Winform 单实例运行 -- 新的呈现方式

   

    讨论见原帖（如何操作我的程序的另一个实例(进程)）：
http://topic.csdn.net/u/20081221/01/457bb3b1-2f19-47e2-9621-cf4117ee45ce.html


     

      
       

        using
         System;

        using
         System.Threading;

        using
         System.Windows.Forms;


        static
         
        class
         Program
{
 
        public
         
        static
         EventWaitHandle ProgramStarted;

 [STAThread]
 
        static
         
        void
         Main()
 {
 
        //
         尝试创建一个命名事件
        

         
        bool
         createNew;
 ProgramStarted 
        =
         
        new
         EventWaitHandle(
        false
        , EventResetMode.AutoReset, 
        "
        MyStartEvent
        "
        , 
        out
         createNew);

 
        //
         如果该命名事件已经存在(存在有前一个运行实例)，则发事件通知并退出
        

         
        if
         (
        !
        createNew)
 {
 ProgramStarted.Set();
 
        return
        ;
 }

 Application.EnableVisualStyles();
 Application.SetCompatibleTextRenderingDefault(
        false
        );
 Application.Run(
        new
         Form1());
 }
}



C# code


        //
         Form1.cs

        //

        using
         System;

        using
         System.Windows.Forms;

        using
         System.Threading;


        public
         
        partial
         
        class
         Form1 : Form
{
 NotifyIcon notifyIcon1 
        =
         
        new
         NotifyIcon();

 
        public
         Form1()
 {
 
        //
        InitializeComponent();
        

         
        this
        .notifyIcon1.Text 
        =
         
        "
        Double click me to show window
        "
        ;
 
        this
        .notifyIcon1.Icon 
        =
         System.Drawing.SystemIcons.Information;
 
        this
        .notifyIcon1.DoubleClick 
        +=
         OnNotifyIconDoubleClicked;
 
        this
        .SizeChanged 
        +=
         OnSizeChanged;
 ThreadPool.RegisterWaitForSingleObject(Program.ProgramStarted, OnProgramStarted, 
        null
        , 
        -
        1
        , 
        false
        );
 }

 
        //
         当最小化时，放到系统托盘。
        

         
        void
         OnSizeChanged(
        object
         sender, EventArgs e)
 {
 
        if
         (
        this
        .WindowState 
        ==
         FormWindowState.Minimized)
 {
 
        this
        .notifyIcon1.Visible 
        =
         
        true
        ;
 
        this
        .Visible 
        =
         
        false
        ;
 }
 }

 
        //
         当双击托盘图标时，恢复窗口显示
        

         
        void
         OnNotifyIconDoubleClicked(
        object
         sender, EventArgs e)
 {
 
        this
        .Visible 
        =
         
        true
        ;
 
        this
        .notifyIcon1.Visible 
        =
         
        false
        ;
 
        this
        .WindowState 
        =
         FormWindowState.Normal;
 }

 
        //
         当收到第二个进程的通知时，显示气球消息
        

         
        void
         OnProgramStarted(
        object
         state, 
        bool
         timeout)
 {
 
        this
        .notifyIcon1.ShowBalloonTip(
        2000
        , 
        "
        Hello
        "
        , 
        "
        I am here...
        "
        , ToolTipIcon.Info);
 }
}