只禁止多个进程运行

方法一：只禁止多个进程运行

[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。/n/n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;