C/S的程序，服务端为webservice，如何控制让前台打开一个窗口，其他用户便无法打开此窗口。

Question

C/S的程序，服务端为webservice，如何控制让前台打开一个窗口，其他用户便无法打开此窗口。本人新手菜鸟，请诸位大神写的详细一些~在此次谢过了

Answer 1

打开的时候传一个值回去给服务端。然后其他人打开判断这个值是true还是false就行。

Answer 2

 public partial class SockUDP : Component
    {
        public SockUDP()
        {
            InitializeComponent();
        }        public SockUDP(IContainer container)
        {
            container.Add(this);            InitializeComponent();
        }        private int UDP_Server_Port;//定义UDP端口
        private System.Threading.Thread thdUdp;//定义线程
        private IPEndPoint _Server = new IPEndPoint(IPAddress.Any, 0);//定义节点
        
        //定义组建的代理和事件
        public delegate void DataArrivalEventHandler(byte[] Data, IPAddress Ip, int Port);
        public event DataArrivalEventHandler DataArrival;        private UdpClient UDP_Server = new UdpClient();        public delegate void Sock_ErrorEventHandler(string ErrString);
        public event Sock_ErrorEventHandler Sock_Error;        [Browsable(true), Category("Client"), Description("获得对方IP地址与端口号等信息.")]
        
        public IPEndPoint Server
        {
            get { return _Server; }
            set { _Server = value; }
        }        //发送UDP数据
        public void Send(System.Net.IPAddress Host, int Port, byte[] Data)
        {
            try
            {
                IPEndPoint server = new IPEndPoint(Host, Port);
                UDP_Server.Send(Data, Data.Length, server);
            }
            catch (Exception e)
            {
                if (Sock_Error != null)
                    Sock_Error(e.ToString());
            }
        }        //监听端口数据报
        public void Listen(int Port)
        {
            try
            {
                UDP_Server_Port = Port;
                UDP_Server = new UdpClient(Port);
                thdUdp = new Thread(new ThreadStart(GetUDPData));
                thdUdp.Start();//启动线程
            }
            catch (Exception e)
            {
                if (Sock_Error != null)
                    Sock_Error(e.ToString());
            }
        }
        
        //获取网络数据
        private void GetUDPData()
        {
            while (true)
            {
                try
                {
                    byte[] RData = UDP_Server.Receive(ref _Server);
                    if (DataArrival != null)
                    {
                        DataArrival(RData, _Server.Address, _Server.Port);
                    }
                    Thread.Sleep(0);
                }
                catch (Exception e)
                {
                    if (Sock_Error != null)
                        Sock_Error(e.ToString());
                }
            }
        }        //关闭连接
        public void CloseSock()
        {
            try
            {
                UDP_Server.Close();
                thdUdp.Abort();
            }
            catch (Exception e)
            {
                if (Sock_Error != null)
                    Sock_Error(e.ToString());
            }
        }
    }
}