C#程序最小到系统托盘恢复的问题

Question

我的需求是这个程序只能运行一次，在第二次运行时要检测是否已经运行，如果已经运行则将先前运行的实例弹出到前面。现在的问题是这个程序使用了NotifyIcon控件最小化到了系统托盘区，现在的代码却无法恢复了。如果是正常的窗口（即不是最小化到系统托盘的）可以实现这个需求。代码如下：        [DllImport("user32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32.dll")]
        private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
        [DllImport("user32.dll")]
        private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
        [DllImport("user32.dll")]
        private static extern bool IsIconic(IntPtr hWnd);
        private const int SW_RESTORE = 9;
        private const int SW_SHOWNORMAL = 10;        private static Process OnlyPrograme2()
        {
            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName(current.ProcessName);            foreach (Process process in processes)
            {
                if (process.Id == current.Id)
                {
                    /*string str1 = Assembly.GetExecutingAssembly().Location;
                    string str2 = current.MainModule.FileName;
                    string str3 = process.MainModule.FileName;
                    MessageBox.Show("Assembly:" + str1
                        + "\ncurrent:" + str2
                        + "\nprocess:" + str3);*/                    //if (Assembly.GetExecutingAssembly().Location.Replace("/", "//")
                    //    == current.MainModule.FileName)
                    //{
                        
                        IntPtr hWnd = process.MainWindowHandle;
                        if (IsIconic(hWnd))
                            ShowWindowAsync(hWnd, SW_RESTORE);
                        ShowWindowAsync(hWnd, SW_RESTORE);
                        ShowWindow(hWnd, SW_SHOWNORMAL);
                        SetForegroundWindow(hWnd);
                        return process;
                    //}
                }
            }
            return null;
        }        private void FormMain_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.Hide();
            }
        }

Answer 1

 static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [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
            if (!createNew)
            {
                // 先写一些数据到注册表中，以便传递给前一个运行实例
                Registry.SetValue(@"HKEY_CURRENT_USER\Software\MyMy", "", "Your system " + DateTime.Now.ToLongTimeString());                // 发事件通知
                ProgramStarted.Set();                // 等一小会以便前一个运行实例接到通知后恢复显示（也可以采用等待事件通知的方式）
                Thread.Sleep(200);                // 将焦点转移到前一个实例
                foreach (Process p in Process.GetProcessesByName(Process.GetCurrentProcess().ProcessName))
                {
                    if (p.MainWindowHandle != IntPtr.Zero)
                    {
                        SetForegroundWindow(p.MainWindowHandle);
                    }
                }                // 就此退出第二个进程
                return;
            }            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new frmMain());
        }        public static EventWaitHandle ProgramStarted;        [System.Runtime.InteropServices.DllImport("user32.dll")]
        static extern bool SetForegroundWindow(IntPtr hWnd);
    }

Answer 2

问题是这个程序使用了NotifyIcon控件最小化到了系统托盘区
这段代码并不使其恢复啊