csharp winform 仅允许开启一个程序实例

设置之后,如果程序已经开启,将会阻止开启重复的程序, 并且唤醒当前程序

需要修改 Program.cs
原始代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;namespace apex_runner
{internal static class Program{/// <summary>/// 应用程序的主入口点。/// </summary>[STAThread]static void Main(){Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(new Form1());}}
}

修改后

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;namespace apex_runner
{internal static class Program{// 导入 Win32 API 用于设置前台窗口[DllImport("user32.dll")]private static extern bool SetForegroundWindow(IntPtr hWnd);[STAThread]static void Main(){// 使用互斥体确保只有一个实例运行bool isNewInstance;using (Mutex mutex = new Mutex(true, "MyUniqueAppName", out isNewInstance)){if (isNewInstance){/// <summary>/// 应用程序的主入口点。/// </summary>Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(new Form1());}else{// 找到已经运行的实例，并将其激活到前台Process currentProcess = Process.GetCurrentProcess();foreach (Process process in Process.GetProcessesByName(currentProcess.ProcessName)){if (process.Id != currentProcess.Id){SetForegroundWindow(process.MainWindowHandle);break;}}}}}}
}