C # winform: judge whether the program is running and only one instance can be run

JudgmentProgramWhether the program is running or not. There are many methods to run only one instance. The following two methods are recorded,

Method 1: thread mutex

     Static   Class Program
{
 Private   Static System. Threading. mutex;

 ///   <Summary>  
  ///  The main entry point of the application.
  ///   </Summary>  
 [Stathread]
 Static   Void Main ()
{
Application. enablevisualstyles ();
Application. setcompatibletextrenderingdefault ( False );

Mutex = New System. Threading. mutex ( True , "  Onlyrun  " );
 If (Mutex. waitone (0 , False ))
{
Application. Run ( New Mainform ());
}
 Else 
{
MessageBox. Show ( "  The program is running!  " , "  Prompt  " , Messageboxbuttons. OK, messageboxicon. information );
Application. Exit ();
}
}
}

Method 2:

This method of detecting the process name is not absolutely effective. Because after opening the first instance, you can still run the second instance after renaming the running file.

     Static   Class Program
{
 ///   <Summary>  
  ///  The main entry point of the application.
  ///   </Summary>  
 [Stathread]
Static   Void Main ()
{
Application. enablevisualstyles ();
Application. setcompatibletextrenderingdefault ( False );

 //  Get the name of our process  
              String P = system. Diagnostics. process. getcurrentprocess (). processname;
 //  Get the list of all processes by that name  
 System. Diagnostics. Process [] processes = system. Diagnostics. process. getprocessesbyname (P );
 //  If there is more than one process  
              If (Processes. length> 1 )
{
MessageBox. Show ( "  The program is running.  " , "  System prompt  " , Messageboxbuttons. OK, messageboxicon. information );
Application. Exit ();
}
 Else 
{
Application. Run ( New Mainform ());
}
}
}