如何计算网络速度？

Question

解决：

我正在使用WCF通过流传输文件。客户端调用服务中的方法，然后服务从客户端获取文件。在路上，我正以CallBack的速度发回。

我的问题是，我无法确定我计算的速度。当服务从客户端获取文件时，它使用下载速度。但是，当客户端发送文件时，它是上传速度。我需要计算哪一个，以及如何计算？

尚未解决：

当客户端调用服务的方法(并向它提供对文件的引用的流)时，从客户端调用方法到服务的方法开始激活为止，太长(取决于文件的大小)。这一切为什么要发生？一个千兆字节的文件要花很长时间。

*从服务的方法开始，所有的事情运作良好，没有任何问题。所以展示服务是浪费时间。

(客户)

Stream TheStream = File.OpenRead(@"C:\BigFile.rar");
Service1.GiveAFile(TheStream);

谢谢。

Answer 1

来源：如何在c#中计算网络带宽速度

CODE:
using System;
using System.Net.NetworkInformation;
using System.Windows.Forms;

namespace InterfaceTrafficWatch
{
    /// <summary>
    /// Network Interface Traffic Watch
    /// by Mohamed Mansour
    /// 
    /// Free to use under GPL open source license!
    /// </summary>
    public partial class MainForm : Form
    {
        /// <summary>
        /// Timer Update (every 1 sec)
        /// </summary>
        private const double timerUpdate = 1000;

        /// <summary>
        /// Interface Storage
        /// </summary>
        private NetworkInterface[] nicArr;

        /// <summary>
        /// Main Timer Object 
        /// (we could use something more efficient such 
        /// as interop calls to HighPerformanceTimers)
        /// </summary>
        private Timer timer;

        /// <summary>
        /// Constructor
        /// </summary>
        public MainForm()
        {
            InitializeComponent();
            InitializeNetworkInterface();
            InitializeTimer();
        }

        /// <summary>
        /// Initialize all network interfaces on this computer
        /// </summary>
        private void InitializeNetworkInterface()
        {
            // Grab all local interfaces to this computer
            nicArr = NetworkInterface.GetAllNetworkInterfaces();

            // Add each interface name to the combo box
            for (int i = 0; i < nicArr.Length; i++)
                cmbInterface.Items.Add(nicArr[i].Name);

            // Change the initial selection to the first interface
            cmbInterface.SelectedIndex = 0;
        }

        /// <summary>
        /// Initialize the Timer
        /// </summary>
        private void InitializeTimer()
        {
            timer = new Timer();
            timer.Interval = (int)timerUpdate;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
        }

        /// <summary>
        /// Update GUI components for the network interfaces
        /// </summary>
        private void UpdateNetworkInterface()
        {
            // Grab NetworkInterface object that describes the current interface
            NetworkInterface nic = nicArr[cmbInterface.SelectedIndex];

            // Grab the stats for that interface
            IPv4InterfaceStatistics interfaceStats = nic.GetIPv4Statistics();

            // Calculate the speed of bytes going in and out
            // NOTE: we could use something faster and more reliable than Windows Forms Tiemr
            //       such as HighPerformanceTimer http://www.m0interactive.com/archives/2006/12/21/high_resolution_timer_in_net_2_0.html
            int bytesSentSpeed = (int)(interfaceStats.BytesSent - double.Parse(lblBytesSent.Text)) / 1024;
            int bytesReceivedSpeed = (int)(interfaceStats.BytesReceived - double.Parse(lblBytesReceived.Text)) / 1024;

            // Update the labels
            lblSpeed.Text = nic.Speed.ToString();
            lblInterfaceType.Text = nic.NetworkInterfaceType.ToString();
            lblSpeed.Text = nic.Speed.ToString();
            lblBytesReceived.Text = interfaceStats.BytesReceived.ToString();
            lblBytesSent.Text = interfaceStats.BytesSent.ToString();
            lblUpload.Text = bytesSentSpeed.ToString() + " KB/s";
            lblDownload.Text = bytesReceivedSpeed.ToString() + " KB/s";

        }

        /// <summary>
        /// The Timer event for each Tick (second) to update the UI
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void timer_Tick(object sender, EventArgs e)
        {
            UpdateNetworkInterface();
        }

    }
}

Answer 2

关于第二个问题：

很可能您的服务是将整个文件加载到内存中，然后再流回客户端。

您可以查看以下问题，以了解如何正确地对其进行分组。

如何在不将整个文件加载到内存的情况下读取/流文件？