检查如果一个端口是开放的 [英] Check if a port is open

问题描述

我似乎无法找到任何东西，告诉我，如果我在路由器端口是开放与否。 这甚至可能？

在code我现在并没有真正似乎工作...

 私人无效的SCANport（）
    {
        字符串主机=localhost的;
        INT PORTNO = 9081;
        ip地址IPA =（ip地址）Dns.GetHostAddresses（主机名）[0];
        尝试
        {
            System.Net.Sockets.Socket袜子=
                新System.Net.Sockets.Socket（System.Net.Sockets.AddressFamily.InterNetwork，
                                              System.Net.Sockets.SocketType.Stream，
                                              System.Net.Sockets.ProtocolType.Tcp）;
            sock.Connect（IPA，PORTNO）;
            如果（sock.Connected ==真）//端口正在使用中，连接成功
                的MessageBox.show（端口关闭）;
            sock.Close（）;

        }
        赶上（System.Net.Sockets.SocketException前）
        {
            如果（ex.Error code == 10061）//端口没有用，无法建立连接
                的MessageBox.show（端口是开放的！）;
            其他
                的MessageBox.show（ex.Message）;
        }
    }
 

解决方案

试试这个：

 使用（的TcpClient的TcpClient =新的TcpClient（））
{
    尝试 {
        tcpClient.Connect（127.0.0.1，9081）;
        Console.WriteLine（打开端口）;
    }赶上（例外）{
        Console.WriteLine（端口封闭）;
    }
}
 

您或许应该改变127.0.0.1到像192.168.0.1或任何你的路由器的IP地址。

I can't seem to find anything that tells me if a port in my router is open or not. Is this even possible?

The code I have right now doesn't really seem to work...

private void ScanPort()
    {
        string hostname = "localhost";
        int portno = 9081;
        IPAddress ipa = (IPAddress) Dns.GetHostAddresses(hostname)[0];
        try
        {
            System.Net.Sockets.Socket sock =
                new System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork,
                                              System.Net.Sockets.SocketType.Stream,
                                              System.Net.Sockets.ProtocolType.Tcp);
            sock.Connect(ipa, portno);
            if (sock.Connected == true) // Port is in use and connection is successful
                MessageBox.Show("Port is Closed");
            sock.Close();

        }
        catch (System.Net.Sockets.SocketException ex)
        {
            if (ex.ErrorCode == 10061) // Port is unused and could not establish connection 
                MessageBox.Show("Port is Open!");
            else
                MessageBox.Show(ex.Message);
        }
    }

解决方案

Try this:

using(TcpClient tcpClient = new TcpClient())
{
    try {
        tcpClient.Connect("127.0.0.1", 9081);
        Console.WriteLine("Port open");
    } catch (Exception) {
        Console.WriteLine("Port closed");
    }
}

You should probably change 127.0.0.1 to something like 192.168.0.1 or whatever your router's IP address is.

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