如何访问添加到 HashSet 的最后一个对象？
我有一个 HashSet，它是客户端套接字的集合。当客户端连接时，套接字将被添加到 HashSet 中。然后我需要访问该套接字，但我不知道如何在 HashSet 中访问它。
...
clientSockets.Add(listenerSocket.EndAccept(async));
WaitForData(lastAddedSocket);
....
我如何确定 lastAddedSocket 是什么？
I have a HashSet that is a collection of client sockets. When a client connects, the socket is added to the HashSet. I then need to access that socket, but I don't know how to access it in the HashSet.
...
clientSockets.Add(listenerSocket.EndAccept(async));
WaitForData(lastAddedSocket);
....
How could I determine what lastAddedSocket is?
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无法询问 HashSet“最后添加到你身上的东西是什么？”顺序全乱了。
您应该简单地保留一个名为
lastAddedSocket的单独变量。每次向 HashSet 添加套接字时，也将其分配给lastAddedSocket。然后你就可以在固定的时间内轻松地查找它。There is no way to ask a HashSet "what was the last thing that was added to you?" The order is all jumbled up.
You should simply keep a separate variable called
lastAddedSocket. Every time you add a socket to the HashSet, also assign it tolastAddedSocket. Then you will be able to look it up easily and in constant time.人们普遍认为哈希集的顺序是无法保证的。虽然 Java 文档直接指出了这一点，但 MSDN 给出的最接近的是
信息感谢： HashSet 是否保留插入顺序？
也就是说，它您自己保留最后一个套接字应该相当容易。
It is generally understood that a hashset's order is not guaranteed. While the Java documentation comes right out and says this the closest the MSDN comes is
Information thanks to: Does HashSet preserve insertion order?
That said, it should be fairly easy for you to preserve your last socket yourself.
当您删除最后一个时，您可能希望最后一个是上一个-最后一个。我建议使用 Queue<>除了 HashSet 之外，您还可以始终记住它们到达的顺序，以防最后一个消失。
You will probably want your last to be previous-last when you delete the last one. I recommend using Queue<> in addition to the HashSet so you will be able always remember the sequence in which they arrived, in case that last goes away.