C# Producer Consumer （生产者消费者模式）demo

  第一套代码将producer Consumer的逻辑写到from类里了，方便在demo的显示界面动态显示模拟生产和消费的过程。
     第二套代码将producer Consumer的逻辑单独写到一个类中，使用委托的方法在from中回显生产消费的过程。
     Demo中均以3个线程作为消费者，1个线程作为生产者为例。 
     由于是C#新手，有不对的地方望不吝赐教。

     先贴下窗口截图，动态生产消费进度显示

第一套代码：

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 ProducerConsumerDemo
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            StopFlag = false;
            StartDemo();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            StopFlag = true;
        }

        public class TaskInfo
        {
            public int Index;

            public TaskInfo()
            {
            }

            public TaskInfo(int index)
            {
                this.Index = index;
            }
        }

        private static bool StopFlag = false;
        private int ProducerNumber = 1;
        private int ConsumerNumber = 3;

        // 共用任务队列
        private Queue<TaskInfo> TaskQueue = new Queue<TaskInfo>();
        private Semaphore TaskSemaphore = new Semaphore(0, 256);

        private object myLock = new object();

        private void StartDemo()
        {
            StartProducer(ProducerNumber);
            Thread.Sleep(2000);
            StartConsumer(ConsumerNumber);
        }

        private void StartProducer(int num)
        {
            for (int i = 0; i < num; i++)
            {
                Thread t = new Thread(new ThreadStart(Producer));
                t.Name = "Producer_" + (i + 1);
                t.Start();
            }
        }

        private void StartConsumer(int num)
        {
            for (int i = 0; i < num; i++)
            {
                Thread t = new Thread(new ParameterizedThreadStart(this.Consumer));
                t.Name = "Consumer_" + (i + 1);
                t.IsBackground = true;
                t.Start(i + 1);
            }
        }

        // 线程间控件调用，需要使用委托
        public delegate void ProducerTextDelegate(string AddStr);
        public delegate void ComsumerTextDelegate(int Index, string AddStr);

        // 生产者
        private void Producer()
        {
            int i = 0;
            while (!StopFlag)
            {
                TaskInfo Task = new TaskInfo(++i);
                lock (myLock)   // 任务队列为临界资源，需要锁
                {
                    TaskQueue.Enqueue(Task);
                }
                TaskSemaphore.Release(1);   // 每添加一个任务，信号量加1

                string AddText = String.Format("Task {0} was Produced.
", Task.Index);
                ChangeProducerText(AddText);    // 修改textBox输出

                Thread.Sleep(1000);
            }
        }

        // 消费者
        private void Consumer(object data)
        {
            int Index = (int)data;
            TaskInfo GetTask = null;

            while (true)
            {
                TaskSemaphore.WaitOne();
                lock (myLock)
                {
                    GetTask = TaskQueue.Dequeue();
                }

                string AddStr = String.Format("Consumer {0} take Task {1}
", Index, GetTask.Index);

                ChangeConsumerText(Index, AddStr);
                Random r = new Random();
                Thread.Sleep(r.Next(5) * 1000);     // 休眠随机事件，模拟实际任务的每个任务的不同时常
                // 此处应为任务处理
            }
        }

        private void ChangeProducerText(string AddStr)
        {
            if (textBox1.InvokeRequired)
            {
                ProducerTextDelegate pd = new ProducerTextDelegate(ChangeProducerText);
                textBox1.Invoke(pd, new object[] { AddStr });
            }
            else
            {
                textBox1.AppendText(AddStr);
            }
        }

        private void ChangeConsumerText(int Index, string AddStr)
        {
            TextBox currentTextBox = null;
            switch (Index)
            {
                case 1:
                    currentTextBox = this.textBox2;
                    break;
                case 2:
                    currentTextBox = this.textBox3;
                    break;
                case 3:
                    currentTextBox = this.textBox4;
                    break;
                default:
                    break;
            }

            if (currentTextBox.InvokeRequired)
            {
                ComsumerTextDelegate cd = new ComsumerTextDelegate(ChangeConsumerText);
                currentTextBox.Invoke(cd, new object[] { Index, AddStr });
            }
            else
            {
                currentTextBox.AppendText(AddStr);
            }
        }
    }
}

第二套代码：

// Form1.cs
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 ProducerConsumerDemo
{
    // 定义修改输出的委托
    public delegate void ShowTextDelegate(int Index, string Addstr);

    public partial class Form1 : Form
    {
        Work work = null;

        public Form1()
        {
            InitializeComponent();
            work = new Work();
            work.ShowTextEvent += new ShowTextDelegate(ChangeTextValue);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            work.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            work.Stop();
        }

        // new Work 中再起的子线程调用的ShowTextDelegate委托事件，所以需要委托才能调用textBox控件
        public delegate void ChangeTextDelegate(int Index, string AddStr);

        private void ChangeTextValue(int Index, string AddStr)
        {
            TextBox ChangeTextBox = null;
            switch (Index)
            {
                case 1:
                    ChangeTextBox = this.textBox1;
                    break;
                case 2:
                    ChangeTextBox = this.textBox2;
                    break;
                case 3:
                    ChangeTextBox = this.textBox3;
                    break;
                case 4:
                    ChangeTextBox = this.textBox4;
                    break;
                default:
                    break;
            }

            if (ChangeTextBox.InvokeRequired)
            {
                ChangeTextDelegate pd = new ChangeTextDelegate(ChangeTextValue);
                ChangeTextBox.Invoke(pd, new object[] { Index, AddStr });
            }
            else
            {
                ChangeTextBox.AppendText(AddStr);
            }

        }
    }

}

// Work.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace ProducerConsumerDemo
{
    public class Work
    {
        public Work()
        {
            StopFlag = false;
        }

        public void Start()
        {
            StopFlag = false;
            StartDemo();
        }

        public void Stop()
        {
            StopFlag = true;
        }

        public class TaskInfo
        {
            public int Index;

            public TaskInfo()
            {
            }

            public TaskInfo(int index)
            {
                this.Index = index;
            }
        }

        private static bool StopFlag = false;
        private int ProducerNumber = 1;
        private int ConsumerNumber = 3;

        private Queue<TaskInfo> TaskQueue = new Queue<TaskInfo>();
        private Semaphore TaskSemaphore = new Semaphore(0, 256);

        private object myLock = new object();

        public event ShowTextDelegate ShowTextEvent;

        private void StartDemo()
        {


            StartProducer(ProducerNumber);
            Thread.Sleep(2000);
            StartConsumer(ConsumerNumber);
        }

        private void StartProducer(int num)
        {
            for (int i = 0; i < num; i++)
            {
                Thread t = new Thread(new ThreadStart(Producer));
                t.Name = "Producer_" + (i + 1);
                t.Start();
            }
        }

        private void StartConsumer(int num)
        {
            for (int i = 0; i < num; i++)
            {
                Thread t = new Thread(new ParameterizedThreadStart(this.Consumer));
                t.Name = "Consumer_" + (i + 1);
                t.IsBackground = true;
                t.Start(i + 1);
            }
        }

        private void Producer()
        {
            int i = 0;
            while (!StopFlag)
            {
                TaskInfo Task = new TaskInfo(++i);
                lock (myLock)
                {
                    TaskQueue.Enqueue(Task);
                }
                TaskSemaphore.Release(1);

                string AddText = String.Format("Task {0} was Produced.
", Task.Index);
                ShowTextEvent.Invoke(1, AddText);

                Thread.Sleep(1000);
            }
        }

        private void Consumer(object data)
        {
            int Index = (int)data;
            TaskInfo GetTask = null;

            while (true)
            {
                TaskSemaphore.WaitOne();
                lock (myLock)
                {
                    GetTask = TaskQueue.Dequeue();
                }

                string AddStr = String.Format("Consumer {0} take Task {1}
", Index, GetTask.Index);
                ShowTextEvent.Invoke(Index + 1, AddStr);
                Random r = new Random();
                Thread.Sleep(r.Next(5) * 1000);
            }
        }
    }
}