???????????????????"????????????????"??????????. ????????????????ú???飬???????????????????????μ????????????????????????????????.
???????????????????????(??????????"A.exe")
????1.?????????????????.
????2.??A.exe????????????￡????A.exe?????????????A.exe????????????.
????3.????A.exe???????B.exe????A.exe????????????￡????B.exe?????A.exe????????????.
??????????????????????????????
????1.????

 

bool createdNew; Mutex instance
= new Mutex(true??"??????(??????????)"?? out
createdNew);
if
(createdNew)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new FormMain());
instance.ReleaseMutex();
}
else
{
MessageBox.Show("????????????????????????"?? "?????"?? MessageBoxButtons.OK??
MessageBoxIcon.Error);
Application.Exit();
}

????????:
????????????????????????????????ж???????????????????????????????????"????????????????????!".??????????????????????е???????????????????.?????????????:??????????????????(???????????????? ?????????????????????????????????????????????????м?!)
????2.Process??
?????????????????

 

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;
}