获取本地IP

public string GetLocalIP()
        {
            try
            {
                // 无法处理存在VMware虚拟机的情况
                //string HostName = Dns.GetHostName(); //得到主机名
                //IPHostEntry IpEntry = Dns.GetHostEntry(HostName);
                //for (int i = 0; i < IpEntry.AddressList.Length; i++)
                //{
                //    //从IP地址列表中筛选出IPv4类型的IP地址
                //    //AddressFamily.InterNetwork表示此IP为IPv4,
                //    //AddressFamily.InterNetworkV6表示此地址为IPv6类型
                //    if (IpEntry.AddressList[i].AddressFamily == AddressFamily.InterNetwork)
                //    {
                //        return IpEntry.AddressList[i].ToString();
                //    }
                //}

                // Get a list of all network interfaces (usually one per network card, dialup, and VPN connection) 
                NetworkInterface[] networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
                StringBuilder sb = new StringBuilder();
                foreach (NetworkInterface network in networkInterfaces)
                {
                    // 排除掉不可用的网络接口
                    if (network.OperationalStatus != OperationalStatus.Up)
                        continue;

                    // Read the IP configuration for each network 
                    IPInterfaceProperties properties = network.GetIPProperties();

                    // 排除掉没有网关的地址（VMware）
                    var gatewayAddr = properties.GatewayAddresses.FirstOrDefault();
                    if (gatewayAddr == null || gatewayAddr.Address.ToString().Equals("0.0.0.0"))
                        continue;

                    // Each network interface may have multiple IP addresses 
                    foreach (IPAddressInformation address in properties.UnicastAddresses)
                    {
                        // We're only interested in IPv4 addresses for now 
                        if (address.Address.AddressFamily != AddressFamily.InterNetwork)
                            continue;

                        // Ignore loopback addresses (e.g., 127.0.0.1) 
                        if (IPAddress.IsLoopback(address.Address))
                            continue;

                        return address.Address.ToString();
                    }
                }
                return "";
            }
            catch (Exception)
            {
                return "";
            }
        }

获取一个接口上有多个地址的代码

public static string[] GetAllLocalIPv4(NetworkInterfaceType _type)
{
    List<string> ipAddrList = new List<string>();
    foreach (NetworkInterface item in NetworkInterface.GetAllNetworkInterfaces())
    {
        if (item.NetworkInterfaceType == _type && item.OperationalStatus == OperationalStatus.Up)
        {
            foreach (UnicastIPAddressInformation ip in item.GetIPProperties().UnicastAddresses)
            {
                if (ip.Address.AddressFamily == AddressFamily.InterNetwork)
                {
                    ipAddrList.Add(ip.Address.ToString());
                }
            }
        }
    }
    return ipAddrList.ToArray();
}