c#:从DnsGetHostEntry（）获取IPv4地址

您是否查看了退货中的所有地址，丢弃了InterNetworkV6系列的地址，仅保留了IPv4地址？

要查找所有本地IPv4地址：

IPAddress[] ipv4Addresses = Array.FindAll(
    Dns.GetHostEntry(string.Empty).AddressList,
    a => a.AddressFamily == AddressFamily.InterNetwork);

或使用 Array.Find 或 Array.FindLast 如果您只想要一个。

IPHostEntry ipHostInfo = Dns.GetHostEntry(serverName);
IPAddress ipAddress = ipHostInfo.AddressList
    .FirstOrDefault(a => a.AddressFamily == AddressFamily.InterNetwork);

   public Form1()
    {
        InitializeComponent();
        string myHost = System.Net.Dns.GetHostName();
        string myIP = null;
        for (int i = 0; i <= System.Net.Dns.GetHostEntry(myHost).AddressList.Length - 1; i++)
        {
            if (System.Net.Dns.GetHostEntry(myHost).AddressList[i].IsIPv6LinkLocal == false)
            {
                myIP = System.Net.Dns.GetHostEntry(myHost).AddressList[i].ToString();
            }
        }
    }

在公共变量中声明myIP和myHost 并以任何形式使用该函数。

   public static string GetIPAddress(string hostname)
    {
        IPHostEntry host;
        host = Dns.GetHostEntry(hostname);
        foreach (IPAddress ip in host.AddressList)
        {
            if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
            {
                //System.Diagnostics.Debug.WriteLine("LocalIPadress: " + ip);
                return ip.ToString();
            }
        }
        return string.Empty;
    }