C# .NET WINFORM MUTEX

static class Program 里的全局变量：

static System.Threading.Mutex appMutex;

Main 方法里的内容：

string exeName = "OfflineServer";
            string globalMutexName = @"Global\" + exeName;
            string appName = "服务程序";

            bool createNew;
            appMutex = new System.Threading.Mutex(true, globalMutexName, out createNew);
            if (!createNew)
            {
                appMutex.Close(); appMutex = null;
                MessageBox.Show(appName + "已开启，进程为" + exeName + "！", "提示");
                return;
            }

Application.ApplicationExit += new EventHandler(OnApplicationExit);

static class Program 里的全其它方法：

 static void OnApplicationExit(object sender, EventArgs e)
        {
            RelMutex();
        }

        /// <summary>
        /// 释放
        /// </summary>
        public static void RelMutex()
        {
            try
            {
                if (appMutex != null)
                {
                    appMutex.ReleaseMutex();
                    appMutex.Close();
                }
            }
            catch (Exception expMu) { }
        }

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