一、保证只有一个进程

1.1 关闭旧的，打开新的

   protected override void OnStartup(StartupEventArgs e) {base.OnStartup(e);var process =Process.GetProcessesByName("Dog");if (process.Count() > 1) {var list = process.ToList();list.Sort((p1,p2)=>p1.StartTime.CompareTo(p2.StartTime));list[0].Kill();}}

1.2 程序打开后不再打开新程序

 protected override void OnStartup(StartupEventArgs e) {base.OnStartup(e);var process =Process.GetProcessesByName("Dog");if (process.Count() > 1) {MessageBox.Show("已经打开一个程序");Process.GetCurrentProcess().Kill();}}

二、异常捕捉

   public App(){//注册全局事件AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;DispatcherUnhandledException += App_DispatcherUnhandledException;TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;}private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs args){const string msg = "主线程异常";try{if (args.ExceptionObject is Exception && Dispatcher != null){Dispatcher.Invoke(() =>{Exception ex = (Exception)args.ExceptionObject;HandleException(msg, ex);});}}catch (Exception ex){HandleException(msg, ex);}}private void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs args){const string msg = "子线程异常";try{HandleException(msg, args.Exception);args.Handled = true;}catch (Exception ex){HandleException(msg, ex);}}private void TaskScheduler_UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs args){const string msg = "异步异常";try{HandleException(msg, args.Exception);args.SetObserved();}catch (Exception ex){HandleException(msg, ex);}}private void HandleException(string msg, Exception ex){MessageBox.Show(ex.Message,msg);}