Winform禁止程序多开 &&禁止多开且第二次激活第一次窗口

水深无声 2021-12-11 12:25 280阅读 0赞

一、禁止多开问题，运用Mutex锁

在Program.cs中运用Mutex锁

bool createNew;
    using (System.Threading.Mutex mutex = new System.Threading.Mutex(true, Application.ProductName, out createNew))
    {
         if (createNew)
         {
              Application.Run(new Form1());
         }
         else
         {
              MessageBox.Show("应用程序已经在运行中...")
              System.Threading.Thread.Sleep(1000);
              System.Environment.Exit(1);
         }
    }

或者

static void Main()
    {
         Application.EnableVisualStyles();
         Application.SetCompatibleTextRenderingDefault(false);
         //Application.Run(new MainForm());
    
          bool CreateNewForm;//返回是否赋予了使用线程的互斥体初始所属权 
          System.Threading.Mutex instance = new System.Threading.Mutex(true, "MutexName", out CreateNewForm);//同步基元变量 
          if (CreateNewForm)//赋予了线程初始所属权，也就是首次使用互斥体
          {
               Application.Run(new MainForm());
               instance.ReleaseMutex();
          }
          else
          {
               Application.Exit();
          }
    }

二、禁止多开且第二次点击激活第一次窗口运用句柄

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;
    using System.Diagnostics;
    using System.Reflection;
    
    namespace NetCardUI
    {
        static class Program
        {
            ///<summary>
            /// 该函数设置由不同线程产生的窗口的显示状态
            /// </summary>
            /// <param name="hWnd">窗口句柄</param>
            /// <param name="cmdShow">指定窗口如何显示。查看允许值列表，请查阅ShowWlndow函数的说明部分</param>
            /// <returns>如果函数原来可见，返回值为非零；如果函数原来被隐藏，返回值为零</returns>
            [DllImport("User32.dll")]
            private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
    
            /// <summary>
            ///  该函数将创建指定窗口的线程设置到前台，并且激活该窗口。键盘输入转向该窗口，并为用户改各种可视的记号。
            ///  系统给创建前台窗口的线程分配的权限稍高于其他线程。 
            /// </summary>
            /// <param name="hWnd">将被激活并被调入前台的窗口句柄</param>
            /// <returns>如果窗口设入了前台，返回值为非零；如果窗口未被设入前台，返回值为零</returns>
            [DllImport("User32.dll")]
            private static extern bool SetForegroundWindow(IntPtr hWnd);
    
            private const int SW_SHOWNOMAL = 1;
            private static void HandleRunningInstance(Process instance)
            {
                ShowWindowAsync(instance.MainWindowHandle, SW_SHOWNOMAL);//显示
                SetForegroundWindow(instance.MainWindowHandle);//设置到最前端
            }
            private static Process RuningInstance()
            {
                Process currentProcess = Process.GetCurrentProcess();
                Process[] Processes = Process.GetProcessesByName(currentProcess.ProcessName);
                foreach (Process process in Processes)
                {
                    if (process.Id != currentProcess.Id)
                    {
                        if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == currentProcess.MainModule.FileName)
                        {
                            return process;
                        }
                    }
                }
                return null;
            }
            /// <summary>
            /// 应用程序的主入口点。
            /// </summary>
            [STAThread]
            static void Main()
            {
                Process process = RuningInstance();
                if (process == null)
                {
                    Application.Run(new MainForm());
                }
                else
                {
                    HandleRunningInstance(process);
                    //System.Threading.Thread.Sleep(1000);
                    //System.Environment.Exit(1);
                }
            }
        }                
    }

转载于:https://www.cnblogs.com/javier520/p/10672729.html