检查是否本程序已经在运行

 看到一小段代码，记下来，也许以后有用

        private static void CheckRunning()

        {

            bool newMutexCreated = true;

            using (new Mutex(true, Assembly.GetExecutingAssembly().FullName, out newMutexCreated))

            {

                if (!newMutexCreated)

                {

                    MessageBox.Show("该程序已经被运行");

                    return;

                }

            }

        }