简单多线程并发操作

来源：互联网发布：软件开发费税率2016年编辑：程序博客网时间：2024/06/07 06:17

如何实现多线程并发执行一组数据？这里主要用到了先入先出的Queue。 namespace System.Collections.Specialized;

原理：把要执行的参数等放入Queue里面，在执行的时候从Queue取出并且移除，这样也就做到了数据不会重复操作。

下面以采集500W的时时彩数据为例....

   private Queue<string> needSpideData;        private delegate void SetRichText(string txt,bool b);        private void SetText(string txt,bool b)        {            if (richTextBox1.InvokeRequired)            {                SetRichText srt = new SetRichText(SetText);                this.Invoke(srt, new object[] { txt,b });            }            else            {                if (b)                    richTextBox1.Text += txt + "\n";                else                    richTextBox2.Text += txt + "\n";                            }        }        private void button1_Click(object sender, EventArgs e)        {            richTextBox1.Text = "开始采集....  \n";            richTextBox2.Text = "";            int day = (dateTimePicker2.Value - dateTimePicker1.Value).Days + 1;            needSpideData = new Queue<string>();            for (int i = 0; i < day; i++)            {                needSpideData.Enqueue(string.Format("http://kaijiang.500wan.com/static/public/ssc/xml/qihaoxml/{0}.xml", dateTimePicker1.Value.AddDays(i).ToString("yyyyMMdd")));            }            for (int i = 0; i < 10; i++)            {                Thread t = new Thread(new ThreadStart(Spide));                t.Start();            }        }        private void Spide()        {            try            {                if (needSpideData.Count > 0)                {                    var url = needSpideData.Dequeue();                    switch (ToGet.SaveSql(url))//操作数据库                    {                        case 0: SetText(url + "\t采集失败，网络错误,或数据库已存在该数据", false); break;                        case 1: SetText(url + "\t采集失败，字段不匹配", false); break;                        case 2: SetText(url + "\t采集成功", true); break;                    }                    Spide();                }                else                {                    label4.Text = "采集完成";                  }            }            catch (Exception ex)            {                MessageBox.Show(ex.ToString());            }        }                /// <summary>        /// 检查网络中是否存在文件        /// </summary>        /// <param name="issue"></param>        /// <returns></returns>        private bool RemoteFileExists(string url)        {            try            {                string urls = url;                HttpWebRequest re = (HttpWebRequest)WebRequest.Create(urls);                HttpWebResponse res = (HttpWebResponse)re.GetResponse();                re.Timeout = 5000;                if (res.ContentLength != 0)                {                    //MessageBox.Show("文件存在");                    return true;                }            }            catch (Exception)            {                //MessageBox.Show("无此文件");                return false;            }            return false;        }