C#多线程示例－访问量增加工具

 

     近日闲来无事，就做了一个多线程网页访问器，系统主要是完成特定页面的打开，并不显示，主要包括如下部分：

     （1）页面请求部分DoPage：

namespace Visits
{
    public class DoPage
    {
        string strURL = string.Empty;//待访问页面地址

        public DoPage(string url)
        {
            this.strURL = url;
        }

 

        public void SendRequest()
        {
            try
            {
                WebRequest wrt = WebRequest.Create(this.strURL.Trim());
                wrt.Credentials = CredentialCache.DefaultCredentials;
                WebResponse wrp = wrt.GetResponse();               
                string content = new StreamReader(wrp.GetResponseStream(), Encoding.Default).ReadToEnd();
                content = string.Empty;
            }
            catch (WebException webEx)
            {
                //Console.WriteLine(webEx.Message.ToString());
            }

        }

    }
}

 

    （2）线程管理器，主要和进度条进行交互的模块ThreadMethod：

namespace Visits
{
    class ThreadMethod
    {

        int totalcount = 0;
        ArrayList DelInstance = new ArrayList();

        static ArrayList stObjDelIns = new ArrayList();
        static int stCurrentCount = 0;
        static private Object lockN = new Object(); 
        //private System.Threading.Thread[] threadlst = new System.Threading.Thread[10];

        public ThreadMethod(ArrayList lst)
        {
                ThreadMethod.stObjDelIns = lst;
        }

        public ThreadMethod()
        {

        }

        /// <summary>
        /// 线程开始事件
        /// </summary>
        static public event EventHandler threadStartEvent;
        /// <summary>
        /// 线程执行时事件
        /// </summary>
        static public event EventHandler threadEvent;
        /// <summary>
        /// 线程结束事件
        /// </summary>
        static public event EventHandler threadEndEvent;

        static public void Run()
        {

            int count = ThreadMethod.stObjDelIns.Count;
            DoPage dp = null;
            threadStartEvent.Invoke(count, new EventArgs());//通知主界面,我开始了,count用来设置进度条的最大值
            while (ThreadMethod.stObjDelIns.Count > 0)
            {
                dp = (DoPage)ThreadMethod.stObjDelIns[0];
                //dp.GetPageTask();
                dp.SendRequest();
                try
                {
                    ThreadMethod.stObjDelIns.RemoveAt(0);
                }
                catch (Exception ex)
                {
                    //
                }
                threadEvent.Invoke(ThreadMethod.stCurrentCount + 1, new EventArgs());//通知主界面我正在执行,i表示进度条当前进度
                Thread.Sleep(1);
                if (ThreadMethod.stObjDelIns.Count == 0)
                {
                    threadEndEvent.Invoke(new object(), new EventArgs());//通知主界面我已经完成了
                }
                ThreadMethod.stCurrentCount++;
            }

        }

       
    }
}

 

      （3）form：

public partial class Visits : Form
    {
        int totalcount = 0;
        ArrayList DelInstance = new ArrayList();
        private System.Threading.Thread[] threadlst = new System.Threading.Thread[10];

        ///////////////////////////////////////////////////////////////////////////////////////////////
        //线程开始的时候调用的委托
        private delegate void maxValueDelegate(int maxValue);
        //线程执行中调用的委托
        private delegate void nowValueDelegate(int nowValue);
        private delegate void msgValueDelegate();

        /// <summary>
        /// 线程完成事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void method_threadEndEvent(object sender, EventArgs e)
        {
            CloseThread();
            MessageBox.Show("数据处理完成！");
            msgValueDelegate msg = new msgValueDelegate(setMsg);
            this.Invoke(msg, null);
           
        }

        /// <summary>
        /// 线程执行中的事件,设置进度条当前进度
        /// 但是我不能直接操作进度条,需要一个委托来替我完成
        /// </summary>
        /// <param name="sender">ThreadMethod函数中传过来的当前值</param>
        /// <param name="e"></param>
        void method_threadEvent(object sender, EventArgs e)
        {
            int nowValue = Convert.ToInt32(sender);
            nowValueDelegate now = new nowValueDelegate(setNow);
            this.Invoke(now, nowValue);
        }

        /// <summary>
        /// 线程开始事件,设置进度条最大值
        /// 但是我不能直接操作进度条,需要一个委托来替我完成
        /// </summary>
        /// <param name="sender">ThreadMethod函数中传过来的最大值</param>
        /// <param name="e"></param>
        void method_threadStartEvent(object sender, EventArgs e)
        {
            int maxValue = Convert.ToInt32(sender);
            maxValueDelegate max = new maxValueDelegate(setMax);
            this.Invoke(max, maxValue);
        }

        /// <summary>
        /// 被委托调用,专门设置进度条最大值的
        /// </summary>
        /// <param name="maxValue"></param>
        private void setMax(int maxValue)
        {
            this.progressBar1.Maximum = maxValue;
        }

        /// <summary>
        /// 被委托调用,专门设置进度条当前值的
        /// </summary>
        /// <param name="nowValue"></param>
        private void setNow(int nowValue)
        {
            this.progressBar1.Value = nowValue;
            this.lbdecount.Text = nowValue.ToString();
            this.lbper.Text = (((float)nowValue / (float)this.totalcount) * 100).ToString("F2") + "%";
           
        }

        /// <summary>
        /// 被委托调用,专门设置处理结束的报告信息
        /// </summary>
        private void setMsg()
        {
            this.lbmsg.Text = "数据处理完成！";
        }

        ///////////////////////////////////////////////////////////////////////////////////////////////

        public Visits()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (!tbaddress.Text.Trim().Equals("") && !tbcount.Text.Trim().Equals(""))
            {
                //启动初始化过程
                int count = 0;
                try
                {
                    count = Convert.ToInt32(tbcount.Text.Trim());
                }
                catch (Exception ex)
                {
                    MessageBox.Show("请输入数字！");
                    tbcount.Text = "50";
                    return;
                }
                this.totalcount = count;
                this.lbdecount.Text = "0";
                this.DelInstance = ConfigPage(this.totalcount);

                //定义处理模块
                ThreadMethod method = new ThreadMethod(this.DelInstance);
                //订阅事件
                ThreadMethod.threadStartEvent += new EventHandler(method_threadStartEvent);
                ThreadMethod.threadEvent += new EventHandler(method_threadEvent);
                ThreadMethod.threadEndEvent += new EventHandler(method_threadEndEvent);

                CloseThread();
                //初始化线程
                for (int t = 0; t < 10; t++)
                {
                    threadlst[t] = new System.Threading.Thread(ThreadMethod.Run);
                }
                lbmsg.Text = "初始化完成，开始进入处理流程......";

                ////初始化结束

                //启动线程处理数据
                for (int i = 0; i < 10; i++)
                {
                    threadlst[i].Start();
                }

            }
            else
            {
                lbmsg.Text = "请输入网页地址！";
            }
        }

        private ArrayList ConfigPage(int count)
        {
            if (count < 0) return null;

            ArrayList ts = new ArrayList();
            for (int i = 0; i < count; i++)
            {
                DoPage vpage = new DoPage(tbaddress.Text.Trim());
                ts.Add(vpage);
            }
            return ts;
        }

        private void CloseThread()
        {
            for (int i = 0; i < 10; i++)
            {
                if (threadlst[i] != null)
                {
                    if (threadlst[i].IsAlive)
                    {
                        threadlst[i].Abort();
                    }
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            CloseThread();
        }

    }