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  • 控制同一exe程序打开多次

    1.新建一个SingleInstance类:

    using System;
    using System.Collections.Generic;
    using System.Text;

    using System.Runtime.InteropServices;
    using System.Diagnostics;

    namespace NetChange
    {
        class SingleInstance
        {
            [DllImport("User32.dll")]
            private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
            [DllImport("User32.dll")]
            private static extern bool SetForegroundWindow(IntPtr hWnd);

            private const int WS_SHOWNORMAL = 1;

            public static Process GetRunningInstance()
            {
                Process currentProcess = Process.GetCurrentProcess();
                string currentFileName = currentProcess.MainModule.FileName;
                Process[] processes = Process.GetProcessesByName(currentProcess.ProcessName);
                foreach (Process process in processes)
                {
                    if (process.MainModule.FileName == currentFileName)
                    {
                        if (process.Id != currentProcess.Id)
                            return process;
                    }
                }
                return null;
            }


           public static bool HandleRunningInstance(Process instance)
           {

              ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL);
              return SetForegroundWindow(instance.MainWindowHandle);
           }


          public static bool HandleRunningInstance()
         {
            Process p = GetRunningInstance();
            if (p != null)
            {
                    HandleRunningInstance(p);
                    return true;
            }
            return false;
         }

        }  
    }
    2.在program.cs 修改代码如下:

    using System;
    using System.Collections.Generic;
    using System.Windows.Forms;

    namespace NetChange
    {
        static class Program
        {
            /// <summary>
            /// 应用程序的主入口点。
            /// </summary>
            [STAThread]
            static void Main()
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                //===定义SingleInstance类,实现应用运行唯一性判断==
                if (SingleInstance.HandleRunningInstance() == false)
                {
                    Application.Run(new Form1());
                }
                else {
                     Application.Exit();
                }
                //===========
                //Application.Run(new Form1());
            }
        }
    }

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  • 原文地址:https://www.cnblogs.com/zengwei/p/1923235.html
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