Question

我编写了一个C＃代码，用于将数据插入双向链表并删除节点。它正在工作，我可以从最后一个节点到第一个节点遍历列表。但我不能遍历从第一个节点到最后一个节点的列表。我找不到我犯的错误。以下是我的代码。

class Node
{
public string data { get; set; }
public Node next { get; set; }
public Node previous { get; set; }

public Node(string data)//first node)
{
    this.data = data;
    this.next = null;
    this.previous = null;
}
public Node(string data, Node next,Node previous)
{
    this.data = data;
    this.next = next;
    this.previous = previous;
}

}

class doublyLinkedList
{
private Node first;
private Node last;
private int size;
public doublyLinkedList()
{
    this.first = null;
    this.last = null;
    this.size = 0;
}
public bool isEmpty
{
    get { return this.size == 0; }
}
public int count
{
    get { return this.size; }
}
public void Add(string o)
{
    Node current = this.last;
    if (this.isEmpty)
    {
        this.first = new Node(o);
        this.last = new Node(o);
    }
    else
    {
        current.next = new Node(o, current.next,current);
        last = current.next;
        Console.WriteLine("first " + first.data + "last " + last.data + "previous " + last.previous.data);

    }size++;
}
public object getFirst()
{
    return first.data;
}
public string remove()
{
    Node current = this.last;
    current.previous.next = null;
    object removedElement = current.data;
    string reEle = ((String)(removedElement).ToString());
    current = current.previous;
    size--;
    return reEle;
}

public void TraverseFront()
{
    Node current = this.first;
    string str = current.data;
    Console.WriteLine("first " + str);
    Node current1 = first.next;
    string str1 = first.next.data;
    string question = str + str1;
    Console.WriteLine(question) 
}

}

Answer 1

您插入第一个对象时出现问题。您需要将最后一个设置为与第一个相同的实例，因为当您断开第一个对象时（this.first.next始终为null），请将其更改为：

this.last = new Node(o);

为：

this.last = this.first;

双向LinkedList遍历

1 个答案: