C#实现双向链表
/// <summary>
    /// 双向链表节点类
    /// </summary>
    /// <typeparam name="T">节点中的存放的数据类型</typeparam>
    public class Node<T>
    {
        /// <summary>
        /// 当前节点的数据
        /// </summary>
        T data;
        /// <summary>
        /// 节点中存放的数据
        /// </summary>
        public T Data
        {
            get { return this.data; }
            set { this.data = value; }
        }
        /// <summary>
        /// 当前节点的下一个节点
        /// </summary>
        Node<T> next;
        /// <summary>
        /// 下一个节点
        /// </summary>
        public Node<T> Next
        {
            get { return this.next; }
            set { this.next = value; }
        }
        /// <summary>
        /// 当前节点的上一个节点
        /// </summary>
        Node<T> prev;
        /// <summary>
        /// 上一个节点
        /// </summary>
        public Node<T> Prev
        {
            get { return prev; }
            set { prev = value; }
        }
        /// <summary>
        /// 无参构造：数据为默认值，下一个节点为null，上一个节点也为null
        /// </summary>
        public Node()
        {
            this.data = default(T);
            this.next = null;
            this.prev = null;
        }
        /// <summary>
        /// 构造方法：数据为传过来的t，下一个节点为null，上一个节点也为null
        /// </summary>
        /// <param name="t">传入的元素值</param>
        public Node(T t)
        {
            this.data = t;
          &n