Run the application in singleton Mode

Apply Program Run in singleton Mode

Zhou yinhui

Take notes with little experience:

Public   Partial   Class APP: Application
{
Public APP ()
{
// It may not be necessary to select a reasonable time for your application to start up.
Startup + = Appstartup;
}

Void Appstartup ( Object Sender, startupeventargs E)
{
Bool Createnew;
VaR mutex =   New Mutex ( True , " Theidofthismutex " , Out Createnew );

If ( ! Createnew)
{
MessageBox. Show ( " Another instance is running " );
// Remember to close mutex before closing the program. Otherwise, the process may not exit.
Mutex. Close ();
// You do not have to call the shutdown method. Select an exit method suitable for your application.
Shutdown ();
}
Else
{
// Remember to close mutex when the program Exits normally.
Exit + =   Delegate {Mutex. Close ();};
}
}
}