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所以本质上我有一个下载文件的表格，称为file.jpg，例如每隔一小时左右旋转一次，我有一个按钮可以开始下载，它会随机下载任意时间（主要是自学练习）我喜欢在progressChange中添加代码，我想以某种方式获取随着时间的推移接收到的字节以获得kb/s。我用谷歌搜索，找不到任何东西。我不需要任何花哨的网络堆栈，因为它们是标准的 jpeg，所以它不是太大（事实上，当文件下载时，当我清除进度条时，我从来没有看到它开始......但我离题了）我喜欢看到平均 kb/s，即使我看到它 2 秒（每个文件大约 1 meg）。任何帮助深表感谢。

private void btnStart_Click(object sender, EventArgs e)
    {
        btnStart.Enabled = false;
        btnStop.Enabled = true;



        WebClient webclient = new WebClient();           
        webclient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
        webclient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);            
        // you need to increment the number !!! 

        // add the file to the list.
        // single click should preview
        // progress bar should clear after it downloads
        // the status bar as well should be done

        int num = nextIndex() + 1;
        string file = @"C:\IMG\IMG_";
        file += string.Format("{0:d5}", num);
        file += ".jpg";

        webclient.DownloadFileAsync(new Uri("http://www.foobar.com/file.jpg"), file);
        lstFiles.Enabled = false;           
    }

 private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        // display kb/sec as well??
        pbDownload.Value = e.ProgressPercentage;

    }
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1 回答 1

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private void downloadMyWorkProgress(object sender, DownloadProgressChangedEventArgs e)
{
    double bytesIn = double.Parse(e.BytesReceived.ToString());
    double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
    double percentage = bytesIn / totalBytes * 100;
    progressBar1.Value = int.Parse(Math.Truncate(percentage).ToString());
}
于 2013-09-24T10:28:26.540 回答