線程池及線程帶參數

 

後臺代碼:

 

private void button1_Click(object sender, EventArgs e)
{
ParameterizedThreadStart start = new ParameterizedThreadStart(DownLoadHtml);
Thread thread = new Thread(start);
thread.Start();
}

private void DownLoadHtml(object obj)
{
for (int i = 30000; i < 30010; i++)
{
using (WebClient client = new WebClient())
{
try
{
client.DownloadFile(@"http://job.cnblogs.com/offer/" + i + "/", @"E:\html\" + i + ".html");
this.Invoke(new Action(delegate() {
this.textBox1.AppendText("第"+i+"個帖子下載完成!\n");
}));
}
catch (Exception)
{


}
}
}
Action action = new Action(msg);
this.Invoke(action);
}

private void msg()
{ MessageBox.Show("下載完成!"); }

private void button2_Click(object sender, EventArgs e)
{
ParameterizedThreadStart start = new ParameterizedThreadStart(mianji);
Thread thread = new Thread(start);
thread.Start(5);
}

private void mianji(object r)
{
double result = Math.PI * Convert.ToDouble(r) * Convert.ToDouble(r);
MessageBox.Show(result.ToString());
}

private void button3_Click(object sender, EventArgs e)
{
WaitCallback wait = new WaitCallback(DownLoadHtml);
ThreadPool.QueueUserWorkItem(wait);
}

private void button4_Click(object sender, EventArgs e)
{
for (int i = 30000; i < 30020; i++)
{
WaitCallback wait = new WaitCallback(DownLoadHtml1);
ThreadPool.QueueUserWorkItem(wait,i);
}
//this.Invoke(new Action(delegate()
//{
// MessageBox.Show("下載完成!");
//}));
}

private void DownLoadHtml1(object i)
{
try
{
WebClient client = new WebClient();
client.DownloadFile(@"http://job.cnblogs.com/offer/" + i + "/", @"E:\html\" + i + ".html");
this.Invoke(new Action(delegate()
{
this.textBox1.AppendText("第" + i + "個帖子下載完成!\n");
}));

}
catch (Exception)
{


}
}