在C#中如何编程可以检测一个端口的流量

你在currentSpeed = reeciveSpan * 1000 / span.Milliseconds / 1024;这句加个判断就行了

把currentSpeed = reeciveSpan * 1000 / span.Milliseconds / 1024;改为

if (span.Milliseconds != 0)

{

    currentSpeed = reeciveSpan * 1000 / span.Milliseconds / 1024;

}

else

{

    currentSpeed = 0;

} 

这么写就行了，用进度条的话把最大值和最小值设为100和0,Value = e.ProgressPercentage 就行了

        private void button1_Click(object sender, EventArgs e)

        {

            webClint = new WebClient();

            start = DateTime.Now;

            lastTime = DateTime.Now;

            webClint.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClint_DownloadProgressChanged);

            webClint.DownloadFileAsync(new Uri("http://www.highstreet5.com.sg/music/firefly.mp3"), "e:\\Fire Fly.mp3");

        }

        WebClient webClint;

        float maxSpeed = 0;

        float currentSpeed = 0;

        float lastSpeed = 0;

        long lastReceive = 0;

        long reeciveSpan;

        TimeSpan span;

        DateTime start;

        DateTime lastTime;

        TimeSpan useTime;

        void webClint_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)

        {

            span = DateTime.Now - lastTime;

            lastTime = DateTime.Now;

            useTime = lastTime - start;

            reeciveSpan = e.BytesReceived - lastReceive;

            currentSpeed = reeciveSpan * 1000 / span.Milliseconds / 1024;

            maxSpeed = currentSpeed > maxSpeed ? currentSpeed : maxSpeed;

            lastSpeed = currentSpeed;

            lastReceive = e.BytesReceived;

            label1.Text = "已下载: " + e.BytesReceived / 1024 + "KB\n" +

                "总大小: " + e.TotalBytesToReceive / 1024 + "KB\n" +

                "百分比: " + e.ProgressPercentage + "%\n" +

                "当前速度: " + currentSpeed.ToString("F2") + "KB/s\n" +

                "最大速度: " + maxSpeed.ToString("F2") + "KB/s\n" +

                "用时: " + (useTime.Minutes * 60 + useTime.Seconds) + "s";

            if (e.BytesReceived == e.TotalBytesToReceive)

            {

                webClint.DownloadProgressChanged -= webClint_DownloadProgressChanged;

                webClint.Dispose();

                MessageBox.Show("任务完成!");

            }

        }

本文如未解决您的问题请添加抖音号：51dongshi（抖音搜索懂视），直接咨询即可。