计算使用套接字发送文件的每秒速度和剩余时间tcp c＃

如何计算每秒的速度和以秒为单位的剩余时间？ 我试过用：

void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { long prevSum = 0; while (fileTransfer.busy) { rate = (fileTransfer.sum - prevSum); RateLabel(rate); //converting prevSum to (int)KB/SEC if (rate != 0) left = (fileTransfer.fileSize - fileTransfer.sum) / rate; TimeSpan t = TimeSpan.FromSeconds(left); timeLeftLabel(FormatRemainingText(rate, t)); //show how much left prevSum = fileTransfer.sum; Thread.Sleep(1000); } } 

但是剩下的速度和时间会持续上升和下降（30MB /秒，然后是5MB /秒）。

这是sendfile代码：

 public static void sendFile(string filePath) { // run the progres Form Thread thFP = new Thread(fpRUN); fileProgress fP = new fileProgress("Sending..."); thFP.Start(fP); FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); string fileName = Path.GetFileName(filePath); byte[] fileData; try { //sending file name and file size to the server busy = true; fileSize = fs.Length; byte[] fileDetial = null; string detail = fileName + "," + fileSize.ToString(); fileDetial = Encoding.ASCII.GetBytes(detail); client.Send(fileDetial); //sending file data to the server fileData = new byte[packetSize]; count = 0; sum = 0; fP.SizeLabel(fileSize); // tell the form the file size while (sum < fileSize) { fs.Seek(sum, SeekOrigin.Begin); fs.Read(fileData, 0, fileData.Length); count = client.Send(fileData, 0, fileData.Length, SocketFlags.None); sum += count; fP.ProgressBarFileHandler(sum,fileSize); //progressbar value fP.SentLabel(sum); //tell the form how much sent } } finally { busy = false; fs.Close(); fileData = null; MessageBox.Show(string.Format("{0} sent successfully", fileName)); } } 

我该如何解决这个问题？ 有更好的方法来计算速度吗？

Answer 1

您可以对传输速度进行一些平滑处理，以避免跳转该值。 有关一个选项，请参见http://en.wikipedia.org/wiki/Moving_average 。 基本上计算速度随时间变化的某种平均值。

Answer 2

你无法解决这个问题。 “修复”它的唯一方法是创建一个恒速网络/互联网。

网络（和您的计算机）没有恒定的速度。

计算会告诉你它是什么。

Answer 3

在表单构造函数中

 Timer timer1 = new Time(); public Form1() { InitializeComponent(); this.timer1.Enabled = true; this.timer1.Interval = 1000; this.timer1.Tick += new System.EventHandler(this.timer1_Tick); } 

或者从工具箱中添加它并设置以前的值

发送的字节总和应该是公共的，所以我们的方法可以每秒获得它的值

  long sentBytes = 0; //the sent bytes that updated from sending method long prevSentBytes = 0; //which references to the previous sentByte double totalSeconds = 0; //seconds counter to show total time .. it increases everytime the timer1 ticks. private void timer1_Tick(object sender, EventArgs e) { long speed = sentBytes - prevSentBytes ; //here's the Transfer-Rate or Speed prevSentBytes = sentBytes ; labelSpeed.Text = CnvrtUnit(speed) + "/S"; //display the speed like (100 kb/s) to a label if (speed > 0) //considering that the speed would be 0 sometimes.. we avoid dividing on 0 exception { totalSeconds++; //increasing total-time labelTime.Text = TimeToText(TimeSpan.FromSeconds((sizeAll - sumAll) / speed)); //displaying time-left in label labelTotalTime.Text = TimeToText(TimeSpan.FromSeconds(totalSeconds)); //displaying total-time in label } } private string TimeToText(TimeSpan t) { return string.Format("{2:D2}:{1:D2}:{0:D2}", t.Seconds, t.Minutes, t.Hours); } private string CnvrtUnit(long source) { const int byteConversion = 1024; double bytes = Convert.ToDouble(source); if (bytes >= Math.Pow(byteConversion, 3)) //GB Range { return string.Concat(Math.Round(bytes / Math.Pow(byteConversion, 3), 2), " GB"); } else if (bytes >= Math.Pow(byteConversion, 2)) //MB Range { return string.Concat(Math.Round(bytes / Math.Pow(byteConversion, 2), 2), " MB"); } else if (bytes >= byteConversion) //KB Range { return string.Concat(Math.Round(bytes / byteConversion, 2), " KB"); } else //Bytes { return string.Concat(bytes, " Bytes"); } }