引用自：http://www.hanselman.com/blog/TheWeeklySourceCode31SingleInstanceWinFormsAndMicrosoftVisualBasicdll.aspx

 

using

System;

using

System.Windows.Forms;

using

Microsoft.VisualBasic.ApplicationServices;

 

namespace

SuperSingleInstance

{

    

static

class

Program

    

{

        

[STAThread]

        

static

void

Main()

        

{

            

Application.EnableVisualStyles();

            

Application.SetCompatibleTextRenderingDefault(

false

);

            

string

[] args = Environment.GetCommandLineArgs();

            

SingleInstanceController controller =

new

SingleInstanceController();

            

controller.Run(args);

        

}

    

}

 

    

public

class

SingleInstanceController : WindowsFormsApplicationBase

    

{

        

public

SingleInstanceController()

        

{

            

IsSingleInstance =

true

;

 

            

StartupNextInstance += this_StartupNextInstance;

        

}

 

        

void

this_StartupNextInstance(

object

sender, StartupNextInstanceEventArgs e)

        

{

            

Form1 form = MainForm

as

Form1;

//My derived form type

            

form.LoadFile(e.CommandLine[1]);

        

}

 

        

protected

override

void

OnCreateMainForm()

        

{

            

MainForm =

new

Form1();

        

}

    

}

}