第三章单链表（带有头结点的尾插法实现）

/// <summary>
    /// 节点类
    /// </summary>
    /// <typeparam name="T"></typeparam>

class Node<T>
    {
        private T date; //数据域
        private Node<T> next;//指针域

        public T Date { get => date; set => date = value; }
        internal Node<T> Next { get => next; set => next = value; }

        public Node()
        {
            Next = null;
            Date = default(T);
        }

        public Node(T date,Node<T> next)
        {
            this.Date = date;
            this.Next = next;
        }

        public Node(T date)
        {
            Next = null;
            this.Date = date;
        }
        public Node(Node<T> next)
        {
            this.Date = default(T);
            this.Next = next;
        }
    }

/// <summary>
    /// 链表类
    /// </summary>
    class LinkList<T>
    {
        private Node<T> head; //头指针
        private int count;  //链表元素个数

        public LinkList()
        {
            head=new Node<T>();//指向头结点
            count = 0;
        }


        //尾插法创建链表
        public LinkList(params T[] list):this()
        {
            Node<T> last = head;
            for (int i = 0; i < list.Length; i++)
            {
                Node<T> newNode = new Node<T>(list[i]);
                last.Next = newNode;
                last = last.Next;
            }
            count = list.Length;
        }
       
      

        //遍历单链表的元素
        public void Traverse()
        {
            Node<T> temp = head;  
            for (int i = 0; i < count; i++)
            {             
                temp = temp.Next;
                Console.Write(temp.Date+"  ");
            }

            Console.WriteLine();
        }

//判断是否为空
        public bool IsEmepty()
        {
            return head.Next == null;
        }


        //获取链表长度
        public int GetLength()
        {
            return count;
        }

//获取元素索引位置
        public int Index(T elem)
        {
            Node<T> temp = head;
            for (int i = 0; i < count; i++)
            {
                temp = temp.Next;
                if (temp.Date.Equals(elem))
                {
                    return i;
                }

            }
             
            Console.WriteLine("elem:{0}不在链表中", elem);
            return -1;
        }

//通过索引器获取元素
        public T this[int index]
        {
            get
            {
                if (index>=count||index<0)
                {
                    throw new IndexOutOfRangeException();
                }
                Node<T> temp = head;
                for (int i = 0; i <=index; i++)
                {
                    temp = temp.Next;
                }

                return temp.Date;
            }
        }

//插入元素
        public void Insert(int index,T elem)
        {
            Node<T> temp = head;
            Node<T> newNode=new Node<T>(elem,null);         
            if (index >= count || index < 0)
            {
                throw new IndexOutOfRangeException();
            }                                 

               //当为空链表的时候
                if (temp.Next == null)
                {
                    temp.Next = newNode;
                    count++;
                  
                }

                else
               {
                 for (int i = 0; i < index; i++)
                  {
                    temp = temp.Next;
                 }
                newNode.Next = temp.Next;
                temp.Next = newNode;
                count++;
               }     
        }

//删除元素
        public void Delete(int index)
        {
            Node<T> temp = head;
            if (head.Next == null)
            {
                Console.WriteLine("空表无法删除");
            }
            if (index >= count || index < 0)
            {
                throw new IndexOutOfRangeException();
            }
        
            for (int i = 0; i < index; i++)
            {
                temp = temp.Next;
            }

            temp.Next = temp.Next.Next;
            count--;
        }
    }

LinkList<int> sum=new LinkList<int>(1,2,5,8,5,888,555);
            sum.Traverse();
            Console.WriteLine(sum.IsEmepty());
            Console.WriteLine(sum.GetLength());
            Console.WriteLine(sum.Index(8));
            Console.WriteLine(sum[6]);
            //sum.Insert(2, 120);
            //sum.Traverse();
            sum.Delete(100);
            sum.Traverse();
            Console.ReadKey();