public partial class MultiThread : Form    {          public int threadh;//线程代号　        public string strUrl;//接收文件的URL　        public FileStream fs;        public HttpWebRequest request;        public byte[] nbytes;//接收缓冲区　        public int nreadsize;//接收字节数　         int conts;        int Conted;        public MultiThread()        {            //不对错误线程进行调用            System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;            InitializeComponent();        }        //ThreadStart start        private void butquantity_Click(object sender, EventArgs e)        {            if (txtquantity.Text != "")            {                conts = Convert.ToInt32(txtquantity.Text);                 Thread[] threads = new Thread[conts];                for (int i = 0; i < conts; i++)                {                    threads[i] = new Thread(new ThreadStart(ReadHttp));                    threads[i].Name = i.ToString() + "线程号";                }                 foreach (Thread t in threads)                {                    t.Start();                    //textBox2.Text = Thread.CurrentThread.Name;                }                InitializeTimer();            }            else            {                MessageBox.Show("请求数量不能为空！", "ERROR");            }        }         private void timerClock_Elapsed(object source, ElapsedEventArgs e)        {            if (txtquantity.Text != "")            {                conts = Convert.ToInt32(txtquantity.Text);                 Thread[] threads = new Thread[conts];                for (int i = 0; i < conts; i++)                {                    threads[i] = new Thread(new ThreadStart(ReadHttp));                     threads[i].Name = i.ToString() + "线程号";                }                foreach (Thread t in threads)                {                    t.Start();                }            }            else            {                MessageBox.Show("请求数量不能为空！", "ERROR");            }        }         //发送请求        private void ReadHttp()        {            try            {                Conted = Convert.ToInt32(txtquantity.Text);                System.Net.WebClient client = new System.Net.WebClient();                strUrl = txtAddress.Text;                //this.textBox2.Text = "正在请求" + strUrl;                Stream st = client.OpenRead(strUrl);                StreamReader sr = new StreamReader(st);                string res = sr.ReadToEnd();                if (res != null)                {                    listBox1.Items.Add("-->" + Thread.CurrentThread.Name + "成功");                }                else                {                    listBox1.Items.Add("-->" + Thread.CurrentThread.Name + "失败");                }                sr.Close();                st.Close();                Thread.Sleep(2000);            }            catch (Exception e)            {                MessageBox.Show(e.Message, "提示：");                //throw;            }        }        public void InitializeTimer()        {            System.Timers.Timer timerClock = new System.Timers.Timer();            timerClock.Elapsed += new ElapsedEventHandler(timerClock_Elapsed);            //timerClock.Interval = 1000 * 60 * 3;            timerClock.Interval = 3000;            timerClock.Enabled = true;          }     }}

C# 多线程并发