c#中链表+优先级的示例分析

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==================================Document.cs

 using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication4{    public class Document//文档类    {        public string Title { get; private set; }//标题        public string Content { get; private set; }//内容        public byte Priority { get; private set; }//优先级        public Document(string title, string content, byte priority)        {            this.Title = title;            this.Content = content;            this.Priority = priority;        }        public override string ToString()        {            return string.Format("标题：{0}，内容：{1}，优先级：{2}", this.Title, this.Content, this.Priority);        }    }}

==================================PriorityDocumentManage.cs【核心】

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Collections;namespace ConsoleApplication4{    public class PriorityDocumentManage:IEnumerable    {        //链表        private readonly LinkedList documentList;        //优先级节点        private readonly List> priorityNodes;        public PriorityDocumentManage()        {            //初始化链表            documentList = new LinkedList();            //初始化优先级节点            priorityNodes = new List>();            //设置优先级为0~9            for (int i = 0; i < 10; i++)            {                priorityNodes.Add(new LinkedListNode(null));            }        }        //向链表中添加文档        public void AddDocument(Document d)        {            if (d == null) throw new ArgumentNullException("对象不能为空");            AddDcoumentToPriorityNode(d, d.Priority);        }        private void AddDcoumentToPriorityNode(Document doc, int priority)        {            if (priority > 9 || priority < 0) throw new ArgumentException("优先级溢出");            if (priorityNodes[priority].Value == null)//该优先级节点的值为空，说明链表中还没有存在该优先级的元素            {                --priority;                if (priority >= 0)//继续往更低的优先级下面找                {                    AddDcoumentToPriorityNode(doc, priority);                }                else//进入此方法，说明是第一个插入链表的元素                {                    documentList.AddLast(doc);//将元素插入到链表的最后位置                    priorityNodes[doc.Priority] = documentList.Last;//把传入的元素赋值给对应优先级的优先级节点                }            }            else            {                LinkedListNode currentDoc = priorityNodes[priority];                if (doc.Priority == priority)//优先级节点存对应的优先级已存在元素【优先级节点只存对应优先级最后添加的元素】                {                    documentList.AddAfter(currentDoc, doc);//将元素插入到对应元素的后面                    priorityNodes[doc.Priority] = currentDoc.Next;//将对应的优先级节点赋值为对应优先级最后添加的元素                }                else//说明不是传入元素对应的优先级节点                {                                        while (currentDoc.Previous != null && currentDoc.Previous.Value.Priority == priority)//找到该优先级最前面的元素                    {                        currentDoc = currentDoc.Previous;                    }                    documentList.AddBefore(currentDoc, doc);//插入该元素的前面                    priorityNodes[doc.Priority] = currentDoc.Previous;//将对应的优先级节点赋值为对应优先级最后添加的元素                }            }        }        public IEnumerator GetEnumerator()        {            return documentList.GetEnumerator();        }        //找到第一个元素，并删除该元素        public Document GetDocument()        {            Document d = documentList.First.Value;            documentList.RemoveFirst();            return d;        }    }}

==================================主程序

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication4{    class Program    {        static void Main(string[] args)        {            PriorityDocumentManage pdm = new PriorityDocumentManage();            pdm.AddDocument(new Document("a", "a", 5));            pdm.AddDocument(new Document("b", "b", 5));            pdm.AddDocument(new Document("c", "c", 8));            pdm.AddDocument(new Document("d", "d", 5));            pdm.AddDocument(new Document("e", "e", 6));            foreach (var item in pdm)            {                Console.WriteLine(item);            }            Console.ReadKey();        }    }}

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