WPF 下载网络文件 带进度条

 

附件：http://files.cnblogs.com/xe2011/WpfApplication3_downloadFile.rar

---

使用

        private void Button_Click_1(object sender, RoutedEventArgs e)

        {

            string url = "http://files.cnblogs.com/xe2011/WpfApplication1_webbrowser_transparent.rar";

            bool b =DownloadFile(url, @"D:\Administrator\Desktop\123.7z", progressBar1, label1);

            if (b)

                MessageBox.Show("下载成功");

            else

                MessageBox.Show("下载失败");

}

 

---

        public bool DownloadFile(string URL, string fileName, System.Windows.Controls.ProgressBar progressBar1)

        {

            try

            {

                System.Net.HttpWebRequest httpWebRequest1 = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL);

                System.Net.HttpWebResponse httpWebResponse1 = (System.Net.HttpWebResponse)httpWebRequest1.GetResponse();

 

                long totalLength = httpWebResponse1.ContentLength;

                if (progressBar1 != null)

                {

                    progressBar1.Maximum = (int)totalLength;

                }

                System.IO.Stream stream1 = httpWebResponse1.GetResponseStream();

                System.IO.Stream stream2 = new System.IO.FileStream(fileName, System.IO.FileMode.Create);

                

                long currentLength = 0;

                byte[] by = new byte[1024];

                int osize = stream1.Read(by, 0, (int)by.Length);

                while (osize > 0)

                {

                    WpfApplication.DispatcherHelper.DoEvents();

                    

                    currentLength = osize + currentLength;

                    stream2.Write(by, 0, osize);

                    if (progressBar1 != null)

                    {

                        progressBar1.Value = (int)currentLength;

                        label1.Content = String.Format("{0} / {1}", BytesToString(currentLength), BytesToString(totalLength));

                    }

                    osize = stream1.Read(by, 0, (int)by.Length);

                }

                

                stream2.Close();

                stream1.Close();

 

                return (currentLength == totalLength); 

            }

            catch 

            {

                return false;

            }

        }

来自为知笔记(Wiz)

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