本文主要是介绍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，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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());}}
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