获取网络带宽信息

Question

我使用计时器来获取每秒的带宽，并将这些信息放在标签上，输出值很大，比如419000KB/S，下一个选项可能是0KB/S。这是一个与线程有关的问题吗？我想是bytes不能正确地更新，但我不知道要修复它。

    public partial class MainWindow : Window
    {
        static long bytes = 0;
        static NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
        static Label uploadLabel;
        public MainWindow()
        {
            InitializeComponent();
            uploadLabel = uploadBandwidth;
            IPv4InterfaceStatistics statistics = adapters[0].GetIPv4Statistics();

            bytes = statistics.BytesSent;
            Timer myTimer = new Timer();
            myTimer.Elapsed += new ElapsedEventHandler(TimeUp);
            myTimer.Interval = 1000;
            myTimer.Start();
        }

        public void TimeUp(object source, ElapsedEventArgs e)
        {
            IPv4InterfaceStatistics statistics = adapters[0].GetIPv4Statistics();
            bytes = statistics.BytesSent - bytes;
            Dispatcher.Invoke(DispatcherPriority.Normal, new Action<Label>(SetValue), uploadLabel);
        }

        private void SetValue(Label upload)
        {
            upload.Content = ((int)bytes / 1024).ToString() + "KB/s";
        }
    }

更新：

问题是我将值bytes更改为statistics.BytesSent - bytes，这是错误的。下面是我修改的函数：

public void TimeUp(object source, ElapsedEventArgs e)
{
    IPv4InterfaceStatistics statistics = NetworkInterface.GetAllNetworkInterfaces()[0].GetIPv4Statistics();
    long bytesPerSec = statistics.BytesReceived - bytes;
    bytes = statistics.BytesReceived;
    String speed = (bytesPerSec / 1024).ToString() + "KB/S";
    Dispatcher.Invoke(DispatcherPriority.Normal, new Action<Label, String>(SetValue), uploadLabel, speed);
}

private void SetValue(Label upload, String speed)
{
    upload.Content = speed;
}

Answer 1

你的逻辑有问题。

开始时，您将迄今发送的数据存储在bytes中

uploadLabel = uploadBandwidth;
IPv4InterfaceStatistics statistics = adapters[0].GetIPv4Statistics();

bytes = statistics.BytesSent; // initialize bytes to amount already sent

然后，在每个事件上，重置包含BytesSent - bytes的值。

IPv4InterfaceStatistics statistics = adapters[0].GetIPv4Statistics();
bytes = statistics.BytesSent - bytes;

因此，假设您从每秒钟发送15k并发送1kB开始，变量如下：

|| seconds elapsed | BytesSent | bytes ||
||=================|===========|=======||
||        0        |   15000   | 15000 ||
||        1        |   16000   |  1000 ||
||        2        |   17000   | 16000 ||
||        3        |   18000   |  2000 ||

因此，正如您所看到的，bytes值是交替的，在任何情况下都不显示任何合法值，只有第一种情况除外。

为了解决您的问题，您需要引入第二个状态变量，或者以与@Sign类似的正确方式将字节值传递给SetValue方法：

public void TimeUp(object source, ElapsedEventArgs e)
{
    IPv4InterfaceStatistics statistics = adapters[0].GetIPv4Statistics();
    var sent = statistics.BytesSent - bytes;
    Dispatcher.Invoke(DispatcherPriority.Normal, new Action<Label>(SetValue), uploadLabel, sent);
    bytes = statistics.BytesSent;
}