.NET 4.0 上的 System.Net.Dns.GetHostEntry(dnsServer) 问题

发布于 2024-08-29 23:00:24 字数 917 浏览 8 评论 0原文

我已经在 .NET 2.0/3.5 环境中使用以下代码几个月了（没有问题）：

string server="192.168.1.3";
IPHostEntry ipe = System.Net.Dns.GetHostEntry(server);
IPAddress ipa = ipe.AddressList[0];
IPEndPoint ipep = new IPEndPoint(ipa, (int)UdpServices.Domain);

这里，服务器被硬编码为 IP 地址，但在我的应用程序中它可能是类似“server.test.com”的东西。

将我的项目转换为 .NET 4.0 时，此代码在直接传递 IP 地址时停止工作（仍然适用于主机名）。它因以下异常而崩溃：

System.Net.Sockets.SocketException was unhandled
  Message=The requested name is valid, but no data of the requested type was found
  Source=System
  ErrorCode=11004
  NativeErrorCode=11004
  StackTrace:
       at System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6)
       at System.Net.Dns.GetHostEntry(String hostNameOrAddress)

因为我需要的只是生成的 IPEndPoint，所以我可以通过使用 IPAddress.Parse 生成 IPAddress 对象来解决该问题，但我想知道你们中是否有人知道为什么此行为在 .NET 4.0 中发生变化？（如果我们无法从 IP 地址解析主机名，则会抛出异常）。

原文

I have been using the following code for months (without problem) in a .NET 2.0/3.5 environment:

string server="192.168.1.3";
IPHostEntry ipe = System.Net.Dns.GetHostEntry(server);
IPAddress ipa = ipe.AddressList[0];
IPEndPoint ipep = new IPEndPoint(ipa, (int)UdpServices.Domain);

Here, server is hardcoded to an IP address, but in my application it could potentially be something like "server.test.com".

When converting my project to .NET 4.0, this code stopped working when directly passing an IP address (still works with a hostname). It crashes with this exception:

System.Net.Sockets.SocketException was unhandled
  Message=The requested name is valid, but no data of the requested type was found
  Source=System
  ErrorCode=11004
  NativeErrorCode=11004
  StackTrace:
       at System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6)
       at System.Net.Dns.GetHostEntry(String hostNameOrAddress)

Because all I need is the resulting IPEndPoint, I can work around the issue by using IPAddress.Parse to generate the IPAddress object, but I want to know if any of you know why this behaviour changed in .NET 4.0? (If we can't resolve the hostname from the IP address, an exception is now thrown).

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