WinForm应用只运行一次

static class Program

    {

        /// <summary>

        /// 应用程序的主入口点。

        /// </summary>

        [STAThread]

        static void Main()

        {

            bool createNew;

　　　　//Using System.Threading;

            using (Mutex m = new Mutex(true, Application.ProductName, out createNew))

            {

                if (createNew)

                {

                    Application.EnableVisualStyles();

                    Application.SetCompatibleTextRenderingDefault(false);

                    Application.Run(new Form1());

                }

                else

                {

                    MessageBox.Show("该程序己启动");

                }

            }

        }

    }

WinForm应用只运行一次

原文：http://www.cnblogs.com/cztaxlyh/p/5222045.html