• ?WPF?應(yīng)用程序的生存期會(huì)通過(guò) Application 引發(fā)的幾個(gè)事件來(lái)加以標(biāo)記，相關(guān)事件對(duì)應(yīng)著應(yīng)用程序何時(shí)啟動(dòng)、激活、停用和關(guān)閉。

應(yīng)用程序生存期事件

• ??獨(dú)立應(yīng)用程序(傳統(tǒng)風(fēng)格的 Windows 應(yīng)用程序，這些應(yīng)用程序作為要安裝到客戶端計(jì)算機(jī)并從客戶端計(jì)算機(jī)運(yùn)行的可執(zhí)行程序集來(lái)生成)和 XAML 瀏覽器應(yīng)用程序 (XBAP)(由導(dǎo)航頁(yè)組成的應(yīng)用程序，這些應(yīng)用程序作為可執(zhí)行程序集生成并由Web 瀏覽器托管) 的生存期并非完全相同。

• ??下圖展示了獨(dú)立應(yīng)用程序生存期內(nèi)的各個(gè)關(guān)鍵事件及其引發(fā)順序。

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?同樣的,下圖展示了 XAML 瀏覽器應(yīng)用程序 (XBAP)生存期內(nèi)的各個(gè)關(guān)鍵事件及其引發(fā)順序。

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創(chuàng)建WPF應(yīng)用程序并驗(yàn)證生存期相關(guān)事件

• ??在app.xmal中綁定相關(guān)事件以及啟動(dòng)設(shè)置Shutdown返回代碼模式

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// app.xanl 文件
// 綁定相關(guān)事件
<Application x:Class="WpfFirstApp.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfFirstApp"
             StartupUri="MainWindow.xaml"
             Startup="Application_Startup"
             Activated="Application_Activated"
             Deactivated="Application_Deactivated"
             DispatcherUnhandledException="App_DispatcherUnhandledException"
             Exit="Application_Exit"
             ShutdownMode="OnMainWindowClose">
    <Application.Resources>
         
    </Application.Resources>
</Application>

// App.xaml.cs 相關(guān)代碼
using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.Windows;
using System.Windows.Threading;

namespace WpfFirstApp
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        /// <summary>
        /// 啟動(dòng)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Application_Startup(object sender, StartupEventArgs e)
        {
            Debug.WriteLine("應(yīng)用啟動(dòng)了：Startup");

            //this.ShutdownMode = ShutdownMode.OnMainWindowClose;
        }

        /// <summary>
        /// 獲得焦點(diǎn)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Application_Activated(object sender, EventArgs e)
        {
            Debug.WriteLine("應(yīng)用獲得焦點(diǎn)了:Activated");
        }

        /// <summary>
        /// 失去焦點(diǎn)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Application_Deactivated(object sender, EventArgs e)
        {
            Debug.WriteLine("應(yīng)用失去焦點(diǎn)了:Deactivated");
        }

        /// <summary>
        /// 異常
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
        {
            Debug.WriteLine("應(yīng)用出現(xiàn)未處理的異常:DispatcherUnhandledException");

            //設(shè)置為已處理了異常
            e.Handled = true;
        }

        /// <summary>
        /// 退出
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Application_Exit(object sender, ExitEventArgs e)
        {
            Debug.WriteLine("程序關(guān)閉退出了：Exit");
        }
    }
}

//MainWindow.xaml.cs 相關(guān)代碼
// 按鈕里模擬相關(guān)處理
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfFirstApp
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Dispatcher.Invoke(() =>
            {
                throw new Exception("模擬異常");
                //throw new InvalidOperationException("模擬異常");
            });
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            Dispatcher.Invoke(() =>
            {
                Application.Current.Shutdown(9999);
            });
        }
    }
}

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