C# 获取本机所有IP、默认网关、子网掩码

对几个IP地址集合的定义：

privateList<IPAddress>_localAddressFamily = new List<IPAddress>();//本机IP地址集合

privateList<IPAddress>_subNetAddressFamily = new List<IPAddress>();//子网掩码集合

privateList<IPAddress>_defaultIPGateway = new List<IPAddress>();// 默认网关集合

privateList<IPAddress> _broadcastFamily= new List<IPAddress>();//广播地址

比较简单的方式是借助C#已封装好的类来进行操作：

this._hostName = Dns.GetHostName();

IPHostEntry ipHostEntry=Dns.GetHostByName(this._hostName);

this._localAddressFamily.AddRange(ipHostEntry.AddressList);

// 至此 ipHostEntry.AddressList就是IP地址的集合

NetworkInterface[] adapters=NetworkInterface.GetAllNetworkInterfaces();

// 至此 adapters保存了本机所有的网卡适配器信息

NetworkInterface属性如下：

foreach (NetworkInterface ni in adapters) {

IPInterfaceProperties ipProperties =ni.GetIPProperties();

UnicastIPAddressInformation curIP =ipProperties.UnicastAddresses[0];

this._localAddressFamily.Add(curIP.Address);// 添加IP地址

this._subNetAddressFamily.Add(curIP.IPv4Mask);// 添加子网掩码

this._defaultIPGateway.Add(ipProperties.GatewayAddresses[0].Address);//添加默认网关

}

//============================我 是 分 割 线 =============================================

另外，还可以通过WMI来获得需要的信息

ManagementClass mc = newManagementClass("Win32_NetworkAdapterConfiguration");

ManagementObjectCollection nics =mc.GetInstances();

foreach (ManagementObject nic in nics) {

    if(Convert.ToBoolean(nic["ipEnabled"]) == true) {

       Array ips = nic["IPAddress"] as String[];

       Array subnets = nic["IPSubnet"] as String[];

        Array gateways =nic["DefaultIPGateway"] as String[];

       IPAddress curIP, curSubnet, curGateway;

       if (ips != null && ips.Length > 0) {

           curIP = IPAddress.Parse(ips.GetValue(ips.Length - 1));

           this._localAddressFamily.Add(curIP);

       }

       if (subnets != null && subnets.Length > 0) {

           curSubnet = IPAddress.Parse(subnets.GetValue(0));

           this._subNetAddressFamily.Add(curSubnet);

       }

       if (gateways != null && gateways.Length > 0) {

            curGateway =IPAddress.Parse(gateways.GetValue(0));

           this._defaultIPGateway.Add(curGateway);

       }

       if (curIP != null && curSubnet != null) {

           byte[] IPAddressByte = curIP.GetAddressBytes();

           byte[] IPSubnetByte = curSubnet.GetAddressBytes();

           StringBuilder broadcast = new StringBuilder();

           for (int i = 0; i < 4; i++) {

               broadcast.Append(IPAddressByte[i] | (~IPSubnetByte[i] & 255));

               if (i != 3) {

                   broadcast.Append(".");

                }

           }

           this._broadcastFamily.Add(IPAddress.Parse(broadcast.ToString()));

       }

    }

}