我正在运行一个服务器，我想显示我自己的IP地址。
获取计算机自身(如果可能的话，外部)IP地址的语法是什么?
有人编写了以下代码。
IPHostEntry host;
string localIP = "?";
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily.ToString() == "InterNetwork")
{
localIP = ip.ToString();
}
}
return localIP;
然而，我通常不信任作者，我不理解这段代码。有更好的方法吗?
当前回答
试试这个:
IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());
String MyIp = localIPs[0].ToString();
其他回答
我只是想添加我自己的一行代码(尽管已经有许多其他有用的答案)。
string ipAddress = new WebClient().DownloadString("http://icanhazip.com");
这对我很有用……并且在大多数情况下(如果不是全部)应该比查询DNS服务器更快。多亏了《狡猾博士的学徒》。
// ************************************************************************
/// <summary>
/// Will search for the an active NetworkInterafce that has a Gateway, otherwise
/// it will fallback to try from the DNS which is not safe.
/// </summary>
/// <returns></returns>
public static NetworkInterface GetMainNetworkInterface()
{
List<NetworkInterface> candidates = new List<NetworkInterface>();
if (NetworkInterface.GetIsNetworkAvailable())
{
NetworkInterface[] NetworkInterfaces =
NetworkInterface.GetAllNetworkInterfaces();
foreach (
NetworkInterface ni in NetworkInterfaces)
{
if (ni.OperationalStatus == OperationalStatus.Up)
candidates.Add(ni);
}
}
if (candidates.Count == 1)
{
return candidates[0];
}
// Accoring to our tech, the main NetworkInterface should have a Gateway
// and it should be the ony one with a gateway.
if (candidates.Count > 1)
{
for (int n = candidates.Count - 1; n >= 0; n--)
{
if (candidates[n].GetIPProperties().GatewayAddresses.Count == 0)
{
candidates.RemoveAt(n);
}
}
if (candidates.Count == 1)
{
return candidates[0];
}
}
// Fallback to try by getting my ipAdress from the dns
IPAddress myMainIpAdress = null;
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork) // Get the first IpV4
{
myMainIpAdress = ip;
break;
}
}
if (myMainIpAdress != null)
{
NetworkInterface[] NetworkInterfaces =
NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface ni in NetworkInterfaces)
{
if (ni.OperationalStatus == OperationalStatus.Up)
{
IPInterfaceProperties props = ni.GetIPProperties();
foreach (UnicastIPAddressInformation ai in props.UnicastAddresses)
{
if (ai.Address.Equals(myMainIpAdress))
{
return ni;
}
}
}
}
}
return null;
}
// ******************************************************************
/// <summary>
/// AddressFamily.InterNetwork = IPv4
/// Thanks to Dr. Wilys Apprentice at
/// http://stackoverflow.com/questions/1069103/how-to-get-the-ip-address-of-the-server-on-which-my-c-sharp-application-is-runni
/// using System.Net.NetworkInformation;
/// </summary>
/// <param name="mac"></param>
/// <param name="addressFamily">AddressFamily.InterNetwork = IPv4, AddressFamily.InterNetworkV6 = IPv6</param>
/// <returns></returns>
public static IPAddress GetIpFromMac(PhysicalAddress mac, AddressFamily addressFamily = AddressFamily.InterNetwork)
{
NetworkInterface[] NetworkInterfaces =
NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface ni in NetworkInterfaces)
{
if (ni.GetPhysicalAddress().Equals(mac))
{
if (ni.OperationalStatus == OperationalStatus.Up)
{
IPInterfaceProperties props = ni.GetIPProperties();
foreach (UnicastIPAddressInformation ai in props.UnicastAddresses)
{
if (ai.DuplicateAddressDetectionState == DuplicateAddressDetectionState.Preferred)
{
if (ai.Address.AddressFamily == addressFamily)
{
return ai.Address;
}
}
}
}
}
}
return null;
}
// ******************************************************************
/// <summary>
/// Return the best guess of main ipAdress. To get it in the form aaa.bbb.ccc.ddd just call
/// '?.ToString() ?? ""' on the result.
/// </summary>
/// <returns></returns>
public static IPAddress GetMyInternetIpAddress()
{
NetworkInterface ni = GetMainNetworkInterface();
IPAddress ipAddress = GetIpFromMac(ni.GetPhysicalAddress());
if (ipAddress == null) // could it be possible ?
{
ipAddress = GetIpFromMac(ni.GetPhysicalAddress(), AddressFamily.InterNetworkV6);
}
return ipAddress;
}
// ******************************************************************
作为参考，这是我定义它的完整类代码:
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
namespace TcpMonitor
{
/*
Usage:
var cons = TcpHelper.GetAllTCPConnections();
foreach (TcpHelper.MIB_TCPROW_OWNER_PID c in cons) ...
*/
public class NetHelper
{
[DllImport("iphlpapi.dll", SetLastError = true)]
static extern uint GetExtendedUdpTable(IntPtr pUdpTable, ref int dwOutBufLen, bool sort, int ipVersion, UDP_TABLE_CLASS tblClass, uint reserved = 0);
public enum UDP_TABLE_CLASS
{
UDP_TABLE_BASIC,
UDP_TABLE_OWNER_PID,
UDP_TABLE_OWNER_MODULE
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_UDPTABLE_OWNER_PID
{
public uint dwNumEntries;
[MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.Struct, SizeConst = 1)]
public MIB_UDPROW_OWNER_PID[] table;
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_UDPROW_OWNER_PID
{
public uint localAddr;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] localPort;
public uint owningPid;
public uint ProcessId
{
get { return owningPid; }
}
public IPAddress LocalAddress
{
get { return new IPAddress(localAddr); }
}
public ushort LocalPort
{
get { return BitConverter.ToUInt16(localPort.Take(2).Reverse().ToArray(), 0); }
}
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_UDP6TABLE_OWNER_PID
{
public uint dwNumEntries;
[MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.Struct, SizeConst = 1)]
public MIB_UDP6ROW_OWNER_PID[] table;
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_UDP6ROW_OWNER_PID
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
public byte[] localAddr;
public uint localScopeId;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] localPort;
public uint owningPid;
public uint ProcessId
{
get { return owningPid; }
}
public IPAddress LocalAddress
{
get { return new IPAddress(localAddr, localScopeId); }
}
public ushort LocalPort
{
get { return BitConverter.ToUInt16(localPort.Take(2).Reverse().ToArray(), 0); }
}
}
public static List<MIB_UDPROW_OWNER_PID> GetAllUDPConnections()
{
return GetUDPConnections<MIB_UDPROW_OWNER_PID, MIB_UDPTABLE_OWNER_PID> (AF_INET);
}
public static List<MIB_UDP6ROW_OWNER_PID> GetAllUDPv6Connections()
{
return GetUDPConnections<MIB_UDP6ROW_OWNER_PID, MIB_UDP6TABLE_OWNER_PID>(AF_INET6);
}
private static List<IPR> GetUDPConnections<IPR, IPT>(int ipVersion)//IPR = Row Type, IPT = Table Type
{
List<IPR> result = null;
IPR[] tableRows = null;
int buffSize = 0;
var dwNumEntriesField = typeof(IPT).GetField("dwNumEntries");
// how much memory do we need?
uint ret = GetExtendedUdpTable(IntPtr.Zero, ref buffSize, true, ipVersion, UDP_TABLE_CLASS.UDP_TABLE_OWNER_PID);
IntPtr udpTablePtr = Marshal.AllocHGlobal(buffSize);
try
{
ret = GetExtendedUdpTable(udpTablePtr, ref buffSize, true, ipVersion, UDP_TABLE_CLASS.UDP_TABLE_OWNER_PID);
if (ret != 0)
return new List<IPR>();
// get the number of entries in the table
IPT table = (IPT)Marshal.PtrToStructure(udpTablePtr, typeof(IPT));
int rowStructSize = Marshal.SizeOf(typeof(IPR));
uint numEntries = (uint)dwNumEntriesField.GetValue(table);
// buffer we will be returning
tableRows = new IPR[numEntries];
IntPtr rowPtr = (IntPtr)((long)udpTablePtr + 4);
for (int i = 0; i < numEntries; i++)
{
IPR tcpRow = (IPR)Marshal.PtrToStructure(rowPtr, typeof(IPR));
tableRows[i] = tcpRow;
rowPtr = (IntPtr)((long)rowPtr + rowStructSize); // next entry
}
}
finally
{
result = tableRows?.ToList() ?? new List<IPR>();
// Free the Memory
Marshal.FreeHGlobal(udpTablePtr);
}
return result;
}
[DllImport("iphlpapi.dll", SetLastError = true)]
static extern uint GetExtendedTcpTable(IntPtr pTcpTable, ref int dwOutBufLen, bool sort, int ipVersion, TCP_TABLE_CLASS tblClass, uint reserved = 0);
public enum MIB_TCP_STATE
{
MIB_TCP_STATE_CLOSED = 1,
MIB_TCP_STATE_LISTEN = 2,
MIB_TCP_STATE_SYN_SENT = 3,
MIB_TCP_STATE_SYN_RCVD = 4,
MIB_TCP_STATE_ESTAB = 5,
MIB_TCP_STATE_FIN_WAIT1 = 6,
MIB_TCP_STATE_FIN_WAIT2 = 7,
MIB_TCP_STATE_CLOSE_WAIT = 8,
MIB_TCP_STATE_CLOSING = 9,
MIB_TCP_STATE_LAST_ACK = 10,
MIB_TCP_STATE_TIME_WAIT = 11,
MIB_TCP_STATE_DELETE_TCB = 12
}
public enum TCP_TABLE_CLASS
{
TCP_TABLE_BASIC_LISTENER,
TCP_TABLE_BASIC_CONNECTIONS,
TCP_TABLE_BASIC_ALL,
TCP_TABLE_OWNER_PID_LISTENER,
TCP_TABLE_OWNER_PID_CONNECTIONS,
TCP_TABLE_OWNER_PID_ALL,
TCP_TABLE_OWNER_MODULE_LISTENER,
TCP_TABLE_OWNER_MODULE_CONNECTIONS,
TCP_TABLE_OWNER_MODULE_ALL
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_TCPTABLE_OWNER_PID
{
public uint dwNumEntries;
[MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.Struct, SizeConst = 1)]
public MIB_TCPROW_OWNER_PID[] table;
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_TCP6TABLE_OWNER_PID
{
public uint dwNumEntries;
[MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.Struct, SizeConst = 1)]
public MIB_TCP6ROW_OWNER_PID[] table;
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_TCPROW_OWNER_PID
{
public uint state;
public uint localAddr;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] localPort;
public uint remoteAddr;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] remotePort;
public uint owningPid;
public uint ProcessId
{
get { return owningPid; }
}
public IPAddress LocalAddress
{
get { return new IPAddress(localAddr); }
}
public ushort LocalPort
{
get
{
return BitConverter.ToUInt16(new byte[2] { localPort[1], localPort[0] }, 0);
}
}
public IPAddress RemoteAddress
{
get { return new IPAddress(remoteAddr); }
}
public ushort RemotePort
{
get
{
return BitConverter.ToUInt16(new byte[2] { remotePort[1], remotePort[0] }, 0);
}
}
public MIB_TCP_STATE State
{
get { return (MIB_TCP_STATE)state; }
}
}
[StructLayout(LayoutKind.Sequential)]
public struct MIB_TCP6ROW_OWNER_PID
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
public byte[] localAddr;
public uint localScopeId;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] localPort;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
public byte[] remoteAddr;
public uint remoteScopeId;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public byte[] remotePort;
public uint state;
public uint owningPid;
public uint ProcessId
{
get { return owningPid; }
}
public long LocalScopeId
{
get { return localScopeId; }
}
public IPAddress LocalAddress
{
get { return new IPAddress(localAddr, LocalScopeId); }
}
public ushort LocalPort
{
get { return BitConverter.ToUInt16(localPort.Take(2).Reverse().ToArray(), 0); }
}
public long RemoteScopeId
{
get { return remoteScopeId; }
}
public IPAddress RemoteAddress
{
get { return new IPAddress(remoteAddr, RemoteScopeId); }
}
public ushort RemotePort
{
get { return BitConverter.ToUInt16(remotePort.Take(2).Reverse().ToArray(), 0); }
}
public MIB_TCP_STATE State
{
get { return (MIB_TCP_STATE)state; }
}
}
public const int AF_INET = 2; // IP_v4 = System.Net.Sockets.AddressFamily.InterNetwork
public const int AF_INET6 = 23; // IP_v6 = System.Net.Sockets.AddressFamily.InterNetworkV6
public static Task<List<MIB_TCPROW_OWNER_PID>> GetAllTCPConnectionsAsync()
{
return Task.Run(() => GetTCPConnections<MIB_TCPROW_OWNER_PID, MIB_TCPTABLE_OWNER_PID>(AF_INET));
}
public static List<MIB_TCPROW_OWNER_PID> GetAllTCPConnections()
{
return GetTCPConnections<MIB_TCPROW_OWNER_PID, MIB_TCPTABLE_OWNER_PID>(AF_INET);
}
public static Task<List<MIB_TCP6ROW_OWNER_PID>> GetAllTCPv6ConnectionsAsync()
{
return Task.Run(()=>GetTCPConnections<MIB_TCP6ROW_OWNER_PID, MIB_TCP6TABLE_OWNER_PID>(AF_INET6));
}
public static List<MIB_TCP6ROW_OWNER_PID> GetAllTCPv6Connections()
{
return GetTCPConnections<MIB_TCP6ROW_OWNER_PID, MIB_TCP6TABLE_OWNER_PID>(AF_INET6);
}
private static List<IPR> GetTCPConnections<IPR, IPT>(int ipVersion)//IPR = Row Type, IPT = Table Type
{
List<IPR> result = null;
IPR[] tableRows = null;
int buffSize = 0;
var dwNumEntriesField = typeof(IPT).GetField("dwNumEntries");
// how much memory do we need?
uint ret = GetExtendedTcpTable(IntPtr.Zero, ref buffSize, true, ipVersion, TCP_TABLE_CLASS.TCP_TABLE_OWNER_PID_ALL);
IntPtr tcpTablePtr = Marshal.AllocHGlobal(buffSize);
try
{
ret = GetExtendedTcpTable(tcpTablePtr, ref buffSize, true, ipVersion, TCP_TABLE_CLASS.TCP_TABLE_OWNER_PID_ALL);
if (ret != 0)
return new List<IPR>();
// get the number of entries in the table
IPT table = (IPT)Marshal.PtrToStructure(tcpTablePtr, typeof(IPT));
int rowStructSize = Marshal.SizeOf(typeof(IPR));
uint numEntries = (uint)dwNumEntriesField.GetValue(table);
// buffer we will be returning
tableRows = new IPR[numEntries];
IntPtr rowPtr = (IntPtr)((long)tcpTablePtr + 4);
for (int i = 0; i < numEntries; i++)
{
IPR tcpRow = (IPR)Marshal.PtrToStructure(rowPtr, typeof(IPR));
tableRows[i] = tcpRow;
rowPtr = (IntPtr)((long)rowPtr + rowStructSize); // next entry
}
}
finally
{
result = tableRows?.ToList() ?? new List<IPR>();
// Free the Memory
Marshal.FreeHGlobal(tcpTablePtr);
}
return result;
}
public static string GetTcpStateName(MIB_TCP_STATE state)
{
switch (state)
{
case MIB_TCP_STATE.MIB_TCP_STATE_CLOSED:
return "Closed";
case MIB_TCP_STATE.MIB_TCP_STATE_LISTEN:
return "Listen";
case MIB_TCP_STATE.MIB_TCP_STATE_SYN_SENT:
return "SynSent";
case MIB_TCP_STATE.MIB_TCP_STATE_SYN_RCVD:
return "SynReceived";
case MIB_TCP_STATE.MIB_TCP_STATE_ESTAB:
return "Established";
case MIB_TCP_STATE.MIB_TCP_STATE_FIN_WAIT1:
return "FinWait 1";
case MIB_TCP_STATE.MIB_TCP_STATE_FIN_WAIT2:
return "FinWait 2";
case MIB_TCP_STATE.MIB_TCP_STATE_CLOSE_WAIT:
return "CloseWait";
case MIB_TCP_STATE.MIB_TCP_STATE_CLOSING:
return "Closing";
case MIB_TCP_STATE.MIB_TCP_STATE_LAST_ACK:
return "LastAck";
case MIB_TCP_STATE.MIB_TCP_STATE_TIME_WAIT:
return "TimeWait";
case MIB_TCP_STATE.MIB_TCP_STATE_DELETE_TCB:
return "DeleteTCB";
default:
return ((int)state).ToString();
}
}
private static readonly ConcurrentDictionary<string, string> DicOfIpToHostName = new ConcurrentDictionary<string, string>();
public const string UnknownHostName = "Unknown";
// ******************************************************************
public static string GetHostName(IPAddress ipAddress)
{
return GetHostName(ipAddress.ToString());
}
// ******************************************************************
public static string GetHostName(string ipAddress)
{
string hostName = null;
if (!DicOfIpToHostName.TryGetValue(ipAddress, out hostName))
{
try
{
if (ipAddress == "0.0.0.0" || ipAddress == "::")
{
hostName = ipAddress;
}
else
{
hostName = Dns.GetHostEntry(ipAddress).HostName;
}
}
catch (Exception ex)
{
Debug.Print(ex.ToString());
hostName = UnknownHostName;
}
DicOfIpToHostName[ipAddress] = hostName;
}
return hostName;
}
// ************************************************************************
/// <summary>
/// Will search for the an active NetworkInterafce that has a Gateway, otherwise
/// it will fallback to try from the DNS which is not safe.
/// </summary>
/// <returns></returns>
public static NetworkInterface GetMainNetworkInterface()
{
List<NetworkInterface> candidates = new List<NetworkInterface>();
if (NetworkInterface.GetIsNetworkAvailable())
{
NetworkInterface[] NetworkInterfaces =
NetworkInterface.GetAllNetworkInterfaces();
foreach (
NetworkInterface ni in NetworkInterfaces)
{
if (ni.OperationalStatus == OperationalStatus.Up)
candidates.Add(ni);
}
}
if (candidates.Count == 1)
{
return candidates[0];
}
// Accoring to our tech, the main NetworkInterface should have a Gateway
// and it should be the ony one with a gateway.
if (candidates.Count > 1)
{
for (int n = candidates.Count - 1; n >= 0; n--)
{
if (candidates[n].GetIPProperties().GatewayAddresses.Count == 0)
{
candidates.RemoveAt(n);
}
}
if (candidates.Count == 1)
{
return candidates[0];
}
}
// Fallback to try by getting my ipAdress from the dns
IPAddress myMainIpAdress = null;
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork) // Get the first IpV4
{
myMainIpAdress = ip;
break;
}
}
if (myMainIpAdress != null)
{
NetworkInterface[] NetworkInterfaces =
NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface ni in NetworkInterfaces)
{
if (ni.OperationalStatus == OperationalStatus.Up)
{
IPInterfaceProperties props = ni.GetIPProperties();
foreach (UnicastIPAddressInformation ai in props.UnicastAddresses)
{
if (ai.Address.Equals(myMainIpAdress))
{
return ni;
}
}
}
}
}
return null;
}
// ******************************************************************
/// <summary>
/// AddressFamily.InterNetwork = IPv4
/// Thanks to Dr. Wilys Apprentice at
/// http://stackoverflow.com/questions/1069103/how-to-get-the-ip-address-of-the-server-on-which-my-c-sharp-application-is-runni
/// using System.Net.NetworkInformation;
/// </summary>
/// <param name="mac"></param>
/// <param name="addressFamily">AddressFamily.InterNetwork = IPv4, AddressFamily.InterNetworkV6 = IPv6</param>
/// <returns></returns>
public static IPAddress GetIpFromMac(PhysicalAddress mac, AddressFamily addressFamily = AddressFamily.InterNetwork)
{
NetworkInterface[] NetworkInterfaces =
NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface ni in NetworkInterfaces)
{
if (ni.GetPhysicalAddress().Equals(mac))
{
if (ni.OperationalStatus == OperationalStatus.Up)
{
IPInterfaceProperties props = ni.GetIPProperties();
foreach (UnicastIPAddressInformation ai in props.UnicastAddresses)
{
if (ai.DuplicateAddressDetectionState == DuplicateAddressDetectionState.Preferred)
{
if (ai.Address.AddressFamily == addressFamily)
{
return ai.Address;
}
}
}
}
}
}
return null;
}
// ******************************************************************
/// <summary>
/// Return the best guess of main ipAdress. To get it in the form aaa.bbb.ccc.ddd just call
/// '?.ToString() ?? ""' on the result.
/// </summary>
/// <returns></returns>
public static IPAddress GetMyInternetIpAddress()
{
NetworkInterface ni = GetMainNetworkInterface();
IPAddress ipAddress = GetIpFromMac(ni.GetPhysicalAddress());
if (ipAddress == null) // could it be possible ?
{
ipAddress = GetIpFromMac(ni.GetPhysicalAddress(), AddressFamily.InterNetworkV6);
}
return ipAddress;
}
// ******************************************************************
public static bool IsBroadcastAddress(IPAddress ipAddress)
{
if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
{
return ipAddress.GetAddressBytes()[3] == 255;
}
if (ipAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
return false; // NO broadcast in IPv6
}
return false;
}
// ******************************************************************
public static bool IsMulticastAddress(IPAddress ipAddress)
{
if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
{
// Source: https://technet.microsoft.com/en-us/library/cc772041(v=ws.10).aspx
return ipAddress.GetAddressBytes()[0] >= 224 && ipAddress.GetAddressBytes()[0] <= 239;
}
if (ipAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
return ipAddress.IsIPv6Multicast;
}
return false;
}
// ******************************************************************
}
}
不，这几乎是最好的方法。由于一台机器可能有多个IP地址，您需要迭代它们的集合以找到合适的一个。
编辑:我唯一想改变的是改变这个:
if (ip.AddressFamily.ToString() == "InterNetwork")
:
if (ip.AddressFamily == AddressFamily.InterNetwork)
不需要ToString一个枚举进行比较。
namespace NKUtilities
{
using System;
using System.Net;
public class DNSUtility
{
public static int Main (string [] args)
{
String strHostName = new String ("");
if (args.Length == 0)
{
// Getting Ip address of local machine...
// First get the host name of local machine.
strHostName = Dns.GetHostName ();
Console.WriteLine ("Local Machine's Host Name: " + strHostName);
}
else
{
strHostName = args[0];
}
// Then using host name, get the IP address list..
IPHostEntry ipEntry = DNS.GetHostByName (strHostName);
IPAddress [] addr = ipEntry.AddressList;
for (int i = 0; i < addr.Length; i++)
{
Console.WriteLine ("IP Address {0}: {1} ", i, addr[i].ToString ());
}
return 0;
}
}
}
清洁和一体解决方案:D
//This returns the first IP4 address or null
return Dns.GetHostEntry(Dns.GetHostName()).AddressList.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);
