点 1 2（在1后） 3（在2后）  Node n1 = new Node("node1");        Node n2 = new Node("node2");  Node n3 = new Node("node3");  ll.AddLast(n1);  ll.AddLast(n2);  ll.AddLast(n3);  //添加三个结点 1.5（在1后） 2.5（在2后） 3.5（在3后）  Node n1dot5 = new Node("node1dot5");  Node n2dot5 = new Node("node2dot5");  Node n3dot5 = new Node("node3dot5");  ll.AddAfter(n1, n1dot5);  ll.AddAfter(n2, n2dot5);  ll.AddAfter(n3, n3dot5);  Console.WriteLine("========================");  //打印链表  ll.Print();  Console.WriteLine("========================");  //删除结点 2 和 3，将结点 2.5 的值改为 "ThisNodeIsModified!"  ll.Delete(n2);  ll.Delete(n3);  ll.Modify(n2dot5, "ThisNodeIsModified!");  Console.WriteLine("========================");  //打印链表  ll.Print();  Console.ReadLine();}