窗体运行前，检查是否互斥

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using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Threading;using System.Runtime.InteropServices;using System.Diagnostics;using System.Reflection;namespace WindowsFormsApplication1{    static class Program    {        /// 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);        /// <summary>        /// 应用程序的主入口点。        /// </summary>        [STAThread]        static void Main()        {            Application.EnableVisualStyles();            Application.SetCompatibleTextRenderingDefault(false);            Process process = RuningInstance();            if (process == null)            {                Application.Run(new Form1());            }            else            {                HandleRunningInstance(process);//将窗体置于所有窗体前端            }                  }        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;        }    }}
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