Httpclient获取下载速度

Question

有人可以帮我一下吗？我正在下载文件，我能够获得实际的下载速度。但如果速度大于 1mbps

，我想将 UNIT 从 KB/sec 更改为 MB/sec

我怎么知道它是否大于 1mbps 以便我的 UNIT 也会改变

这是我当前的代码。

我运行这是一个循环。

for (int i = 0; i < totalCount; i++)
     {
     
    string downloadUrl= LB.Items[i].toString();
    
    
    double currentSize = TotalFileSize; //882672
    string UNIT = "KB/s";
    
    DateTime startTime = DateTime.Now;
     

    await ProgressUpdate(downloadUrl, cts.Token); //the actual download
    
    DateTime endTime = DateTime.Now;
    double t = Math.Round(currentSize / 1024 / (endTime - startTime).TotalSeconds);
    var downloadSpeed = (string.Format("Download Speed: {0}{1}", t, UNIT));

谢谢。

Answer 1

你可以使用一个小助手，例如：

var downloadSpeed = FormatSpeed(TotalFileSize, (endTime - startTime).TotalSeconds);

string FormatSpeed( double size, double tspan )
{
      string message = "Download Speed: {0:N0} {1}";
      if( size/tspan > 1024 * 1024 ) // MB
      {
          return string.Format(message, size/(1024*1204)/tspan, "MB/s");
      }else if( size/tspan > 1024 ) // KB
      {
          return string.Format(message, size/(1024)/tspan, "KB/s");
      }
      else
      {
          return string.Format(message, size/tspan, "B/s");
      }
}

看到了运行：https://dotnetfiddle.net/MjUW2M

输出：

Download Speed: 10 B/s
Download Speed: 100 B/s
Download Speed: 200 B/s
Download Speed: 100 KB/s
Download Speed: 83 MB/s
Download Speed: 9 MB/s

或略有不同：https://dotnetfiddle.net/aqanaT

string FormatSpeed( double size, double tspan )
{
  string message = "Download Speed: ";
  if( size/tspan > 1024 * 1024 ) // MB
  {
      return string.Format(message + "{0:N1} {1}", size/(1024*1204)/tspan, "MB/s");
  }else if( size/tspan > 1024 ) // KB
  {
      return string.Format(message + "{0:N0} {1}", size/1024/tspan, "KB/s");
  }
  else
  {
      return string.Format(message + "{0:N1} {1}", size/1024/tspan, "KB/s");
  }

输出：

Download Speed: 0.0 KB/s
Download Speed: 0.1 KB/s
Download Speed: 0.2 KB/s
Download Speed: 100 KB/s
Download Speed: 83.1 MB/s
Download Speed: 8.5 MB/s

Httpclient获取下载速度

Httpclient getting the download speed

c#

httpclient