DevExpress Winform使用单例运行程序方法和非DevExpress使用Mutex实现程序单实例运行且运行则激活窗体的方法

原文:DevExpress Winform使用单例运行程序方法和非DevExpress使用Mutex实现程序单实例运行且运行则激活窗体的方法

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本文链接：https://blog.csdn.net/u012097590/article/details/92806194

网上关于C#单例运行程序的方法都是比较简单，有些甚至是无法实现功能的，不知道他们试没试过就发帖，因为自己之前都是用第三方控件DevExpress，单例运行也是用它本身自带的一个方法，调用此方法需要引用DevExpress的DevExpress.DevAV.v17.1.Data.dll

static void Main()





        {





var appName= Process.GetCurrentProcess().ProcessName;





using (DevExpress.Internal.DevAVDataDirectoryHelper.SingleInstanceApplicationGuard(appName, out exit))





            {





                if (exit)





                    return;





                Application.EnableVisualStyles();





                Application.SetCompatibleTextRenderingDefault(false);





                Application.Run(new Form1());





            }





}

以前懒，看到有现成的就拿现成的，也没去想具体如何实现，刚好有人问起，才决定去看看源码，发现DevExpress的这个方法原来是用了Mutex来实现的，整合了一下资料，重新写一个供C#桌面应用程序通用的单例运行方法，代码如下：

其中需要引用以下命名空间:

using System;





using System.Diagnostics;





using System.Drawing;





using System.Runtime.InteropServices;





using System.Security;





using System.Threading;

/// <summary>





    /// 单实例应用程序--by涛神





    /// </summary>





    public class SingleInstanceApplication





    {





        /// <summary>





        /// 判断应用是否运行





        /// </summary>





        /// <param name="processName"></param>





        /// <param name="exit"></param>





        /// <returns></returns>





        public static IDisposable Guard(out bool exit)





        {





            Process currentProcess = Process.GetCurrentProcess();





            var processName = currentProcess.ProcessName;





            Mutex mutex = new Mutex(true, processName, out bool createNew);





            if (createNew)





            {





                exit = false;





            }





            else





            {





                Process[] processesByName = Process.GetProcessesByName(currentProcess.ProcessName);





                int num = 0;





                while (num < (int)processesByName.Length)





                {





                    Process process = processesByName[num];





                    if (process.Id == currentProcess.Id || !(process.MainWindowHandle != IntPtr.Zero))





                    {





                        num++;





                    }





                    else





                    {





                        WinApiHelper.SetForegroundWindow(process.MainWindowHandle);





                        WinApiHelper.RestoreWindowAsync(process.MainWindowHandle);





                        break;





                    }





                }





                exit = true;





            }





            return mutex;





        }





        private static class WinApiHelper





        {





            [SecuritySafeCritical]





            public static bool IsMaxmimized(IntPtr hwnd)





            {





                WinApiHelper.Import.WINDOWPLACEMENT wINDOWPLACEMENT = new WinApiHelper.Import.WINDOWPLACEMENT();





                if (!WinApiHelper.Import.GetWindowPlacement(hwnd, ref wINDOWPLACEMENT))





                {





                    return false;





                }





                return wINDOWPLACEMENT.showCmd == WinApiHelper.Import.ShowWindowCommands.ShowMaximized;





            }





 





            [SecuritySafeCritical]





            public static bool RestoreWindowAsync(IntPtr hwnd)





            {





                return WinApiHelper.Import.ShowWindowAsync(hwnd, (WinApiHelper.IsMaxmimized(hwnd) ? 3 : 9));





            }





 





            [SecuritySafeCritical]





            public static bool SetForegroundWindow(IntPtr hwnd)





            {





                return WinApiHelper.Import.SetForegroundWindow(hwnd);





            }





 





            private static class Import





            {





                [DllImport("user32.dll", CharSet = CharSet.None, ExactSpelling = false)]





                public static extern bool GetWindowPlacement(IntPtr hWnd, ref WinApiHelper.Import.WINDOWPLACEMENT lpwndpl);





 





                [DllImport("user32.dll", CharSet = CharSet.None, ExactSpelling = false)]





                public static extern bool SetForegroundWindow(IntPtr hWnd);





 





                [DllImport("user32.dll", CharSet = CharSet.None, ExactSpelling = false)]





                public static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);





 





                public enum ShowWindowCommands





                {





                    Hide,





                    Normal,





                    ShowMinimized,





                    ShowMaximized,





                    ShowNoActivate,





                    Show,





                    Minimize,





                    ShowMinNoActive,





                    ShowNA,





                    Restore,





                    ShowDefault,





                    ForceMinimize





                }





 





                public struct WINDOWPLACEMENT





                {





                    public int length;





 





                    public int flags;





 





                    public WinApiHelper.Import.ShowWindowCommands showCmd;





 





                    public Point ptMinPosition;





 





                    public Point ptMaxPosition;





 





                    public Rectangle rcNormalPosition;





                }





            }





        }





    }

调用的demo如下，亲测可以，若无法实现的请留言讨论（本文章是原创文章，转载请标明，盗版必究，觉得文章对你帮助的可以点个赞表示支持一下，谢谢）：

static void Main()





        {





            using(SingleInstanceApplication.Guard(out bool exit))





            {





                if (exit)





                    return;





                Application.EnableVisualStyles();





                Application.SetCompatibleTextRenderingDefault(false);





                Application.Run(new Form1());





            }





        }