什么是做永葆插座检查.NET最好的方法是什么？ [英] what is the best way to do keep alive socket checking in .NET?

问题描述

我要寻找一个方式做一个永葆检查在.NET。该方案是UDP和TCP。

I am looking for a way to do a keep alive check in .NET. The scenario is for both UDP and TCP.

目前在TCP是我做的是，一边连接，当没有数据发送它发送一个永葆每X秒。

Currently in TCP what I do is that one side connects and when there is no data to send it sends a keep alive every X seconds.

我希望对方来检查数据，如果收到秒钟后非，引发一个事件左右。

I want the other side to check for data, and if non was received in X seconds, to raise an event or so.

我试图做一个办法就是做一个阻塞接收和设置套接字的RecieveTimeout以X秒。但问题是每当发生超时，套接字的接收会引发SocketExeception，并在这一侧的接口将关闭，这是正确的行为？为何套接字关闭/死只是去上的超时之后呢？

One way i tried to do was do a blocking receive and set the socket's RecieveTimeout to X seconds. But the problem was whenever the Timeout happened, the socket's Receive would throw an SocketExeception and the socket on this side would close, is this the correct behaviour ? why does the socket close/die after the timeout instead of just going on ?

一个检查，如果有数据和睡眠是不能接受的（因为我可能会落后于接收数据，同时睡觉）。

A check if there is data and sleep isn't acceptable (since I might be lagging on receiving data while sleeping).

那么，什么是去了解这一点的最好办法，为什么是我所描述的另一边失败？

So what is the best way to go about this, and why is the method i described on the other side failing ?

推荐答案

如果你从字面上的意思是的KeepAlive，请尝试以下。

If you literally mean "KeepAlive", try the following.

	public static void SetTcpKeepAlive(Socket socket, uint keepaliveTime, uint keepaliveInterval)
	{
		/* the native structure
		struct tcp_keepalive {
		ULONG onoff;
		ULONG keepalivetime;
		ULONG keepaliveinterval;
		};
		*/

		// marshal the equivalent of the native structure into a byte array
		uint dummy = 0;
		byte[] inOptionValues = new byte[Marshal.SizeOf(dummy) * 3];
		BitConverter.GetBytes((uint)(keepaliveTime)).CopyTo(inOptionValues, 0);
		BitConverter.GetBytes((uint)keepaliveTime).CopyTo(inOptionValues, Marshal.SizeOf(dummy));
		BitConverter.GetBytes((uint)keepaliveInterval).CopyTo(inOptionValues, Marshal.SizeOf(dummy) * 2);

		// write SIO_VALS to Socket IOControl
		socket.IOControl(IOControlCode.KeepAliveValues, inOptionValues, null);
	}

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