WPF防止重复运行实例

1、方法一

在app.xaml.cs下添加如下代码：

 /// <summary>  
    /// App.xaml 的交互逻辑  
    /// </summary>  
    public partial class App : Application  
    {  
        System.Threading.Mutex mutex;  
  
        public App()  
        {  
            this.Startup += new StartupEventHandler(App_Startup);  
        }  
  
        void App_Startup(object sender, StartupEventArgs e)  
        {  
            bool ret;  
            mutex = new System.Threading.Mutex(true, "ElectronicNeedleTherapySystem", out ret);  
  
            if (!ret)  
            {  
                MessageBox.Show("已有一个程序实例运行");  
                Environment.Exit(0);  
            }  
  
        }  
    }  

　　二、方法二

1.通过查找process的方法来控制应用程序启动。
PS：这个方法有bug：在多用户登录后，只有一个用户可以正常启动程序，也就是说，进程是跨用户的。
[java] view plain copy
int processCount = Process.GetProcessesByName("windowWPF").Where(o => o.Id != Process.GetCurrentProcess().Id).Count();  
if (processCount > 1)  
    Environment.Exit(0);  
2. 注意mutex不能被回收，否则就无法发挥作用了。
[java] view plain copy
bool ret;    
using (System.Threading.Mutex  mutex = new System.Threading.Mutex(true, "WpfMuerterrrterterttex", out ret))    
{    
    if (!ret)    
        Environment.Exit(0);    
}    

　　

 

 /// <summary>
    /// App.xaml 的交互逻辑
    /// </summary>
    public partial class App : Application
    {
        System.Threading.Mutex mutex;

        public App()
        {
            this.Startup += new StartupEventHandler(App_Startup);
        }

        void App_Startup(object sender, StartupEventArgs e)
        {
            bool ret;
            mutex = new System.Threading.Mutex(true, "ElectronicNeedleTherapySystem", out ret);

            if (!ret)
            {
                MessageBox.Show("已有一个程序实例运行");
                Environment.Exit(0);
            }

        }
    }

 

三、方法三 已有程序窗体致前

 

        [DllImport("user32", CharSet = CharSet.Unicode)]
        static extern IntPtr FindWindow(string cls, string win);
        [DllImport("user32")]
        static extern IntPtr SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32")]
        static extern bool IsIconic(IntPtr hWnd);
        [DllImport("user32")]
        static extern bool OpenIcon(IntPtr hWnd);

 

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            mutex = new System.Threading.Mutex(true, "wpfdemo", out bool ret);
            if (!ret)
            {
                ActivateOtherWindow();
                //MessageBox.Show("程序已运行！");
                Environment.Exit(0);
            }
　　　　　}

        private static void ActivateOtherWindow()
        {
            //里面的文本改成自己程序窗口的标题
            //var other = FindWindow(null, "主页");
           var process= Process.GetProcessesByName("wpfexe").Where(o => o.Id != Process.GetCurrentProcess().Id).FirstOrDefault();
           var other= process.MainWindowHandle;
            if (other != IntPtr.Zero)
            {
                SetForegroundWindow(other);
                if (IsIconic(other))
                    OpenIcon(other);
            }
        }