如何确定本地主机的 IPv4 地址?
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【中文标题】如何确定本地主机的 IPv4 地址?【英文标题】:How do I determine the local host’s IPv4 addresses? 【发布时间】:2011-10-03 20:55:39 【问题描述】:如何仅从Dns.GetHostAddresses()
获取Internet Protocol version 4 地址?我有下面的代码,它给了我 IPv4 和 IPv6 地址。
我必须让它与具有多个 IPv4 地址的盒子一起工作。
IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());
private void get_IPs()
foreach (IPAddress a in localIPs)
server_ip = server_ip + a.ToString() + "/";
【问题讨论】:
【参考方案1】:这是使用 for 循环查找第一个连接的 IPv4 的代码:
IPAddress ipAddress = null;
IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());
for (int i=0 ; i<localIPs.Length ; i++)
if (localIPs[i].AddressFamily == AddressFamily.InterNetwork)
ipAddress = localIPs[i];
break;
【讨论】:
【参考方案2】:这是我的代码。 并且可以在许多 LAN 卡上找到它。
private string GetLocalIpAddress()
string localIpAddress = string.Empty;
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface nic in nics)
if (nic.OperationalStatus != OperationalStatus.Up)
continue;
IPv4InterfaceStatistics adapterStat = (nic).GetIPv4Statistics();
UnicastIPAddressInformationCollection uniCast = (nic).GetIPProperties().UnicastAddresses;
if (uniCast != null)
foreach (UnicastIPAddressInformation uni in uniCast)
if (adapterStat.UnicastPacketsReceived > 0
&& adapterStat.UnicastPacketsSent > 0
&& nic.NetworkInterfaceType != NetworkInterfaceType.Loopback)
if (uni.Address.AddressFamily == AddressFamily.InterNetwork)
localIpAddress = nic.GetIPProperties().UnicastAddresses[0].Address.ToString();
break;
return localIpAddress;
【讨论】:
【参考方案3】:对我来说,更清洁的解决方案是:
public static string GetLocalIP()
string ipv4Address = String.Empty;
foreach (IPAddress currentIPAddress in Dns.GetHostAddresses(Dns.GetHostName()))
if (currentIPAddress.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
ipv4Address = currentIPAddress.ToString();
break;
return ipv4Address;
【讨论】:
此函数返回一个地址,但问题指出它必须支持具有多个 IPv4 地址的主机。【参考方案4】:我使用了以
开头的答案/// <summary> and it mostly worked:
//for some reason Visual Studio 2010 did not understand AddressFamily.Inernetwork
if (address.Address.AddressFamily != AddressFamily.InterNetwork)
我不得不使用:
if(address.Address.AddressFamily != System.Net.Sockets.AddressFamily.InterNetwork)
但我实际使用过:
if(!address.Address.AddressFamily.Equals(System.Net.Sockets.AddressFamily.InterNetwork))
另外,我补充说:
if (network.OperationalStatus != OperationalStatus.Up)
continue;
因为有些网络无法正常工作并且不应该存在,所以我确实看到它们在注册表中。 ---阿尔文
【讨论】:
【参考方案5】:我使用这个帮助方法,在过滤掉 IPV6 和 Loopback 一次后返回第一个活动的 IPV4 地址
public static IPAddress GetLocalIPAddress()
IPAddress result = null;
IPHostEntry iphostentry = Dns.GetHostEntry(Dns.GetHostName());
IPAddress[] ipv4Address = Array.FindAll(iphostentry.AddressList, add => add.AddressFamily == AddressFamily.InterNetwork && !IPAddress.IsLoopback(add));
if (ipv4Address.Length > 0 )
result =ipv4Address[0];
return result;
【讨论】:
【参考方案6】:使用 Linq 时非常干净和甜美
IPAddress[] addresses = Dns.GetHostAddresses(Dns.GetHostName()).Where(a => a.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork).ToArray();
【讨论】:
【参考方案7】:这是我使用的一个函数:
public static string GetIP4Address()
string IP4Address = String.Empty;
foreach (IPAddress IPA in Dns.GetHostAddresses(Dns.GetHostName()))
if (IPA.AddressFamily == AddressFamily.InterNetwork)
IP4Address = IPA.ToString();
break;
return IP4Address;
作为可枚举:
public static IEnumerable<string> GetIP4Addresses()
return Dns.GetHostAddresses(Dns.GetHostName())
.Where(IPA => IPA.AddressFamily == AddressFamily.InterNetwork)
.Select(x => x.ToString());
【讨论】:
我不建议与字符串进行比较,因为这需要通过反射查找枚举值并执行字符串比较。特别是因为您可以毫无问题地与枚举AddressFamily.InterNetwork
进行比较。
此函数返回一个地址,但问题指出它必须支持具有多个 IPv4 地址的主机。【参考方案8】:
来自my blog:
/// <summary>
/// This utility function displays all the IP (v4, not v6) addresses of the local computer.
/// </summary>
public static void DisplayIPAddresses()
StringBuilder sb = new StringBuilder();
// Get a list of all network interfaces (usually one per network card, dialup, and *** connection)
NetworkInterface[] networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface network in networkInterfaces)
// Read the IP configuration for each network
IPInterfaceProperties properties = network.GetIPProperties();
// 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;
sb.AppendLine(address.Address.ToString() + " (" + network.Name + ")");
MessageBox.Show(sb.ToString());
特别是,我不推荐Dns.GetHostAddresses(Dns.GetHostName());
,不管这句话在各种文章和博客上有多受欢迎。
【讨论】:
我很难用 Dns 获得正确的结果.....这正是我想要的。谢谢 之前在 Azure 中托管的网站遇到了问题。但是,这与您提到的 Dns.GetHostAddress 方法相比效果很好【参考方案9】:来自MSDN on Dns.GetHostAddresses,
当一个空字符串作为主机名传递时,此方法返回 所有操作系统的本地主机的 IPv4 地址,除了 视窗服务器 2003;对于 Windows Server 2003,IPv4 和 IPv6 返回本地主机的地址。
从 GetHostAddresses 的结果中过滤 IPv6 地址 如果本地计算机没有安装 IPv6,则使用此方法。作为一个 结果,有可能取回一个空的 IPAddress 实例,只要 可用于 hostNameOrAddress.parameter 的 IPv6 结果。
所以,你可以用这个try and parse it:
IPAddress.TryParse
然后检查AddressFamily
是哪个
为 IPv4 返回 System.Net.Sockets.AddressFamily.InterNetwork 或 用于 IPv6 的 System.Net.Sockets.AddressFamily.InterNetworkV6。
string input = "192.168.0.10";
IPAddress address;
if (IPAddress.TryParse(input, out address))
switch (address.AddressFamily)
case System.Net.Sockets.AddressFamily.InterNetwork:
// we have IPv4
break;
case System.Net.Sockets.AddressFamily.InterNetworkV6:
// we have IPv6
break;
default:
// do something else
break;
【讨论】:
【参考方案10】:在您的代码中添加类似的内容
if( IPAddress.Parse(a).AddressFamily == AddressFamily.InterNetwork )
// IPv4 address
【讨论】:
foreach (IPAddress a in localIPs) if (a.IsIPv6LinkLocal == false) server_ip = server_ip + a.ToString() + "/"; 问题是我从这个方法收到了一个 169.254.x.x 地址。【参考方案11】:写locaIPs.Where(ip => ip.AddressFamily == AddressFamily.InterNetwork)
【讨论】:
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