转C# 只能运行一个winForm进程

using System;

using System.Collections.Generic;

using System.Linq;

using System.Windows.Forms;

using System.Diagnostics;

using System.Runtime.InteropServices;

using System.Reflection;

namespace OnlyProcess

{

    static class Program

    {

        [STAThread]

        static void Main()

        {

            MessageBox.Show("ddddd");

            Process instance = RunningInstance();

            if (instance == null)

            {

                System.Windows.Forms.Application.EnableVisualStyles();    //这两行可以让窗体具有XP风格.

                System.Windows.Forms.Application.DoEvents();

                Application.Run(new Form1());

            }

            else

            {

                HandleRunningInstance(instance);

            }

        }

 

        #region   只运行一个实例

        public static Process RunningInstance()

        {

            Process current = Process.GetCurrentProcess();//当前新启动的线程

            Process[] processes = Process.GetProcessesByName(current.ProcessName);

            //遍历与当前进程名称相同的进程列表

            foreach (Process process in processes)

            {

                //process,原来旧的线程与当前新启动的线程ID不一样

                //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;//返回原来旧线程的窗体

                    }

                }

            }

            return null;

        }

        private static void HandleRunningInstance(Process instance)

        {

            MessageBox.Show("该应用系统已经在运行！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);

            ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL); //调用api函数，正常显示窗口

            SetForegroundWindow(instance.MainWindowHandle); //将窗口放置最前端。

        }

        [DllImport("User32.dll")]

        private static extern bool ShowWindowAsync(System.IntPtr hWnd, int cmdShow);

        [DllImport("User32.dll")]

        private static extern bool SetForegroundWindow(System.IntPtr hWnd);

        private const int WS_SHOWNORMAL = 1;

        #endregion

    }

}

 

 

 

//namespace OnlyProcess

//{

//    static class Program

//    {

//        /// <summary>

//        /// 应用程序的主入口点。

//        /// </summary>

//        [STAThread]

//        static void Main()

//        {

//            //get the name of our process

//            string proc = Process.GetCurrentProcess().ProcessName;

//            //get the list of all processes by that name

//            Process[] processes = Process.GetProcessesByName(proc);

//            //if there is more than one process

//            if (processes.Length > 1)

//            {

//                DialogResult dr = MessageBox.Show("Application is already running! Are you sure want to run another?", "INFORMATION", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);

 

//                if (dr == DialogResult.OK)

//                {

//                    Application.EnableVisualStyles();

//                    Application.SetCompatibleTextRenderingDefault(false);

//                    Application.Run(new Form1());

//                }

//            }

//            else

//            {

//                Application.EnableVisualStyles();

//                Application.SetCompatibleTextRenderingDefault(false);

//                Application.Run(new Form1());

//            }

//        }

//    }

//}

 

 

C# 创建互斥进程(程序) 互斥进程(程序), 简单点说,就是在系统中只能有该程序的一个实例运行. 现在很多软件都有这功能,如Maxthon 可以设置为"只允许打开一个窗体",还有Bitcomet等. 我也是看到这些软件的这个功能才来研究这个问题的. 要实现程序的互斥,通常有4中方式,下面用 C# 语言来实现:

实现方式一: 使用线程互斥变量. 通过定义互斥变量来判断是否已运行实例.C#实现如下:

把program.cs文件里的Main()函数改为如下代码:

static void Main()

{

bool runone;

System.Threading.Mutex run = new System.Threading.Mutex(true, "jiaao_test", out runone);

if (runone)

{

run.ReleaseMutex();

Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false);

Application.Run(new Form1());

}

else

{ MessageBox.Show("已经运行了一个实例了。");

}

}