C#双向链表LinkedList排序 C#双向链表LinkedList排序实现方法

/// <summary>
/// 打印链表各结点信息
/// </summary>
/// <param name="ll"></param>
private static void PrintLinkedList(LinkedList<double> ll, string title = "")
{
 //打印标题
 Console.WriteLine(string.Format("-- {0} --",
  string.IsNullOrWhiteSpace(title) ? "打印链表" : title));
 //逐个结点打印链表
 LinkedListNode<double> lln = ll.First;
 int counter = 0;
 while (lln != null)
 {
  Console.WriteLine(string.Format("第 {0} 个结点值为 {1}",
   counter++, lln.Value.ToString("#0.0")));
  lln = lln.Next;
 }
}
/// <summary>
/// 返回一个排序后的链表
/// </summary>
/// <param name="linkedlist">待排序链表</param>
/// <param name="isAsc">true:升序/false:降序</param>
/// <returns></returns>
private static LinkedList<double> SortLinkedList(
 LinkedList<double> linkedlist, bool isAsc = true)
{
 LinkedList<double> result = new LinkedList<double>();
 foreach (double nodevalue in linkedlist)
 {
  LinkedListNode<double> lln = result.First;
  while (true)
  {
   if (isAsc) //升序排列时情况
   {
    if (lln == null)
    {
     result.AddLast(nodevalue);
     break;
    }
    else if (nodevalue <= lln.Value)
    {
     result.AddBefore(lln, nodevalue);
     break;
    }
    else
    {
     lln = lln.Next;
    }
   }
   else //降序排列时情况
   {
    if (lln == null)
    {
     result.AddLast(nodevalue);
     break;
    }
    else if (nodevalue >= lln.Value)
    {
     result.AddBefore(lln, nodevalue);
     break;
    }
    else
    {
     lln = lln.Next;
    }
   }
  }
 }
 return result;
}

static void Main(string[] args)
{
 //测试用数组
 double[] array = new double[] 
 {
  3.5, 2.5, 6.2, 8.0, 1.3, 
  4.6, 5.5, 2.7, 8.4, 9.7
 };
 //生成链表ll
 LinkedList<double> ll = new LinkedList<double>();
 for (int i = 1; i < array.Length; i++)
 {
  ll.AddLast(array[i]);
 }
 //打印链表ll
 PrintLinkedList(ll, "原链表");
 //对链表ll进行排序（升序）
 ll = SortLinkedList(ll);
 //打印排序后的链表ll
 PrintLinkedList(ll, "链表（升序）");
 //对链表ll进行排序（降序）
 ll = SortLinkedList(ll, false);
 //打印排序后的链表ll
 PrintLinkedList(ll, "链表（降序）");
 Console.ReadLine();
}