背景听众 [英] Background listener

问题描述

我正在编写一个应用程序（控制台C＃）我希望它在后台运行并等待更改网络适配器。几乎像一项服务。最好的方法是什么？

I am writing an app (console C#) I want it to run in the back ground and wait for a change to the network adapter. Almost like a service. What would be the best way to do this?

推荐答案

我做了以下事情：

networkIsAvailable = IsNetworkAvailable(2000000);

NetworkChange.NetworkAvailabilityChanged +=
new NetworkAvailabilityChangedEventHandler(NetworkChange_NetworkAvailabilityChanged);

private void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
        {
            if (e.IsAvailable)
            {
                //MessageBox.Show("Available");
                SetTextVoorNetwerk("Aan", Color.GreenYellow, true);

            }
            else
            {
                //MessageBox.Show("Not available");
                SetTextVoorNetwerk("Uit", Color.Red, false);

                SoundPlayer verbinding = new SoundPlayer("verbinding.wav");
                verbinding.Play();
            }
        }

        /// <summary>
        /// Indicates whether any network connection is available.
        /// Filter connections below a specified speed, as well as virtual network cards.
        /// </summary>
        /// <param name="minimumSpeed">The minimum speed required. Passing 0 will not filter connection using speed.</param>
        /// <returns>
        ///     <c>true</c> if a network connection is available; otherwise, <c>false</c>.
        /// </returns>
        public static bool IsNetworkAvailable(long minimumSpeed)
        {
            if (!NetworkInterface.GetIsNetworkAvailable())
                return false;

            foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
            {
                // discard because of standard reasons
                if ((ni.OperationalStatus != OperationalStatus.Up) ||
                    (ni.NetworkInterfaceType == NetworkInterfaceType.Loopback) ||
                    (ni.NetworkInterfaceType == NetworkInterfaceType.Tunnel))
                    continue;

                // this allow to filter modems, serial, etc.
                // I use 10000000 as a minimum speed for most cases
                if (ni.Speed < minimumSpeed)
                    continue;

                // discard virtual cards (virtual box, virtual pc, etc.)
                if ((ni.Description.IndexOf("virtual", StringComparison.OrdinalIgnoreCase) >= 0) ||
                    (ni.Name.IndexOf("virtual", StringComparison.OrdinalIgnoreCase) >= 0))
                    continue;

                // discard "Microsoft Loopback Adapter", it will not show as NetworkInterfaceType.Loopback but as Ethernet Card.
                if (ni.Description.Equals("Microsoft Loopback Adapter", StringComparison.OrdinalIgnoreCase))
                    continue;

                return true;
            }
            return false;
        }

在这里你可以检查网络是否可用

Here you can check if network is avaible

希望能帮到你

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