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[ASP.net教程]Winform防止程序重复运行


    需求:点击“关闭”按钮时,程序最小化到托盘,并没有退出,这时再次运行程序,不会重复起动,而是显示已运行的程序。

代码:

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Windows.Forms;using Tool;using System.Diagnostics;using System.Reflection;using System.Runtime.InteropServices;namespace 计算器{  static class Program  {    [DllImport("user32.dll")]    public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);    /// <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 ShowWindow(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_SHOWNORMAL = 1;    /// <summary>    /// 应用程序的主入口点。    /// </summary>    [STAThread]    static void Main()    {      Application.EnableVisualStyles();      Application.SetCompatibleTextRenderingDefault(false);      Process processes = RunningInstance();      if (processes == null)      {        Application.Run(new Form1());      }      else      {        HandleRunningInstance(processes);      }    }    /// <summary>    /// 获取正在运行的实例,没有运行的实例返回null;    /// </summary>    public static Process RunningInstance()    {      Process current = Process.GetCurrentProcess();      Process[] processes = Process.GetProcessesByName(current.ProcessName);      foreach (Process process in processes)      {        if (process.Id != current.Id)        {          if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)          {            return process;          }        }      }      return null;    }    /// <summary>    /// 显示已运行的程序。    /// </summary>    public static void HandleRunningInstance(Process instance)    {      try      {        IntPtr formHwnd = FindWindow(null, "计算器");        ShowWindow(formHwnd, SW_SHOWNORMAL);  //显示        SetForegroundWindow(formHwnd);     //放到前端      }      catch (Exception ex)      {        MessageBox.Show(ex.Message);      }    }  }}

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