C#只允许启动一个WinFrom进程的两种方法

方法一：只禁止多个进程运行

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[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      
    }   
}  
[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 

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[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;  
[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; 

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