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   源码介绍

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多线程操作

[实例截图]

[核心代码]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace ThreadMore
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        // 发送数据包的类
        public class SendPackage
        {
            Package pack;      // 保存将被发送的数据包
            int quantity = 1;  // 数据包的个数

            // 发送数据包
            public SendPackage(Package p, int count)
            {
                pack = p;
                quantity = count;
            }
            public void ThreadRun()
            {
                // 发送指定数量的数据包
                for (int looper = 1; looper <= quantity; looper  )
                    pack.Send(looper);  // 调用数据包对象的发送方法
            }
        }

        // 接收数据包的类
        public class ReceivePackage
        {
            Package pack;
            int quantity = 1;

            // 接收数据包
            public ReceivePackage(Package p, int count)
            {
                pack = p;
                quantity = count;
            }
            public void ThreadRun()
            {
                int valReturned;

                // 接收指定数量的数据包
                for (int looper = 1; looper <= quantity; looper  )
                    valReturned = pack.Receive();
            }
        }

        // 数据包类**********************************************************************
        public class Package
        {
            int packContents;// 数据包的内容

            bool readerFlag = false;// 状态标识,初始值设置为false，表示只能发送而不能接收

            // 接收方法
            public int Receive()
            {
                //Monitor.Enter(this); // 获取排他锁
                lock (this)//等同于Monitor.Enter(this);Monitor.Exit(this);	
                {
                    if (!readerFlag)
                    {// 等待数据包到达
                        try
                        {
                            Monitor.Wait(this); // 释放对象上的锁并阻止当前线程，直到它重新获取该锁
                        }
                        catch (SynchronizationLockException e)
                        {
                            Console.WriteLine(e);
                        }
                        catch (ThreadInterruptedException e)
                        {
                            Console.WriteLine(e);
                        }
                    }
                    //Console.WriteLine("...接收（{0,2}）", packContents);
                    Console.WriteLine("...接收：{0}", packContents);
                    readerFlag = false;		// 表示接收结束
                    Monitor.Pulse(this);	// 通知其他线程
                }
                //Monitor.Exit(this);	    // 释放排他锁
                return packContents;
            }

            // 发送数据
            public void Send(int n)
            {
                //Monitor.Enter(this);
                lock (this)
                {
                    if (readerFlag)
                    {// 等待前一个数据包被接收
                        try
                        {
                            Monitor.Wait(this);
                        }
                        catch (SynchronizationLockException e)
                        {
                            Console.WriteLine(e);
                        }
                        catch (ThreadInterruptedException e)
                        {
                            Console.WriteLine(e);
                        }
                    }
                    packContents = n;
                    //Console.Write("发送（{0,2}）...", packContents);
                    Console.Write("发送：{0}...", packContents);
                    readerFlag = true;
                    Monitor.Pulse(this);
                }
                //Monitor.Exit(this);
            }
        }

        //**********************************************************************************
        //银行交易类
        private class Account
        {
            int balance;
            Random r = new Random();
            public Account(int initial)
            {
                balance = initial;
            }

            //取钱
            int Withdraw(int amount)
            {
                if (balance < 0)
                {
                    throw new Exception("余额为负！");
                }
                lock (this)
                {
                    if (balance >= amount)
                    {
                        Console.WriteLine("原有余额："   balance);
                        Console.WriteLine("支取余额：-"   amount);
                        balance = balance - amount;
                        Console.WriteLine("现有余额："   balance);
                        return amount;
                    }
                    else
                    {
                        return 0;//拒绝交易
                    }
                }
            }

            //测试交易
            public void DoTransactions()
            {
                //支取随机的金额100次
                for (int i = 0; i < 100; i  )
                {
                    Withdraw(r.Next(1, 100));
                }
            }
        }
        //**********************************************************************************


        private void button1_Click(object sender, EventArgs e)
        {
            Package pack = new Package();
            // 创建包含线程方法的对象
            SendPackage server = new SendPackage(pack, 20);
            ReceivePackage client = new ReceivePackage(pack, 20);

            // 创建两个线程对象，一个用于发送数据包，另一个用于接收数据包
            Thread producer = new Thread(new ThreadStart(server.ThreadRun));
            Thread consumer = new Thread(new ThreadStart(client.ThreadRun));

            try
            {
                // 启动两个线程
                producer.Start();
                consumer.Start();

                // 等待两个线程结束
                producer.Join();
                consumer.Join();
            }
            catch (ThreadStateException ex)
            {
                Console.WriteLine(e);
            }
            catch (ThreadInterruptedException ex)
            {
                Console.WriteLine(e);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //建立10个线程同时进行交易
            Thread[] threads = new Thread[10];
            Account acc = new Account(1000);
            for (int i = 0; i < 10; i  )
            {
                threads[i] = new Thread(new ThreadStart(acc.DoTransactions));
            }
            for (int i = 0; i < 10; i  )
            {
                threads[i].Start();
            }        
        }
    }
}