在Mono上运行的C#中获取FQDN [英] Get FQDN in C# running on Mono

问题描述

我正在使用Xamarin.mac.我需要获取本地计算机的标准域名.在Windows上，此代码有效:

I'm using Xamarin.mac. I need to get the fully qualified domain name of the local computer. On Windows this code works:

public string GetFQDN()
{
  string domainName = System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties().DomainName;
  string hostName = Dns.GetHostName();
  string fqdn = "";
  if (!hostName.Contains(domainName))
    fqdn = hostName + "." + domainName;
  else
    fqdn = hostName;

  return fqdn;
}

在Mac上，此代码会导致以下错误: System.NotSupportedException: This platform is not supported .

On a mac this code causes this error: System.NotSupportedException: This platform is not supported.

那么，Xamarin.mac中的等效项是什么?还是只在Mono中?

So, what is the equivalent in Xamarin.mac? Or just in Mono?

仅获取计算机名称将是一个好的开始.

Just getting the computer name would be a good start.

推荐答案

要做到这一点，您几乎可以像在UNIX系统上的C语言中一样进行操作，即使用gethostname()和然后使用DNS查找来查找主机的规范网络名称.幸运的是，System.Net已经为此提供了现成的调用.以下代码在OS X和Linux上均应正常工作(实际上，在Linux上，它或多或少是hostname --fqdn的作用):

To do this, you can pretty much do the same you'd do in C on a UNIX system, which is to retrieve the hostname with gethostname() and then use a DNS lookup to find the canonical network name for the host. Luckily, System.Net has ready-made calls for this. The following code should work on both OS X and Linux (in fact, on Linux it is more or less what hostname --fqdn does):

using System;
using System.Net;

class Program {
  static void Main() {
    // Step 1: Get the host name
    var hostname = Dns.GetHostName();
    // Step 2: Perform a DNS lookup.
    // Note that the lookup is not guaranteed to succeed, especially
    // if the system is misconfigured. On the other hand, if that
    // happens, you probably can't connect to the host by name, anyway.
    var hostinfo = Dns.GetHostEntry(hostname);
    // Step 3: Retrieve the canonical name.
    var fqdn = hostinfo.HostName;
    Console.WriteLine("FQDN: {0}", fqdn);
  }
}

请注意，如果DNS配置错误，则DNS查找可能会失败，或者您可能会获得无用的"localhost.localdomain".

Note that with a misconfigured DNS, the DNS lookup may fail, or you may get the rather useless "localhost.localdomain".

如果您想模仿原始方法，则可以使用以下代码来检索域名:

If you wish to emulate your original approach, you can use the following code to retrieve the domainname:

var domainname = new StringBuilder(256);
Mono.Unix.Native.Syscall.getdomainname(domainname,
  (ulong) domainname.Capacity - 1);

为此，您需要将Mono.Posix程序集添加到您的构建中.

You will need to add the Mono.Posix assembly to your build for this.

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