用c# 如何实现一个winform 应用程序在一台电脑上只能打开一个

Question

用c# 如何实现一个winform 应用程序在一台电脑上只能打开一个

Answer 1

在开始的mian函数里面写
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
bool ret;
Mutex mutexConfig = new Mutex(true, Application.ProductName, out ret);
if (ret)
{}
else
{
2次启动
}

Answer 2

Mutex 是你自己编写的吗？？？？？还请详细点，谢谢了

Answer 3

using System.Threading;
系统带的

Answer 4

string procName = System.Diagnostics.Process.GetCurrentProcess().ProcessName; 
if((System.Diagnostics.Process.GetProcessesByName(procName)).GetUpperBound(0) >0) 
return true; 
else return false; true 说明已经运行了 退出就可以

Answer 5

using System;
using System.Collections.Generic;
using System.Windows.Forms;namespace WindowsApplication1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static int Main(string[] args)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            if (runone())
            Application.Run(new Form2());
        return 1;
        }
        private static System.Threading.Mutex mutex;
        private static bool runone()
        {
            bool one;
            mutex = new System.Threading.Mutex(true, "WindowsApplication2", out   one);
            return one;
        }
    }
}

Answer 6

static class Program
    {
        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
        [DllImport("User32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
        enum ShowWindowConstants
        {
            SW_HIDE = 0,
            SW_SHOWNORMAL = 1,
            SW_NORMAL = 1,
            SW_SHOWMINIMIZED = 2,
            SW_SHOWMAXIMIZED = 3,
            SW_MAXIMIZE = 3,
            SW_SHOWNOACTIVATE = 4,
            SW_SHOW = 5,
            SW_MINIMIZE = 6,
            SW_SHOWMINNOACTIVE = 7,
            SW_SHOWNA = 8,
            SW_RESTORE = 9,
            SW_SHOWDEFAULT = 10,
            SW_FORCEMINIMIZE = 11,
            SW_MAX = 11
        }
        
        public static Process RunningInstance()
        {
            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName(current.ProcessName);            //Loop through the running processes in with the same name
            foreach (Process process in processes)
            {
                //Ignore the current process
                if (process.Id != current.Id)
                {
                    //Make sure that the process is running from the exe file.
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") ==
                        current.MainModule.FileName)
                    {
                        //Return the other process instance.
                        return process;
                    }
                }
            }            //No other instance was found, return null.
            return null;
        }
        public static void HandleRunningInstance(Process instance)
        {
            //Make sure the window is not minimized or maximized
            ShowWindowAsync(instance.MainWindowHandle, (int)ShowWindowConstants.SW_RESTORE);            //Set the real intance to foreground window
            SetForegroundWindow(instance.MainWindowHandle);
        }        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(true);            Process instance = RunningInstance();
            if (instance == null)
            {
                Application.Run(new MainForm());
            }
            else
            {
                HandleRunningInstance(instance);
            }        }
    }