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  • C#只允许启动一个WinFrom进程

     

     
    [STAThread]
    public static void Main()
    {
        bool ret;
        System.Threading.Mutex mutex = new System.Threading.Mutex(true, Application.ProductName, out ret);
        if (ret)
        {
            System.Windows.Forms.Application.EnableVisualStyles();   //这两行实现   XP   可视风格   
            System.Windows.Forms.Application.DoEvents();
            System.Windows.Forms.Application.Run(new Main());
            //   Main   为你程序的主窗体,如果是控制台程序不用这句   
            mutex.ReleaseMutex();
        }
        else
        {
            MessageBox.Show(null, "有一个和本程序相同的应用程序已经在运行,请不要同时运行多个本程序。
    
    这个程序即将退出。", Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Warning);
            //   提示信息,可以删除。   
            Application.Exit();//退出程序   
        }
    }

    方法二:禁止多个进程运行,并当重复运行时激活以前的进程

    [STAThread]
    public static void Main()
    {
        //Get   the   running   instance.   
        Process instance = RunningInstance();
        if (instance == null)
        {
            System.Windows.Forms.Application.EnableVisualStyles();   //这两行实现   XP   可视风格   
            System.Windows.Forms.Application.DoEvents();
            //There   isn't   another   instance,   show   our   form.   
            Application.Run(new Main());
        }
        else
        {
            //There   is   another   instance   of   this   process.   
            HandleRunningInstance(instance);
        }
    }
    public static Process RunningInstance()
    {
        Process current = Process.GetCurrentProcess();
        Process[] processes = Process.GetProcessesByName(current.ProcessName);
        //Loop   through   the   running   processes   in   with   the   same   name   
        foreach (Process process in processes)
        {
            //Ignore   the   current   process   
            if (process.Id != current.Id)
            {
                //Make   sure   that   the   process   is   running   from   the   exe   file.   
                if (Assembly.GetExecutingAssembly().Location.Replace("/", "\") == current.MainModule.FileName)
                {
                    //Return   the   other   process   instance.   
                    return process;
                }
            }
        }
        //No   other   instance   was   found,   return   null. 
        return null;
    }
    
    public static void HandleRunningInstance(Process instance)
    {
        //Make   sure   the   window   is   not   minimized   or   maximized   
        ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL);
        //Set   the   real   intance   to   foreground   window
        SetForegroundWindow(instance.MainWindowHandle);
    }
    
    [DllImport("User32.dll")]
    private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
    
    [DllImport("User32.dll")]
    private static extern bool SetForegroundWindow(IntPtr hWnd);
    
    private const int WS_SHOWNORMAL = 1;


    引用:https://www.cnblogs.com/lidj/archive/2012/07/06/2579897.html
    HK
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  • 原文地址:https://www.cnblogs.com/HarryK4952/p/14802998.html
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