C#双向链表实现：在当前节点后插入新数据的方法Insert()

目录

1.定义一个泛型节点类并自动属性

2.定义链表类，并实现Append、Print、MoveFirst、 Insert

3.Main方法

1.定义一个泛型节点类并自动属性

/// <summary>
/// 定义泛型节点类
/// </summary>
/// <typeparam name="T">泛型运算符</typeparam>
/// <param name="value">泛型参数</param>
public class ListNode<T>(T value)
{public T Object { get; set; } = value;public ListNode<T>? Next { get; set; }public ListNode<T>? Previous { get; set; }
}

2.定义链表类，并实现Append、Print、MoveFirst、 Insert

/// <summary>
/// 定义链表类
/// </summary>
public class LinkedList
{private ListNode<int>? _head;private ListNode<int>? _tail;private ListNode<int>? _current;public ListNode<int>? Current { get => _current; set => _current = value; }/// <summary>/// 追加节点到Append方法/// </summary>/// <param name="value"></param>public void Append(int value){var newNode = new ListNode<int>(value);if (_head == null){_head = newNode;_tail = newNode;}else{_tail!.Next = newNode;newNode.Previous = _tail;_tail = newNode;}}/// <summary>/// 输出各节点/// </summary>public void Print(){var current = _head;while (current != null){Console.WriteLine(current.Object);current = current.Next;}}/// <summary>///移动指针到链表头/// </summary>public void MoveFirst(){if (_head != null){_current = _head;}}/// <summary>/// 在当前节点后面插入新数据/// </summary>/// <param name="value">待插入的数据</param>public void Insert(int value){// 创建一个新的节点var newNode = new ListNode<int>(value);// 如果链表为空，将新节点设置为头节点if (_head == null){_head = newNode;_current = newNode;return;}// 找到当前节点var current = _current;if (current == null){//current = _head;_current = _head;while (_current.Next != null){_current = _current.Next;}current = _current;}// 在当前位置插入新节点newNode.Next = current.Next;newNode.Previous = current;current.Next = newNode;_current = newNode;}

3.Main方法

 class Program{static void Main(string[] args){ArgumentNullException.ThrowIfNull(args);var linkedList = new LinkedList();linkedList.Append(5);linkedList.Append(2);linkedList.Append(8);linkedList.Append(1);linkedList.Print();Console.WriteLine("*初始化数据*");linkedList.MoveFirst();linkedList.Insert(3);linkedList.Print();Console.WriteLine("*头结点后插入3*");}}

         运行结果：

//运行结果：
/*
5
2
8
1
*初始化数据*
5
3
2
8
1
*头结点后插入3**/