Mutex myMutex = null;
//ensure that the app is not already running!
//this method will prevent duplicates, even if the user has
//changed the exe name. This method is more reliable than just
//checking for process name in the process list!
try
{
Console.WriteLine("Checking to see if app is already running...");
reeMutex = Mutex.OpenExisting( "myMutexName" );
//if we were able to open the mutex
//that means that it already existed
//which means that the app is already running
//which means we need to abaondon ship
Console.WriteLine( Process.GetCurrentProcess().MainModule.FileName + " is already running! Only a single MyApp can run at a time. This instance will shut down." );
return ;
}
catch( WaitHandleCannotBeOpenedException )
{
//This is the FIRST instantiation,
//which means that this is the first run of the app
//which means we can keep on running
//so go ahead and create the mutex
Console.WriteLine( "Mutex does not exist, creating..." );
bool mutexWasCreated = false;
reeMutex = new System.Threading.Mutex( true, mutexName, out mutexWasCreated );
}
catch( UnauthorizedAccessException )
{
//if there was a security access error
//that means that it already existed (even though we could't open it)
//which means that the appis already running
//which means we need to abaondon ship
Console.WriteLine( Process.GetCurrentProcess().MainModule.FileName + " is already running! Only a single MyApp can run at a time. This instance will shut down." );
return;
}
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