如何找到分配给 UDP 客户端的端口号(在 .net/C# 中)? [英] How do I find the port number assigned to a UDP client (in .net/C#)?

问题描述

如果我使用

var socket = new UdpClient(0,AddressFamily.InterNetwork);

然后我如何找到套接字的端口?

How do I then find the port of the socket?

我可能是愚蠢的，但我在 MSDN/Google 上运气不佳(可能是因为星期五是 4:42 并且阳光明媚).

I'm probably being daft, but I'm not having luck in MSDN/Google (probably because it is 4:42 on a Friday and the sun is shining).

背景:

我想要做的是找到一个开放的端口，然后向另一个进程报告在该端口上将消息转发给我.可能有多个客户端，所以我不想使用固定端口.

What I want to do is find an open port, and then report to another process to forward messages to me on that port. There may be multiple clients, so I don't want to used a fixed port.

谢谢.

推荐答案

UdpClient 是 Socket 类的包装器，它通过 LocalEndPoint 属性公开它绑定到的端点.由于您使用的是 UDP/IP 客户端，因此它是一个具有所需端口属性的 IPEndPoint:

UdpClient is a wrapper around the Socket class which exposes the endpoint it's bound to through the LocalEndPoint property. Since you're using an UDP/IP client it's an IPEndPoint which has the desired Port property:

int port = ((IPEndPoint)socket.Client.LocalEndPoint).Port;

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