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();
System.Environment.Exit();
}
}
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 = ;
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);
}
}
}
}