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】：
标签： c# ip-address ipv4
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】：
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】：
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】：
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】：
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】：
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】：
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】：
AddressFamily.InterNetwork 进行比较。
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 VPN 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】：
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】：
在您的代码中添加类似的内容
if( IPAddress.Parse(a).AddressFamily == AddressFamily.InterNetwork )
// IPv4 address
【讨论】：
写locaIPs.Where(ip => ip.AddressFamily == AddressFamily.InterNetwork)
【讨论】：