通常每个套接字地址(协议/网络地址/端口)只允许使用一次。 202.104.236.110:80

[医手]

    public partial class frmMain : Form
    {
        private string hostname = "\u0077\u0077\u0077\u002e\u0068\u0061\u006f\u006c\u0069\u0061\u006f\u007a\u0069\u002e\u0063\u006f\u006d";
        private int port = 80;
        private Encoding en = Encoding.GetEncoding("GB2312");
        private string page = "/test/MySocket.asp";
        private string templete =
@"GET {0} HTTP/1.1
Host:{1}
Connection:close
User-agent:Mozilla/4.0
Accept-language:zh-cn

";
        //private IPEndPoint localPoint = null;//本地端点
        //private IPEndPoint remotePoint = null;//远程端点

        public frmMain()
        {
            InitializeComponent();
        }

        private void btnConnection_Click(object sender, EventArgs e)
        {
            btnConnection.Enabled = false;
            Connection(hostname,port, page);
            GC.Collect();
            btnConnection.Enabled = true;
        }

        private void Connection(string hostname, int port, string page)
        {
            IPEndPoint localPoint = null;//本地端点
            IPEndPoint remotePoint = null;//远程端点
            IPAddress localAddress = Dns.GetHostAddresses(Dns.GetHostName())[0];
            localPoint = new IPEndPoint(localAddress, IPEndPoint.MinPort);
            IPAddress remoteAddress = Dns.GetHostAddresses(hostname)[0];
            remotePoint = new IPEndPoint(remoteAddress, port);
            TcpClient tc = new TcpClient();
            string content = string.Format(templete, page, hostname);

            //设置本地端点
            if (localPoint.Port == IPEndPoint.MinPort)
            {
                while (true)
                {
                    localPoint.Port++;
                    try
                    {
                        tc.Client.Bind(localPoint);
                        break;
                    }
                    catch
                    {
                    }
                }
            }
            else
            {
                try
                {
                    tc.Client.Bind(localPoint);
                }
                catch (Exception ex)
                {
                    txtTarget.Text = "[端口] " + ex.Message;
                    return;
                }
            }
            this.Text = localPoint.ToString();
            //连接
            try
            {
                tc.Connect(remotePoint);
            }
            catch (Exception ex) //有时会报这个错: 通常每个套接字地址(协议/网络地址/端口)只允许使用一次。
            {
                txtTarget.Text = "[连接] " + ex.Message;
                return;
            }

            NetworkStream stream = null;
            try
            {
                stream = tc.GetStream();
            }
            catch (Exception ex)
            {
                txtTarget.Text = "[流] " + ex.Message;
                tc.Close();
                return;
            }
            try
            {
                //写
                byte[] data = en.GetBytes(content);
                stream.Write(data, 0, data.Length);
            }
            catch (Exception ex)
            {
                txtTarget.Text = "[写] " + ex.Message;
            }
            try
            {
                //读
                byte[] data2 = new byte[1024];
                stream.Read(data2, 0, 1024);
                string result = en.GetString(data2);
                txtTarget.Text = result;
            }
            catch (Exception ex)
            {
                txtTarget.Text = "[读]" + ex.Message;
            }
            //关闭
            stream.Close();
            tc.Client.Close();
            tc.Close();
        }

        private void frmMain_FormClosing(object sender, FormClosingEventArgs e)
        {
        }
    }

多点几次btnConnection就会报错了:
通常每个套接字地址(协议/网络地址/端口)只允许使用一次。 202.104.236.110:80

有不少人问过这样的问题了，不过我的情况不太一样。
这里报错的是远程的端口....
我把该关的都关了，并且强制回收了垃圾....

[yagebu1983]

晚上好好研究一下！！

[LovingAlison]

帮你顶

[dabaicai]

顶，想知道结果

[nullpassword]

Mark~

[homejiji]

。。。。你这个。。。程序好乱。。
首先 GC.Collect();这个没有用。。。
如果程序运行到Read或者Write的时候程序都会等待的
都无法直接关闭的
而且请原谅我笨，我真看不懂你的程序。。。

[jietuan]

晚上仔细看看你的代码

[wuyi8808]

up

[wangkuang5]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Management;

using LanServer.Utilities;

namespace LanServer
{
    public partial class FormNetStart : Form
    {
        public FormNetStart()
        {
            InitializeComponent();
        }


        System.Net.IPAddress[] HostIPAddress;

        private System.Net.IPAddress ipsetted;

        public System.Net.IPAddress StartIP
        {
            get { return ipsetted; }
            set { ipsetted = value; }
        }
        private int portsetted;

        public int StartPort 
        {
            get { return portsetted; }
            set { portsetted = value; }
        }
        private void FormNetStart_Load(object sender, EventArgs e)
        {
           //HostIPAddress= Utilities.Utilities. LocalHostIPAddress;
           //string[] ali = Utilities.Utilities.Aliases;
           //for (int i = 0; i < HostIPAddress.Length; i++)
           //{
           //     // 显示当前ip;
           //    this.cdIPAddressList.Items.Add(HostIPAddress[i].ToString());
           //}

            //SELECT   *   FROM   Win32_NetworkAdapterConfiguration")   
            try
            {
                ///将本机的网卡加到列表显示Win32_NetworkAdapterConfiguration 
                ///
                ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
                ManagementObjectCollection moc = mc.GetInstances();
                //ArrayList strArr = new ArrayList();

                //网卡数   
                //foreach (ManagementObject mo in moc)
                //{
                //    if ((bool)mo["IPEnabled"])
                //    {
                //        //cdIPAddressList.Items.Add(mo["Caption"].ToString().Substring(10));
                //        //cdIPAddressList.Items.Add(mo["MacAddress"].ToString());

                //        string[] iplist = mo["IPAddress"] as string[];
                //        cdIPAddressList.Items.AddRange(iplist);
                //    }
                //    mo.Dispose();

                //}
                List<string> iplist = new List<string>();
                List<string> caplist = new List<string>();

                foreach (ManagementObject mo in moc)
                {
                    if ((bool)mo["IPEnabled"])
                    {
                        //cdIPAddressList.Items.Add(mo["Caption"].ToString().Substring(10));
                        //cdIPAddressList.Items.Add(mo["MacAddress"].ToString());

                        caplist.Add(mo["Caption"].ToString().Substring(10));
                        //cdIPAddressList.Items.AddRange(iplist);
                    }
                    mo.Dispose();

                }
                foreach (ManagementObject mo in moc)
                {
                    if ((bool)mo["IPEnabled"])
                    {
                        //cdIPAddressList.Items.Add(mo["Caption"].ToString().Substring(10));
                        //cdIPAddressList.Items.Add(mo["MacAddress"].ToString());

                        iplist.AddRange(mo["IPAddress"] as string[]);
                        //cdIPAddressList.Items.AddRange(iplist);
                    }
                    mo.Dispose();

                }
                if (iplist.Count == caplist.Count)
                {

                    for (int c = 0; c < caplist.Count; c++)
                    {
                        //if (caplist[c].Substring(0,4).StartsWith(" WAN ") == false)
                        //{//VPN网路要去掉
                        //    cdIPAddressList.Items.Add(caplist[c] + "|" + iplist[c]);
                        //}
                        //string ipitem = caplist[c] + "|" + iplist[c];

                        cdIPAddressList.Items.Add(caplist[c] + "|" + iplist[c]);
                    }
                    if (cdIPAddressList.Items.Count > 0)
                        cdIPAddressList.SelectedIndex = 0;

                }
                else
                {
                    throw new ArgumentNullException("ManagementObject", "未能获得本机网络参数，请打开WMI服务");
                } 
            }
            catch (ManagementException mex)
            {
                LanServer.BizLogic.LogWriter.AddSystemException(mex);
            }
            catch (System.Security.SecurityException sex)
            {

                LanServer.BizLogic.LogWriter.AddSystemException(sex);
            }
            catch (Exception ex) {
                LanServer.BizLogic.LogWriter.AddSystemException(ex);
            }



        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            if (cdIPAddressList.SelectedItem == null)
            {
                return;
            }
            //else
            //{|| Utilities.Utilities.ValidateIPAddress(cdIPAddressList.Text) == false
            //    ipsetted = HostIPAddress[cdIPAddressList.SelectedIndex];
            //}
            if (string.IsNullOrEmpty(this.nudPort.Text))
            {
                return;
            }
            if (nudPort.Value  < 1023 || nudPort.Value > 65535)
            {
                //MessageBox.Show(nudPort.Value.ToString());
                nudPort.Value = 9051;
                return;
            }

            //MessageBox.Show(cdIPAddressList.SelectedItem.ToString().Split ('|')[1]);

            //ipsetted = HostIPAddress[cdIPAddressList.SelectedIndex];
            ipsetted = System.Net.IPAddress.Parse(cdIPAddressList.SelectedItem.ToString().Split('|')[1]);
            portsetted = (int)nudPort.Value;


            //检查端口占用


            if (Utilities.Utilities.IsBindEndPoint(ipsetted, portsetted) == true)
            {
                System.Windows.Forms.MessageBox.Show("监听端口已被其他程序占用，不能正确获得在线播放器信息，请修改程序设置？",
                     "UDP端口占用错误", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error);
                return;

            }

            btnStart.DialogResult = DialogResult.OK;
            this.DialogResult = btnStart.DialogResult;
        }
    }
}

[wangkuang5]

  
        /// <summary>
        /// UDP检查端口绑定
        /// </summary>
        /// <param name="localip"></param>
        /// <param name="port"></param>
        /// <returns></returns>
        public static bool IsBindEndPoint(System.Net.IPAddress localip,int port)
        {
            System.Net.IPEndPoint ipe = new System.Net.IPEndPoint(localip, port);
            System.Net.Sockets.Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
           
            try
            {
                s.Bind(ipe);
                return false;
            }
            catch (System.Net.Sockets.SocketException ex)
            {
                if (ex.SocketErrorCode == System.Net.Sockets.SocketError.AddressAlreadyInUse)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            finally
            {
                s.Close();
                s = null;
            }
        }

        /// <summary>
        /// 判断是否合法IP   /// </summary>
        /// <param name="strIP"></param>
        /// <returns></returns>
        public static bool ValidateIPAddress(string strIP)
        {
            //if (null == strIP || "" == strIP.Trim() || Convert.IsDBNull(strIP))
            if (string.IsNullOrEmpty(strIP.Trim()) || Convert.IsDBNull(strIP))
            { return false; }

            return System.Text.RegularExpressions.Regex.IsMatch(strIP, @"^((\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$");
        }

希望这段对你有帮助
我的程序是要求启动主窗口时就检查绑定

[staronline]

先 Shutdown(SocketShutdown.Both) 一下看看可以不

[医手]

沉底了....

[kellynic]

很简单，不要调用关闭流、连接就什么事也没了。。

stream.Close();
tc.Client.Close();
tc.Close();

[mymogal]

刚好遇到这个问题不知怎么办

[mazan604]

private int port = 80;
把80这个端口换成别的端口，每运行一次程序，都要换一个没用过的端口，因为，再上一次运行的时候，端口已经被绑定占用了

[wanglei451]

顶 最后怎么解决的？