C#只允许启动一个WinFrom进程

 

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。\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;