webClient下载进度条

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Net;



namespace DownlaodFile

{

public partial class Form1 : Form

{

System.Net.WebClient c ;

public Form1()

{

InitializeComponent();

c = new System.Net.WebClient();

c.DownloadProgressChanged += new System.Net.DownloadProgressChangedEventHandler(c_DownloadProgressChanged);

c.DownloadFileCompleted += new AsyncCompletedEventHandler(c_DownloadFileCompleted);

c.Proxy=WebRequest.DefaultWebProxy;

c.Proxy.Credentials = new NetworkCredential("admin", "admin_password", "domain");

}



void c_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)

{

MessageBox.Show("ok");

}



private void btnDownload_Click(object sender, EventArgs e)

{

c.DownloadFileAsync(new Uri(txtUrl.Text), @"d:"t.dat");

}



void c_DownloadProgressChanged(object sender, System.Net.DownloadProgressChangedEventArgs e)

{

progressBar1.Value = e.ProgressPercentage;

}



private void btnQuit_Click(object sender, EventArgs e)

{

if (c!=null)

{

c.CancelAsync();

}

Close();

}

}

}