在C#中下载多个文件(一次只能下载一个/队列)

本文关键字：下载 一个 队列 一次 文件 | 更新日期: 2023-09-27 18:21:59

我正在用C#编写一个更新程序，现在我需要一些帮助（我是这门语言的新手，请解释你的提示：D）

我的代码：

System.IO.Directory.CreateDirectory("tmp");
            int mmx = updnec.Count();
            label6.Text = "0/" + mmx;
            MessageBox.Show(label6.Text);
            int mmn = 0;
            foreach (string lz in link)
            {
                    MessageBox.Show(lz);
                    client.DownloadFileAsync(new Uri(lz), "tmp/update00" + mmn + ".exe");
                    client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
                    label6.Text = mmn + "/" + mmx;
                    mmn = +1;
                    //Whithout that while{} - part, it tries to download all links from the list at once. But I don't want the program to do that. I don't want it to show a message all the time, too, but when i leave that while{} - part empty, the program just freezes and doesn't even download. 
while (progressBar1.Maximum != progressBar1.Value)
                        {
                        MessageBox.Show("Test");
                    }
            }

        }
        void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            progressBar1.Maximum = (int)e.TotalBytesToReceive;
            progressBar1.Value = (int)e.BytesReceived;
            string sysload = progressBar1.Value /1000000 + "/" + progressBar1.Maximum /1000000 + " MB geladen";
            label12.Text = sysload;
        }

请阅读我代码中的注释。

如何解决我的问题！？请帮帮我！

Reditec

编辑：

label11.Text = System.DateTime.Now.ToString();
            backgroundWorker1.RunWorkerAsync(link);

        }
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            List<string> lz = (List<string>)e.Argument; 

            int mmn = 0;    
            progressBar1.Style = ProgressBarStyle.Blocks;
            System.IO.Directory.CreateDirectory("tmp");
            int mmx = 10;
            label6.Text = "0/" + mmx;
            foreach (string lkz in lz)
                using (var client = new WebClient())
            {
                MessageBox.Show("Hallo" + lkz);
                client.DownloadFile(lkz, "tmp/update00" + mmn + ".exe");
            } 

        }

在C#中下载多个文件(一次只能下载一个/队列)

尝试使用BackgroundWorker并同步下载文件，而不是异步下载。你可以在这里找到一个例子：http://www.codeproject.com/Tips/83317/BackgroundWorker-and-ProgressBar-demo

这里有一个例子：

void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{ 
   var links = new[] { "link1", "link2" }; 
   var percentProgressStep = (100 / links.Length) + 1
   using (var client = new WebClient()) 
   foreach (string l in links) 
     {
       client.DownloadFile(l, Path.GetTempFileName());
       backgroundWorker1.ReportProgress(percentProgressStep);
     } 
}
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