复制另一个链表

基本上我有一个小问题。我就是做不到。我到处都找过了。我正在尝试使用Concat方法复制列表

public void Concat(LinkListGen<T> list2)
{
    LinkGen<T> temp = list2.list;
    while (temp != null)
    {
        AppendItem(temp.Data);
        temp = temp.Next;
    }
}

可以正常工作

然而，我的Copy方法没有任何运气:

public void Copy(LinkListGen<T> list2)
{
    LinkGen<T> temp = list2.list;
    while (temp != null)
    {
        Concat(list2);
        AppendItem(list2.list.Data);
        temp = temp.Next;
    }
}

我知道这段代码可能很愚蠢，我只是一直在改变代码/实验和尝试。

当我执行代码时，没有显示任何内容。

list2.AddItem(56);
list2.AddItem(88);
list2.AddItem(17);
list.AddItem(40);
list.AddItem(11);
list.AddItem(77);
list3.Copy(list2);
list3.Copy(list);
System.Console.WriteLine("Copy List" + list3.DisplayItems());

本质上我想要这样的输出(可能输入的数字顺序错了):

Copy List 56 88 17 40 11 77

谢谢。

编辑-我是一个白痴，忘记了AppendItem方法。

public void AppendItem(T item)
{
    LinkGen<T> temp = list;
    if (list == null)
    {
        new LinkGen<T>(item, null);
    }
    else
    {
        while (temp.Next != null)
        {
            temp = temp.Next;
        }
        temp.Next = new LinkGen<T>(item, null);
    }
}

编辑,

    class LinkGen<T>
{
    private T data;
    private LinkGen<T> next;
    public LinkGen(T item)
    {
        data = item;
        next = null;
    }
    public LinkGen(T item, LinkGen<T> list)
    {
        data = item;
        next = list;
    }
    public LinkGen<T> Next
    {
        set { this.next = value; }
        get { return this.next; }
    }
    public T Data
    {
        set { this.data = value; }
        get { return this.data; }
    }
}

}

   class LinkListGen<T> where T : IComparable
{
    private LinkGen<T> list;

    public LinkListGen()
    {
        this.list = null;
    }
    public void AddItem(T item)
    {
        list = new LinkGen<T>(item, list);
    }
    public string DisplayItems() //write items to string and return
    {
        LinkGen<T> temp = list;
        string buffer = "";
        while (temp != null) // move one link and add head to the buffer
        {
            buffer += temp.Data + "";
            temp = temp.Next;
        }
        return buffer;
    }
    public int NumberOfItems() // returns number of items in list
    {
        LinkGen<T> temp = list;
        int count = 0;
        while (temp != null) // move one link and add 1 to count
        {
            count++;
            temp = temp.Next;
        }
        return count;
    }

    public void RemoveItem(int item)
    {
        LinkGen<T> current = list;
        LinkGen<T> previous = null;
        while (current != null)
        {
            if (current.Data.Equals(item))
            {
                if (previous != null)
                {
                    previous.Next = current.Next;
                    current = current.Next;
                }

                else
                {
                    previous = current;
                    current = current.Next;
                    list = current;
                }
            }
            else
                previous = current;
            current = previous.Next;
        }
    }

    public void InsertInOrder(T item)
    {
        LinkGen<T> temp = list;
        if (list == null || list.Data.CompareTo(item) < 0)
        {
            list = new LinkGen<T>(item, this.list);
        }
        else
        {
            while (temp != null)
            {
                if (list.Data.CompareTo(item) == 0 || list.Data.CompareTo(item) > 0)
                {
                    temp.Next = new LinkGen<T>(item, temp.Next);
                    temp = null;
                }
                else
                {
                    temp = temp.Next;
                }
            }

        }
    }

    public void AppendItem(T item)
    {
        LinkGen<T> temp = list;
        if (list == null)
        {
            new LinkGen<T>(item, null);
        }
        else
        {
            while (temp.Next != null)
            {
                temp = temp.Next;
            }
            temp.Next = new LinkGen<T>(item, null);
        }
    }

    public void Concat(LinkListGen<T> list2)
    {
        LinkGen<T> temp = list2.list;
        while (temp != null)
        {
            AppendItem(temp.Data);
            temp = temp.Next;
        }
    }

class LinkListGen<T> where T : IComparable
{
    private LinkGen<T> list;
    public LinkListGen() {  }
    private LinkGen<T> LastNode ()
    {
        var temp = list;
        while (temp != null && temp.Next != null)
            temp = temp.Next;
        return temp;
    } 
    public void AppendItem(T item)
    {
        if (list == null)
            list = new LinkGen<T>(item, null);
        else
        {
            LinkGen<T> temp = LastNode();
            temp.Next = new LinkGen<T>(item, null);
        }
    }
    public void Concat(LinkListGen<T> list2)
    {
        if (list2 == null)
            return;
        LinkGen<T> temp = list2.list;
        while (temp != null)
        {
            AppendItem(temp.Data);
            temp = temp.Next;
        }
    }
    public void Copy(LinkListGen<T> list2)
    {
        Concat(list2);
    }
    class LinkGen<T2>
    {
        public LinkGen(T2 item): this(item, null) { }
        public LinkGen(T2 item, LinkGen<T2> list)
        {
            Data = item;
            Next = list;
        }
        public LinkGen<T2> Next { set;  get; }
        public T2 Data { set ; get ; }
    }
}

  public void Copy(LinkListGen<T> list2)
    {
        LinkGen<T> temp = list2.list;
        while (temp != null)
        {
            AppendItem(temp.Data);
            temp = temp.Next;
        }
    }