C# 使用Win32库函数，确保Exe运行一个的做法

        /// 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_MAXIMIZE = 3;

        private static void HandleRunningInstance(Process instance)

        {

            ShowWindowAsync(instance.MainWindowHandle, SW_MAXIMIZE);//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;

        }

 

 

运行代码：

using System.Diagnostics;
using System.Reflection;

        static void Main(string[] args)
        {
   
   //防止软件二次开启
   Process process = RuningInstance();

            if (process != null)

            {

                MessageBox.Show("应用程序已经在运行中。。。");

                HandleRunningInstance(process);
                System.Environment.Exit(1);

            }
            //
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MainFram(args));
        }