C#程序只允许运行一个实例

一、使用用互斥量(System.Threading.Mutex)

 同步基元,它只向一个线程授予对共享资源的独占访问权。在程序启动时候,请求一个互斥体,如果能获取对指定互斥的访问权,就职运行一个实例

bool createNew;
            using (System.Threading.Mutex mutex = new System.Threading.Mutex(true, Application.ProductName, out createNew))
            {
                if (createNew)
                {
                    Application.Run(new Form1());
                }
                else
                {
                    MessageBox.Show("应用程序已经在运行中...")
                    System.Threading.Thread.Sleep(1000);
                    System.Environment.Exit(1);
                }
            }

二、使用进程名

Process[] processes = System.Diagnostics.Process.GetProcessesByName(Application.CompanyName);
            if (processes.Length > 1)
            {
                MessageBox.Show("应用程序已经在运行中。。");
                Thread.Sleep(1000);
                System.Environment.Exit(1);
            }
            else
            {
                Application.Run(new Form1());
            }

三、调用Win32 API,并激活并程序的窗口,显示在最前端

/// 该函数设置由不同线程产生的窗口的显示状态
        /// </summary>
        /// <param name="hWnd">窗口句柄</param>
        /// <param name="cmdShow">指定窗口如何显示。查看允许值列表,请查阅ShowWlndow函数的说明部分</param>
        /// <returns>如果函数原来可见,返回值为非零;如果函数原来被隐藏,返回值为零</returns>
        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
        /// <summary>
        ///  该函数将创建指定窗口的线程设置到前台,并且激活该窗口。键盘输入转向该窗口,并为用户改各种可视的记号。
        ///  系统给创建前台窗口的线程分配的权限稍高于其他线程。 
        /// </summary>
        /// <param name="hWnd">将被激活并被调入前台的窗口句柄</param>
        /// <returns>如果窗口设入了前台,返回值为非零;如果窗口未被设入前台,返回值为零</returns>
        [DllImport("User32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
private const int SW_SHOWNOMAL = 1;
        private static void HandleRunningInstance(Process instance)
        {
            ShowWindowAsync(instance.MainWindowHandle, SW_SHOWNOMAL);//显示
            SetForegroundWindow(instance.MainWindowHandle);//当到最前端
        }
        private static Process RuningInstance()
        {
            Process currentProcess = Process.GetCurrentProcess();
            Process[] Processes = Process.GetProcessesByName(currentProcess.ProcessName);
            foreach (Process process in Processes)
            {
                if (process.Id != currentProcess.Id)
                {
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == currentProcess.MainModule.FileName)
                    {
                        return process;
                    }
                }
            }
            return null;
        }
 Process process = RuningInstance();
            if (process == null)
            {
                Application.Run(new Form1());
            }
            else
            {
                MessageBox.Show("应用程序已经在运行中。。。");
                HandleRunningInstance(process);
                //System.Threading.Thread.Sleep(1000);
                //System.Environment.Exit(1);
            }
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