Windows Phone - 返回键

Windows Phone应用程序需要符合一些列的Guidelines，其中"返回键"是一个容易出问题的地方。

<<UI Design and Intercation Guide for Windows Phone 7>> v2.0中这样描述：
The hardware Back Button is used to navigate back _disibledevent=>See the Navigation, Frames, and Pages topic for more information about the page navigation model in Windows Phone 7.
When a user navigates back out of the root page of an application, the application will terminate.
The Back Button will not work as a backspace key to delete text input.
 
 
See the Navigation, Frames and Pages topic for additional guidance.
Developers should _disibledevent=>The hardware Back button is used to go back within an application or between applications. Also, the Back button can close an _disibledevent=>protected override void _disibledevent=> 
有些情况下需要提醒用户是否要退出当前页面(返回上一页面),例如提醒用户保存当前页。此时可重载OnBackKeyProcess方法如下：
protected override void _disibledevent=> <br/> 用户第一次按下"返回键"时弹出提示窗口，此时，用户再次按下"返回键"时，返回上一页面。<br/> <div> </div> <div id="entry-tags"><span>Tags:</span>  </div> <script language="javascript"> showSns(); </script> <h3 class="related_post_title">延伸阅读</h3> <ul class="related_post"> </ul> </div> </div> <div class="list-y"> <ul class="list"> </ul> </div> <div id="comments"><a name="comment"></a> <h3 id="comments-title">最新评论</h3> <ol class="commentlist"> </ol> <div> </div> </div> <div id="respond"> <h3 id="reply-title">发表评论</h3> <form id="formCmt" method="post" onsubmit="return saveComment();"> <label for="author">昵称</label> <input id="txtUserName" name="txtUserName" type="text" value="" size="30"><br /> <label for="comment">评论</label><textarea id="txtContent" name="txtContent" cols="45" rows="8" aria-required="true">
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