首先我要做的效果如下

思路一：page

在WP里Page是最基本的东西，你第一想法肯定是用Page来做登录注册。但是登录注册其实是不太适合用Page来做，关于login screen/splash screen的分析，且看这篇著名博文Introducing the concept of “Places”，在看完后想想用popup来做.登录注册页面在很多地方会被调用到，使用page会导致页面间跳转逻辑比较乱。

思路二：popup

popup只是个容器，设置Child为什么都可以，然后IsOpen=true;就显示出来了。

问题一：popup的Child可以是page吗？

答案是可以的。

signInUpPopup = new Popup();
//SignInUp为Page，改造过了
Guanjia.Views.SignInUp signInUp = new Guanjia.Views.SignInUp(this, signInUpPopup, 480, 728, 0);//this);
//这个不用解释了
signInUpPopup.Child = signInUp;
signInUpPopup.IsOpen = true;

然后更多问题出来了。

问题二：

当按下BackKey键的时候，Popup出来的页面连同父Page全部关掉了，不是我们期望的Popup消失的效果。所以要处理下。

private void doSignInUp(){signInUpPopup = new Popup();//SignInUp为Page，改造过了Guanjia.Views.SignInUp signInUp = new Guanjia.Views.SignInUp(this, signInUpPopup, 480, 728, 0);//this);//登录注册成功后回调了signInUp.OnSuccess += new EventHandler(signInUp_OnSuccess);//这个不用解释了signInUpPopup.Child = signInUp;//一下三行处理BackKey冲突signInUpPopup.Loaded += new RoutedEventHandler(signInUpPopup_Loaded);signInUpPopup.Unloaded += new RoutedEventHandler(signInUpPopup_Unloaded);signInUpPopup.Closed += new EventHandler(signInUpPopup_Closed);signInUpPopup.IsOpen = true;}

void signInUpPopup_Unloaded(object sender, RoutedEventArgs e){//草草草 没被调用Debug.WriteLine("Popup Unloaded here");this.BackKeyPress += Main_BackKeyPress;}public void AddBackKeyPressHandle(){this.BackKeyPress += Main_BackKeyPress;}void signInUpPopup_Loaded(object sender, RoutedEventArgs e){this.BackKeyPress -= Main_BackKeyPress;}void signInUpPopup_Closed(object sender, EventArgs e){Debug.WriteLine("Popup closed here");this.BackKeyPress += Main_BackKeyPress;}void signInUpPopup_Opened(object sender, EventArgs e){this.BackKeyPress -= Main_BackKeyPress;}

问题三：Popup出来的Page的ApplicationBar不对(在父Page里我没设ApplicationBar，所以popup出来也没有 ApplicationBar)，popup出来的page可以有ApplicationBar吗？我跑到stackoverflow一问： Is it possible to popup a sigin/up page(pivot) with appbar?。得到答案可以。

以下为改造过的登录页面

public partial class SignInUp : PhoneApplicationPage{private PhoneApplicationPage page = null;private IApplicationBar parentAppBar = null;private Popup popup = null;//public static event EventHandler OnSuccess;public SignInUp(){InitializeComponent();page = this;}public SignInUp(PhoneApplicationPage parentpage, Popup popup, int width, int height, int selectedIndex = 0){InitializeComponent();page = parentpage;this.popup = popup;this.Height = height;this.Width = width;//SignInUpPivot.SelectedIndex = selectedIndex;parentAppBar = parentpage.ApplicationBar;this.Loaded += (s, e) =>{page.BackKeyPress += page_BackKeyPress;};this.Unloaded += (s, e) =>{page.ApplicationBar = parentAppBar;page.BackKeyPress -= page_BackKeyPress;};}void page_BackKeyPress(object sender, System.ComponentModel.CancelEventArgs e){popup.IsOpen = false;e.Cancel = true;}

private void Pivot_SelectionChanged(object sender, SelectionChangedEventArgs e){int selectedIndex = (sender as Pivot).SelectedIndex;if (selectedIndex == 0){page.ApplicationBar = (Microsoft.Phone.Shell.ApplicationBar)Resources["SignInAppbar"];}else if (selectedIndex == 1){page.ApplicationBar = (Microsoft.Phone.Shell.ApplicationBar)Resources["SignUpAppbar"];}}

问题4:无法使用Code4Fun toolkit里的ToastPrompt来进行提示。网上一搜，c4f的开发者说ToastPrompt是所在层级与popup不一样（在popup之下，page之上），看了一下源码它使用了自己实现的popup来实现ToastPrompt。把c4f里的ToastPrompt改造成使用的Popup来实现，效果不好，但总算能显示在弹出来的东西之上，效果不好。

问题5：注册页里的TextBox会被弹出来的键盘遮住，不能像page那样自动向上移动。同样有人问了这样的问题：

http://webcache.googleusercontent.com/search?q=cache:aGfMs1FXRZcJ:forums.create.msdn.com/forums/t/74943.aspx+wp7+textbox+in+popup+keyboard&cd=5&hl=zh-TW&ct=clnk&gl=hk

这个真心没找到解决方案。

可见Popup来实现缺点太多。

思路三：还是用Page，只有一个问题：如何在登录成功后执行/通知前一个页面，执行一些操作，更新UI等?

解决方法：

1在SignInUp页里加一个可以登录注册成功事件，以便前一个页面添加回调

public partial class SignInUp : PhoneApplicationPage{//回调public static event EventHandler OnSuccess;public SignInUp(){InitializeComponent();}

2登录注册成功后调用OnSuccess

XXXService.Login(username, password, delegate(int loginResult){switch (loginResult){case 1://登录成功//Main.ToastMessage = "登录成功";App.CurrentAccount = new Account{Username = username,Password = password,};if (AutoSignInCheckBox.IsChecked == true){GuanjiaPersistentUserDatas.Account = App.CurrentAccount;}//调用回调if (OnSuccess != null){OnSuccess(null, null);}this.NavigationService.GoBack();//do something herebreak;case -1:ToastHelper.GetBasicToast("用户密码错误", "登录失败").Show();break;case -2:ToastHelper.GetBasicToast("用户不存在", "登录失败").Show();break;default:break;}},

3在父页面中只需在navigation到SignInUp.xaml前多一个步骤

private void doSignInUp(){SignInUp.OnSuccess += new EventHandler(signInUp_OnSuccess);NavigationService.Navigate(new Uri("/Views/SignInUp.xaml?Action=SignIn", UriKind.Relative));}

DONE!