如何设置Socket.ConnectAsync的超时时间? [英] How to set a timeout of Socket.ConnectAsync?
问题描述
我一直在阅读有关如何检查LAN上特定端口上的所有侦听服务器的信息,最后我写了一些可以根据需要工作的代码.
我正在使用System.Threading.Tasks.Parallel尽快连接到所有254个IP地址.
例如: 192.168.1. 1 -192.168.1. 254
I've been reading about how to check for all listening server on a specific port on LAN and finally I've wrote some code that it works as I want.
I'm using System.Threading.Tasks.Parallel to connect to all 254 IP Addresses as fast as possible
ex : 192.168.1.1 - 192.168.1.254
我需要为这些连接尝试设置超时时间,因为打印失败大约需要15到20秒:"Connection Failed".所以我该怎么办?
What I need is to set a timeout for these connection attempts, because it takes about 15-20 seconds to print : "Connection Failed " when it fails .. so How do I do that?
这里的客户代码:
static void Main(string[] args)
{
Console.WriteLine("Connecting to IP addresses has started. \n");
Parallel.For(1, 255, i =>
{
Connect("192.168.1." + i);
});
Console.ReadLine();
}
private static void Connect(string ipAdd)
{
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
SocketAsyncEventArgs e = new SocketAsyncEventArgs();
IPEndPoint ipEnd = new IPEndPoint(IPAddress.Parse(ipAdd), 9990);
e.RemoteEndPoint = ipEnd;
e.UserToken = s;
e.Completed += new EventHandler<SocketAsyncEventArgs>(e_Completed);
Console.WriteLine("Trying to connect to : " + ipEnd);
s.ConnectAsync(e);
}
private static void e_Completed(object sender, SocketAsyncEventArgs e)
{
if (e.ConnectSocket != null)
{
StreamReader sr = new StreamReader(new NetworkStream(e.ConnectSocket));
Console.WriteLine("Connection Established : " + e.RemoteEndPoint + " PC NAME : " + sr.ReadLine());
}
else
{
Console.WriteLine("Connection Failed : " + e.RemoteEndPoint);
}
}
服务器代码:
static void Main(string[] args)
{
Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new IPEndPoint(IPAddress.Any,9990);
server.Bind(ep);
server.Listen(100);
Socket client = server.Accept();
NetworkStream stream = new NetworkStream(client);
StreamWriter sw = new StreamWriter(stream)
sw.WriteLine(System.Environment.MachineName);
sw.Flush();
sw.Dispose();
stream.Dispose();
client.Dispose();
server.Dispose();
}
如果有任何提示或通知使它变得更好,请告诉我.我正在使用[.Net 4.0]套接字TCP
对不起,我的英语不好,谢谢..
If there's any hint or notice that makes it better please tell me. I'm using [.Net 4.0] Sockets TCP
Sorry for my bad English and thanks in advance..
推荐答案
我已经找到了解决方案.
首先将所有创建的套接字添加到类型为 SocketAsyncEventArgs 或类型为 Socket 或
的列表中
然后使用System.Timers.Timer关闭所有挂起的连接,并在计时器计时5秒后关闭连接的连接. (timer.Interval = 5000).
I've figured out a solution.
first add all created sockets to a list of type SocketAsyncEventArgs or type ofSocket or
then use System.Timers.Timer to close all pending connection and the connected one after when the timer ticks which is after 5 seconds. (timer.Interval = 5000).
客户代码:
//I've changed my console application to Winform
public ServerDiscovery()
{
InitializeComponent();
timer.Elapsed += timer_tick;
}
System.Timers.Timer timer = new System.Timers.Timer(5000);
List<SocketAsyncEventArgs> list = new List<SocketAsyncEventArgs>();
private void btnRefresh_Click(object sender, EventArgs e)
{
timer.Start();
Parallel.For(1, 255, (i, loopState) =>
{
ConnectTo("192.168.1." + i);
});
}
private void ConnectTo(string ipAdd)
{
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
SocketAsyncEventArgs e = new SocketAsyncEventArgs();
e.RemoteEndPoint = new IPEndPoint(IPAddress.Parse(ipAdd), 9990);
e.UserToken = s;
e.Completed += new EventHandler<SocketAsyncEventArgs>(e_Completed);
list.Add(e); // Add to a list so we dispose all the sockets when the timer ticks.
s.ConnectAsync(e);
}
private void e_Completed(object sender, SocketAsyncEventArgs e)
{
if (e.ConnectSocket != null) //if there's a connection Add its info to a listview
{
StreamReader sr = new StreamReader(new NetworkStream(e.ConnectSocket));
ListViewItem item = new ListViewItem();
item.Text = sr.ReadLine();
item.SubItems.Add(((IPEndPoint)e.RemoteEndPoint).Address.ToString());
item.SubItems.Add("Online");
AddServer(item);
}
}
delegate void AddItem(ListViewItem item);
private void AddServer(ListViewItem item)
{
if (InvokeRequired)
{
Invoke(new AddItem(AddServer), item);
return;
}
listServer.Items.Add(item);
}
private void timer_tick(object sender, EventArgs e)
{
timer.Stop();
foreach (var s in list)
{
((Socket)s.UserToken).Dispose(); //disposing all sockets that's pending or connected.
}
}
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