Winform 單一實例運行 — 新的呈現方式

討論見原帖（如何操作我的程式的另一個執行個體(進程)）：
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()
    {
// 嘗試建立一個命名事件
        bool createNew;
        ProgramStarted = new EventWaitHandle(false, EventResetMode.AutoReset, "MyStartEvent", out createNew);

// 如果該命名事件已經存在(存在有前一個運行執行個體)，則發事件通知並退出
        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);
    }

// 當最小化時，放到系統托盤。
    void OnSizeChanged(object sender, EventArgs e)
    {
if (this.WindowState == FormWindowState.Minimized)
        {
this.notifyIcon1.Visible = true;
this.Visible = false;
        }
    }

// 當雙擊托盤表徵圖時，恢複視窗顯示
    void OnNotifyIconDoubleClicked(object sender, EventArgs e)
    {
this.Visible = true;
this.notifyIcon1.Visible = false;
this.WindowState = FormWindowState.Normal;
    }

// 當收到第二個進程的通知時，顯示氣球訊息
    void OnProgramStarted(object state, bool timeout)
    {
this.notifyIcon1.ShowBalloonTip(2000, "Hello", "I am here...", ToolTipIcon.Info);
    }
}