Question

我想创建主机名到IP地址，反之亦然。但是我遇到一个问题，其中1个主机名返回2个IP地址，而当我将IP地址重新转换为主机名时，只有其中一个返回正确的主机名。

转换CEGN5CG7260FR7.xxxxx.xxx的示例将返回192.168.X.XX和10.132.XXX.XXX，但是当重新转换回主机名时，只有10.132.XXX.XXX返回正确的主机名。

此代码片段用于将主机名转换为IP地址：-

// Convert hostname to IP address
            IPHostEntry host = Dns.GetHostEntry(hostList[i]);
            IPAddress[] ipaddr = host.AddressList;
            // Loop through the IP Address array and add the IP address to IP List
            foreach (IPAddress addr in ipaddr)
            {
                if (addr.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                {
                     ipList.Add(addr.ToString());
                }
            }
            // Display items in IP Address textbox
            foreach (var ip in ipList)
            {
                ips += ip + Environment.NewLine;
            }
            txtIP.Text = ips;

此代码片段用于将IP地址转换为主机名：-

// Convert IP address to hostname
            IPHostEntry IP = Dns.GetHostEntry(IPAddress.Parse(ip));
            if (IP != null)
            {
                 hostList.Add(IP.HostName);
            }
            // Display items in Hostname textbox
            foreach (var hn in hostList)
            {
                hosts += hn + Environment.NewLine;
            }
            txtHost.Text = hosts;

我只能获得并显示10.132.XXX.XXX IP地址而忽略第一个IP地址，该怎么办？

Answer 1

您可以尝试使用此代码找到正确的IP地址。

 public static string GetLocalIPAddress()
    {
        var host = Dns.GetHostEntry(Dns.GetHostName());
        foreach (var ip in host.AddressList)
        {
            if (ip.AddressFamily == AddressFamily.InterNetwork)
            {
                return ip.ToString();
            }
        }
        throw new Exception("No network adapters with an IPv4 address in the system!");
    }

将主机名仅转换为一个IP地址

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