WPF 同一个程序 只允许 同时运行一个

 

 

 

 

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方法2  当程序已经运行了 再运行这个程序时，则显示当前这个窗体  http://code.3rbang.com/cshape-run-one/

VS2013附件：http://files.cnblogs.com/xe2011/WpfApplication_System.Threading.Mutex.rar

 

 

.NET 已经提供一个 类 System.Threading.Mutex 所以不采用API CreateMutex

在 App.xaml.cs 中实现代码,重这写 OnStartup

 

 

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Windows;

 

namespace WpfApplication7

{

    /// <summary>

    /// App.xaml 的交互逻辑

    /// </summary>

    public partial class App : Application

    {

        #region DllImport...

 

        [System.Runtime.InteropServices.DllImport("User32.dll")]

        private static extern bool SetForegroundWindow(IntPtr hWnd);

 

 

        [System.Runtime.InteropServices.DllImport("User32.dll")]

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

 

        private const int SW_SHOW = 1;

        #endregion

 

 

 

 

        bool createdNew;

        protected override void OnStartup(StartupEventArgs e)

        {

            System.Threading.Mutex mutex = new System.Threading.Mutex(true, "HelloRoman", out createdNew);

            if (!createdNew)

            {

                System.Diagnostics.Process progress1 = GetExistProcess();

                if (progress1 != null)

                {

                    ShowMainWindow(progress1);

                    Environment.Exit(0);

                }

 

            }

        }

 

 

        /// <summary>

        /// 最前端显示主窗体

        /// </summary>

        /// <param name="process"></param>

        private void ShowMainWindow(System.Diagnostics.Process process)

        {

            IntPtr mainWindowHandle1 = process.MainWindowHandle;

            if (mainWindowHandle1 != IntPtr.Zero)

            {

                ShowWindowAsync(mainWindowHandle1, SW_SHOW);

                SetForegroundWindow(mainWindowHandle1);

            }

        }

 

        /// <summary>

        /// 查看程序是否已经运行

        /// </summary>

        /// <returns></returns>

        private static System.Diagnostics.Process GetExistProcess()

        {

            System.Diagnostics.Process currentProcess = System.Diagnostics.Process.GetCurrentProcess();

            foreach (System.Diagnostics.Process process1 in System.Diagnostics.Process.GetProcessesByName(currentProcess.ProcessName))

            {

                if ((process1.Id != currentProcess.Id) &&

                     (System.Reflection.Assembly.GetExecutingAssembly().Location == currentProcess.MainModule.FileName))

                {

                    return process1;

                }

            }

            return null;

        }

 

 

    }

}

---

方法1

 

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Windows;

 

 

namespace WpfApplication6

{

 

 

 

 

    /// <summary>

    /// App.xaml 的交互逻辑

    /// </summary>

    public partial class App : Application

    {

 

        [System.Runtime.InteropServices.DllImport("kernel32.dll", EntryPoint = "CreateMutex")]

        public static extern IntPtr CreateMutex(int lpSecurityAttributes, bool bInitialOwner, string lpName);

 

        [System.Runtime.InteropServices.DllImport("kernel32.dll", EntryPoint = "GetLastError")]

        public static extern int GetLastError();

        private const int ERROR_ALREADY_EXISTS = 183;

 

 

 

 

        protected override void OnStartup(StartupEventArgs e)

        {

            string appTitle = "2014年5月31日7:28:29";

            IntPtr hMutex = CreateMutex(0, true, appTitle);

            if (GetLastError() == ERROR_ALREADY_EXISTS)

            {

                MessageBox.Show("程序已经运行！");

                Application.Current.Shutdown();

            }

        }

 

    }

}

 

来自为知笔记(Wiz)