Question

我正在尝试通过引入线程来提高应用程序的性能（请参阅我的earlier问题）。我已经用XML消息填充了一个Queue（of String），现在我想设置两个线程将这些消息发布到web服务器上。此过程需要确保每条消息仅发布一次。 BackgroundWorker（或两个）是否适合这个？

我不知道从哪里开始，我看过的一些样本没有多大意义！任何帮助都感激不尽。

Answer 1

using System;
using System.Collections.Generic;
using System.Threading;

namespace QueueTest
{
    class QueueTest 
    {
        [STAThread]
        static void Main(string[] args)
        {
            QueueTest d = new QueueTest();
            d.Run();
        }

        Queue<string> m_Queue=new Queue<string>();

        QueueTest()
        {
            for (int i = 0; i < 10000; i++)
            {
                m_Queue.Enqueue("Message " + i);
            }
        }

        private void Run()
        {
            //Create and start threads
            Thread t1 = new Thread(new ThreadStart(QueueReader));
            Thread t2 = new Thread(new ThreadStart(QueueReader));
            t1.Start();
            t2.Start();
            t1.Join();
            t2.Join();
        }

        //Thread function
        private void QueueReader()
        {
            while (true)
            {
                string msg = null;
                lock (m_Queue)
                {
                    if (m_Queue.Count > 0)
                        msg = m_Queue.Dequeue();
                    else
                    {
                        return;
                        //whatever you want to do when a queue is empty, for instance
                        //sleep or exit or wait for event. 
                        //but you have to do something here to avoid empty loop with 100% CPU load
                        Thread.Sleep(1000);
                    }
                }
                //this is where you post your message 
                //it's important to do this outside lock()
                if (msg != null) ProcessMessage(msg);
            }
        }

        private void ProcessMessage(string msg)
        {
            Console.WriteLine(msg);
            Thread.Sleep(500);
        }
    }
}

Answer 2

此外，您可以使用名为Parallel Extensions Framework的http://blogs.msdn.com/pfxteam/库中的ConcurrentQueue<T>。

任何人都可以显示两个线程的样本从队列（字符串）读取消息？

2 个答案: