应用程序的主入口点

 

 //返回是否赋予了使用线程的互斥体初始所属权
            Boolean createdNew;
            Mutex instance = new Mutex(true, "MutexName", out createdNew);
            //赋予了线程初始所属权，也就是首次使用互斥体
            if (createdNew)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Form1());
                instance.ReleaseMutex();
                Environment.Exit(0);
            }
            else
            {
                MessageBox.Show("已经启动了一个程序，请先退出！", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Application.Exit();
            }

            ////当<=1时 只能打开一个实例
            //if (System.Diagnostics.Process.GetProcessesByName(System.Diagnostics.Process.GetCurrentProcess().ProcessName).Length <= 1)
            //{
            //    Application.EnableVisualStyles();
            //    Application.SetCompatibleTextRenderingDefault(false);
            //    Application.Run(new Form1());
            //    Environment.Exit(0);
            //}
            //else
            //{
            //    //MessageBox.Show("程序已经打开！");
            //}