创建泛型类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Threading;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var dm = new DocumentManage<Document>();
            dm.AddDocument(new Document("Title A", "Sample A"));
            dm.AddDocument(new Document("Title B", "Sample B"));

            dm.DisplayAllDocuments();
            if (dm.IsDocumentAvailable)
            {
                Document d = dm.GetDocument();
                Console.WriteLine(d.Content);
            }
            Console.ReadKey();
        }
    }
    public class DocumentManage<TDocument> where TDocument:IDocument//限定TDocument一定要继承于IDocument
    {
        /// <summary>
        /// Queue:队列是一种特殊的线性表，它只允许在表的前端（front）进行删除操作，而在表的后端（rear）进行插入操作。
        /// 进行插入操作的端称为队尾，进行删除操作的端称为队头。队列中没有元素时，称为空队列。 
        /// </summary>
        private readonly Queue<TDocument> documentQueue = new Queue<TDocument>();
        public void AddDocument(TDocument doc)
        {
            //.NET LOCK方法使用:http://blog.sina.com.cn/s/blog_69f048190100xu2l.html
            lock (this)
            {
                documentQueue.Enqueue(doc);//入列
            }
        }
        public bool IsDocumentAvailable
        {
            get
            {
                return documentQueue.Count > 0;
            }
        }
        public TDocument GetDocument()
        {
            TDocument doc = default(TDocument);//default:引用类型会返回 null，对于数值类型会返回零
            lock (this)
            {
                doc = documentQueue.Dequeue();//出列
            }
            return doc;
        }
        public void DisplayAllDocuments()
        {
            foreach (TDocument doc in documentQueue)
            {
                Console.WriteLine(doc.Title);
            }
        }
    }
    public interface IDocument
    {
        string Title { get; set; }
        string Content { get; set; }
    }
    public class Document : IDocument
    {
        public Document()
        { }
        public Document(string title, string content)
        {
            this.Title = title;
            this.Content = content;
        }

        public string Title
        {
            get;
            set;
        }

        public string Content
        {
            get;
            set;
        }
        
    }
}