c# - 将主机名解析为 IP

Question

我为此进行了很多谷歌搜索，我发现了很多例子，但没有一个对我有用。这是一个简单的问题，我觉得有一个简单的答案，无需定义新的类\模块等......

我的代码是这样的：

Console.WriteLine ("Please enter an IP address or hostname");
string host = Console.ReadLine ();
***IP = resolved "host"*** 
Socket s = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);    
s.Connect (IP, 80);
s.close();

我如何实际解析 IP 变量？

score 91 · Accepted Answer

您可以简单地使用DNS类来执行此操作：

IPHostEntry hostEntry;

hostEntry= Dns.GetHostEntry(host);

//you might get more than one ip for a hostname since 
//DNS supports more than one record

if (hostEntry.AddressList.Length > 0)
{
      var ip = hostEntry.AddressList[0];
      Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
      s.Connect(ip, 80);
}

score 35 · Accepted Answer

string howtogeek = "www.howtogeek.com";
IPAddress[] addresslist = Dns.GetHostAddresses(howtogeek);

foreach (IPAddress theaddress in addresslist)
{
   Console.WriteLine(theaddress.ToString());
 }

从howtogeek

score 10 · Accepted Answer

请注意，接受的答案可以解析为 IPv6。我试图连接到不接受 IPv6 作为输入字符串的服务。

因此，如果您想获得 IPv4，请尝试以下代码段：

using System.Linq;

string host = "google.com";

Dns.GetHostEntry(host).AddressList.First(addr => addr.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)

score 2 · Accepted Answer

这是我用来将主机名解析为 IPv4 和/或 IPv6 的方法。

    using System.Net:

    // A host can have multiple IP addresses!
    public static IPAddress[] GetIPsByName(string hostName, bool ip4Wanted, bool ip6Wanted)
    {
        // Check if the hostname is already an IPAddress
        IPAddress outIpAddress;
        if (IPAddress.TryParse(hostName, out outIpAddress) == true)
            return new IPAddress[] { outIpAddress };
        //<----------

        IPAddress[] addresslist = Dns.GetHostAddresses(hostName);

        if (addresslist == null || addresslist.Length == 0)
            return new IPAddress[0];
        //<----------

        if (ip4Wanted && ip6Wanted)
            return addresslist;
        //<----------

        if (ip4Wanted)
            return addresslist.Where(o => o.AddressFamily == AddressFamily.InterNetwork).ToArray();
        //<----------

        if (ip6Wanted)
            return addresslist.Where(o => o.AddressFamily == AddressFamily.InterNetworkV6).ToArray();
        //<----------

        return new IPAddress[0];
    }

score 0 · Accepted Answer

IpAddress 具有将主机名解析为 IpAddress 的适当方法。

IPAddress addr = IPAddress.Parse(hostName)

c# - 将主机名解析为 IP

5 回答 5

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