C#程序多用户只启动一个进程的方法

Main函数

[STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            webscreenshot wb = new webscreenshot();
            Process current = Process.GetCurrentProcess();
            bool newinstance = true;
            Process[] processes = Process.GetProcessesByName(current.ProcessName);

            //遍历正在有相同名字运行的例程  
            foreach (Process process in processes)
            {
                //忽略现有的例程  
                if (process.Id != current.Id)
                {
                    //确保例程从EXE文件运行  
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
                    {
                        //返回另一个例程实例  
                        current = process;
                        newinstance = false;
                        break;
                    }
                }
            }
            if (newinstance)
            {
                Application.Run(wb);
            }
            else
            {
                ShowWindowAsync(current.MainWindowHandle, 1);

                //设置真实例程为foreground   window  
                SetForegroundWindow(current.MainWindowHandle);
            }
        }

引入这两个API函数

[DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(  IntPtr hWnd, int cmdShow);

        [DllImport("User32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
    }