WPF programming, the program uses the system tray icon function and imitates a method of QQ flashing.

The premise is that the tray display function of the program has been realized, and then a normal icon and a transparent icon are used to cycle through the timer to achieve a flashing effect. 

1. Define fields

        DispatcherTimer timer = new DispatcherTimer();//定时器
        bool change = false;//切换图标

        System.Drawing.Icon icon1 = new System.Drawing.Icon(System.Windows.Application.GetResourceStream(new Uri("/Photo/WPF.ico", UriKind.Relative)).Stream);//程序图标
        System.Drawing.Icon icon2 = new System.Drawing.Icon(System.Windows.Application.GetResourceStream(new Uri("/Photo/WPF2.ico", UriKind.Relative)).Stream);//程序图标

        System.Drawing.Icon icon3 =  (Properties.Resources.WPF3);//程序图标，这里图片做为一种资源放在了资源文件里，也可以像以上的写法定义。 

2. The initial timer in the event

            timer.Tick += new EventHandler(timer_Tick);
            timer.Interval = TimeSpan.FromMilliseconds(500);

3. Events that are executed regularly

        private void timer_Tick(object sender, EventArgs e)
        {
            //判断是否最小化，这里的notifyIcon是一个具体的new出来的实例
            if (ws == WindowState.Minimized)
            {
                if (!change)
                {
                    this.notifyIcon.Icon = icon1;
                    change = true;
                }
                else
                {
                    this.notifyIcon.Icon = icon3;
                    change = false;
                }
            }
        }