C# 只允许开启一个exe程序

第一种方法

电脑只能启动一次再次点击显示当前exe程序

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using System.Windows.Forms;namespace BulletinBoard
{static class Program{[DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]public static extern int SetForegroundWindow(IntPtr hwnd);[DllImport("user32.dll", EntryPoint = "SendMessage")]public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);public const int WM_SYSCOMMAND = 0x112;public const int SC_RESTORE = 0xF120;/// <summary>/// 应用程序的主入口点。/// </summary>[STAThread]static void Main(){Process cur = Process.GetCurrentProcess();foreach (Process p in Process.GetProcesses()){if (p.Id == cur.Id) continue;if (p.ProcessName == cur.ProcessName){SetForegroundWindow(p.MainWindowHandle);SendMessage(p.MainWindowHandle, WM_SYSCOMMAND, SC_RESTORE, 0);return;}}Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(new Form1());}}
}

第二种方法

电脑只能启动一次再次点击重新启动exe程序

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using System.Windows.Forms;namespace BulletinBoard
{static class Program{/// <summary>/// 应用程序的主入口点。/// </summary>[STAThread]static void Main(){Process current = Process.GetCurrentProcess();Process[] pp = Process.GetProcessesByName(current.ProcessName);foreach(Process p in pp){if (p.Id != current.Id){if (p.MainModule.FileName == current.MainModule.FileName){p.Kill();break;}}}Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(new Form1());}}
}