Dns.GetHostAddress(hostname) No such device or address Ubuntu 16.04 中的异常答案

【问题标题】：Dns.GetHostAddress(hostname) No such device or address Exception in Ubuntu 16.04Dns.GetHostAddress(hostname) No such device or address Ubuntu 16.04 中的异常
【发布时间】：2018-10-26 04:16:37
【问题描述】：

我有一个 .net core 2.0 项目，它试图从 linux 机器上获取主机名和主机 IP 地址。该程序在 Mac OS 和 Windows 上运行良好，但在 linux - Ubuntu 16.04 上运行不佳

public class Program
{
    public static void Main(string[] args)
    {
        var HostName = Dns.GetHostName();
        Console.WriteLine("Host name : " + HostName);
        var HostAddress = GetHostAddress(HostName);
        Console.WriteLine("Host address : " + HostAddress);
    }

    private static string GetHostAddress(string hostName)
    {
        try
        {
            var addressList = Dns.GetHostAddresses(hostName);

            foreach (IPAddress address in addressList)
            {
                Console.WriteLine("IP Address : " + address.ToString());
                if (address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                {
                    string ip = address.ToString();
                    if (!ip.StartsWith("127."))
                        return ip;
                }
            }

            return "127.0.0.1";
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
            throw;
        }
        
    }
}

我得到的例外是

ubuntu@ip-10-40-121-185:~/home/IP$ dotnet IP.dll

主机名：ip-10-40-121-185

System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (0x00000005)：没有这样的设备或地址

在 System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)

在 System.Net.Dns.GetHostAddresses(String hostNameOrAddress)

在/Users/jliu/RiderProjects/IpTest/IP/Program.cs:line 34 中的 IP.Program.GetHostAddress(String hostName)

未处理的异常： System.Net.Internals.SocketExceptionFactory+ExtendedSocketException：没有这样的设备或地址

在 System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)

在 System.Net.Dns.GetHostAddresses(String hostNameOrAddress)

在/Users/jliu/RiderProjects/IpTest/IP/Program.cs:line 52 中的 IP.Program.GetHostAddress(String hostName)

在/Users/jliu/RiderProjects/IpTest/IP/Program.cs:line 20 中的 IP.Program.Main(String[] args) 中止（核心转储）

知道如何修复它或在 linux 机器上获取 IP 的任何替代方法吗？谢谢。

【问题讨论】：

标签： c# linux ubuntu dns .net-core

【解决方案1】：

从另一个对我有用的线程Get local IP address 获得答案

感谢@Gerardo H https://stackoverflow.com/a/28621250/4861127 提供的解决方案

    internal static string GetLocalIPv4(NetworkInterfaceType _type)
    {
        string output = "";
        foreach (NetworkInterface item in NetworkInterface.GetAllNetworkInterfaces())
        {
            if (item.NetworkInterfaceType == _type && item.OperationalStatus == OperationalStatus.Up)
            {
                IPInterfaceProperties adapterProperties = item.GetIPProperties();

                if (adapterProperties.GatewayAddresses.FirstOrDefault() != null)
                {
                    foreach (UnicastIPAddressInformation ip in adapterProperties.UnicastAddresses)
                    {
                        if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                        {
                            output = ip.Address.ToString();
                        }
                    }
                }
            }
        }

        return output;
    }

【讨论】：