form1.cs

清华大学出版社出版的 移动应用开发宝典 张大威（2008）的附书源代码

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

namespace NamedEvents
{
    public partial class Form1 : Form
    {
        private Chapter14.Threading.EventWaitHandle hQuit;

        public Form1()
        {
            InitializeComponent();

            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //event to kill the worker thread
            hQuit = new Chapter14.Threading.EventWaitHandle(false, Chapter14.Threading.EventResetMode.AutoReset, null);
            //setup the named events
            Notify.RegisterNamedEvent(NotificationEvent.NetConnect, "NetConnected");
            Notify.RegisterNamedEvent(NotificationEvent.NetDisconnect, "NetDisconnected");

            System.Threading.Thread eventThread = new System.Threading.Thread(new System.Threading.ThreadStart(EventThread));
            eventThread.IsBackground = true;
            eventThread.Start();
        }

        private void Connected(object sender, EventArgs e)
        {
            this.BackColor = Color.Green;
        }

        private void Disconnected(object sender, EventArgs e)
        {
            this.BackColor = Color.Red;
        }

        private void EventThread()
        {
            Chapter14.Threading.EventWaitHandle hConnected = new Chapter14.Threading.EventWaitHandle(false, Chapter14.Threading.EventResetMode.AutoReset, "NetConnected");
            Chapter14.Threading.EventWaitHandle hDisconnected = new Chapter14.Threading.EventWaitHandle(false, Chapter14.Threading.EventResetMode.AutoReset, "NetDisconnected");

            while (true)
            {
                int eventIndex = Chapter14.Threading.EventWaitHandle.WaitAny(new System.Threading.WaitHandle[] { hQuit, hConnected, hDisconnected });

                switch (eventIndex)
                {
                    case 0:
                        hConnected.Close();
                        hDisconnected.Close();
                        hQuit.Close();
                        return;
                    case 1:
                        //we are on a background thread so invoke
                        Invoke(new EventHandler(Connected));
                        break;
                    case 2:
                        Invoke(new EventHandler(Disconnected));
                        break;
                }
            }


        }

        private void Form1_Closing(object sender, CancelEventArgs e)
        {
            //stop the system raising these events
            Notify.UnregisterNamedEvent("NetConnected");
            Notify.UnregisterNamedEvent("NetDisconnected");

            //signal our control event to close background thread
            hQuit.Set();
        }
    }
}