将HostName解析为IP

Question

我经历了很多谷歌搜索,我发现很多例子都不适用于我.这是一个简单的问题,我觉得有一个简单的答案,没有定义新的类\ modules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？

Answer 1

您只需使用DNS类即可:

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);
}

Answer 2

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

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

来自howtogeek

Answer 3

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，请尝试使用此代码段：

using System.Linq;

string host = "google.com";

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