关闭 C# 套接字

Question

我有一个带有以下代码的按钮：

private void button1_Click(object sender, EventArgs e)
{
    IPHostEntry host = Dns.GetHostEntry(entered_ip);

    foreach (var address in host.AddressList)
    {
        var ipe = new IPEndPoint(address, 7779);
        var samp = new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

        samp.Connect(ipe);

        if (samp.Connected)
        {
            enable_anticheat();

            Process.Start("samp://" + entered_ip + ":" + entered_port);
            break;
        }
        else
        {
            continue;
        }
    }
}

我想在应用程序关闭时关闭套接字samp 。 但是怎么可能关闭呢？ 我知道套接字是通过调用samp.Close()关闭的，但是如果我在表单的FormClosing事件中添加它，我会得到错误element does not exist in the current context 。

我尝试使用的代码是：

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    samp.Close();
}

谢谢。

Answer 1

好了，尽管我应该提到您可能不想继续单击按钮，否则它会打开所有相同连接的各种套接字，或者至少抛出错误。：

private List<Socket> samp = new List<Socket>();

private void button1_Click(object sender, EventArgs e)
{   
        //If you don't want the error
        //if(samp.Count > 0) return;
        IPHostEntry host = null;
        Socket sock;
        host = Dns.GetHostEntry(entered_ip);

        foreach (IPAddress address in host.AddressList)
        {

            IPEndPoint ipe = new IPEndPoint(address, 7779);
            sock = new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

            sock.Connect(ipe);

            if (sock.Connected)
            {
                enable_anticheat();
                samp.Add(sock);
                Process.Start("samp://" + entered_ip + ":" + entered_port);
                break;
            } //The else continue is unnecessary. 
        }
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if(samp.Count > 0) {
      foreach(Socket s in samp) {
         s.close();             
      }
    }
}