Windows Phone開發之App文件講解

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;

namespace MicroBlogForWP7
{
    public partial class App : Application
    {
        public PhoneApplicationFrame RootFrame { get; private set; }

        /// <summary>
        /// 構造應用程序的對象
        /// </summary>
        public App()
        {
            //執行未處理的異常
            UnhandledException += Application_UnhandledException;

            //初始化Silverlight
            InitializeComponent();

            //應用程序特定的初始化
            InitializePhoneApplication();

            //調試顯示的視圖化信息
            if (System.Diagnostics.Debugger.IsAttached)
            {
                //顯示當前的幀速率計數器。
                Application.Current.Host.Settings.EnableFrameRateCounter = false;

                //顯示應用程序正在在每個幀重繪的區域。
                Application.Current.Host.Settings.EnableRedrawRegions = false;

                //允許非生產分析的可視化模式，
                //這表明，交給了一個彩色套印到GPU的頁面區域。
                Application.Current.Host.Settings.EnableCacheVisualization = false;

                //禁用應用空閒檢測，由設置的UserIdleDetectionMode屬性
                //應用的PhoneApplicationService對象爲Disabled。
                //注意： - 這只是調試模式下使用。禁用用戶空閒檢測的應用程序將繼續運行
                //和消耗電池電量，當用戶不使用手機。
                PhoneApplicationService.Current.UserIdleDetectionMode = IdleDetectionMode.Disabled;
            }

        }

        //要執行的代碼應用程序啓動時（例如，從“開始”)
        private void Application_Launching(object sender, LaunchingEventArgs e)
        {

        }

        //要執行的代碼的應用程序被激活時（回到應用程序激活狀態）
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {

        }

        //應用程序關閉時要執行的代碼（後臺運行失去激活）
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {

        }

        //代碼執行應用程序時關閉（例如，用戶關閉）
        private void Application_Closing(object sender, ClosingEventArgs e)
        {

        }

        //如果導航失敗
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                System.Diagnostics.Debugger.Break();
            }
        }

        //執行未處理的異常
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                System.Diagnostics.Debugger.Break();
            }
        }

        #region Phone application initialization

        //避免重複初始化
        private bool phoneApplicationInitialized = false;

        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            RootFrame = new PhoneApplicationFrame();
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            //處理導航故障
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            //確保不再次進行初始化
            phoneApplicationInitialized = true;
        }

        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            //設置根視覺，以允許應用程序來呈現
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            //不再需要時刪除此處理程序
            RootFrame.Navigated -= CompleteInitializePhoneApplication;
        }

        #endregion
    }
}