blocks|key|2295096|text|你不需要。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2295097|拉入刷新不是标准的Windows+Phone交互，因此您不应该实现它。|2295098|没有本机/第一方Windows+Phone应用程序使用此功能，几乎也没有第三方应用程序使用此功能。这是有原因的。|2295099|要刷新页面的内容(在您的示例中是LongListSelector)，您应该使用+refresh++ApplicationBacIconButton，就像在邮件应用程序中一样。这是管理刷新的标准和首选方式。|offset|length|style|CODE|BOLD|2295100|Windows+Phone不是+Android，也不是iOS。在为它设计应用程序时请牢记这一点。|2295101|这不是动物园，有规定的。|2295102|entityMap^0|0|0|0|G|G|1D|O|13|9|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|V|8|@$H|W|I|X|J|K]|$H|Y|I|Z|J|K]|$H|10|I|11|J|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|12|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|13|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|R|$]]

You do not.

Pull-to-refresh is not a standard Windows Phone interaction, and you therefore should not implement it.

No native/first-party Windows Phone application use this functionality, and almost no third-party application does either. There is a reason for that.

To refresh the content of a page (or in your case, a <code>LongListSelector</code>), you should use a refresh <code>ApplicationBacIconButton</code>, just like in the Mail app. That's the standard and preferred way to manage refreshes.

Windows Phone is not Android, nor is it iOS. Keep that in mind when designing an application for it.

It is not a zoo, there are rules.

blocks|key|387994|text|实际上，我刚刚发现了一个在2012年11月30日上传到Windows+Phone开发中心的项目，它使用Twitter搜索和Windows+Phone+8+LongListSelector实现了“无限滚动”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|387995|下载此项目：http://code.msdn.microsoft.com/wpapps/TwitterSearch-Windows-b7fc4e5e|offset|length|387996|entityMap|0|LINK|mutability|MUTABLE|url|http://code.msdn.microsoft.com/wpapps/TwitterSearch-Windows-b7fc4e5e^0|0|6|1W|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Actually, I just discovered a project uploaded to the Windows Phone Dev Center on November 30, 2012 that implements "infinite scrolling" using Twitter Search and Windows Phone 8 LongListSelector.

Download this project at: <a href="http://code.msdn.microsoft.com/wpapps/TwitterSearch-Windows-b7fc4e5e">http://code.msdn.microsoft.com/wpapps/TwitterSearch-Windows-b7fc4e5e</a>

blocks|key|3359464|text|如果你真的必须这样做(参见Miguel+Rochefort的答案)，那么可以在http://blogs.msdn.com/b/jasongin/archive/2011/04/13/pull-down-to-refresh-a-wp7-listbox-or-scrollviewer.aspx上找到详细信息|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3359465|基本上，ScrollViewer具有隐藏/未记录的状态，允许在列表的顶部或底部检测“压缩”，您可以使用此状态来触发加载。|style|CODE|3359466|entityMap|0|LINK|mutability|MUTABLE|url|http://blogs.msdn.com/b/jasongin/archive/2011/04/13/pull-down-to-refresh-a-wp7-listbox-or-scrollviewer.aspx^0|13|2Z|0|0|4|C|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

If you really must do this (see answer by Miguel Rochefort) then details can be found at <a href="http://blogs.msdn.com/b/jasongin/archive/2011/04/13/pull-down-to-refresh-a-wp7-listbox-or-scrollviewer.aspx" rel="nofollow">http://blogs.msdn.com/b/jasongin/archive/2011/04/13/pull-down-to-refresh-a-wp7-listbox-or-scrollviewer.aspx</a>

Basically, the <code>ScrollViewer</code> has hidden/undocumented states that allow for detecting "compression" at the top or bottom of the list and you can use this to trigger the loading.

blocks|key|3359593|text|这并不是完全无关紧要的，但其中一种方法是使用GestureService|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3359594|++++++++this.gestureListener+=+GestureService.GetGestureListener(containerPage);
++++++++this.gestureListener.DragStarted+%2B=+gestureListener_DragStarted;
++++++++this.gestureListener.DragCompleted+%2B=+gestureListener_DragCompleted;
++++++++this.gestureListener.DragDelta+%2B=+gestureListener_DragDelta;|code-block|syntax|javascript|3359595|然而，它有一些bug。例如，DragCompleted并不总是被引发，因此您需要使用ManipulationCompleted事件仔细检查它，这似乎更可靠。|3359596|++++++++containerPage.ManipulationStarted+%2B=+delegate+{+this.manipulationInProgress+=+true;+};
++++++++containerPage.ManipulationCompleted+%2B=+delegate
++++++++{+
++++++++++++this.manipulationInProgress+=+false;
++++++++++++PerformDragComplete();+
++++++++};|3359597|另一个问题是DragDelta偶尔会报告错误的坐标。因此，您需要这样的修复：|3359598|++++Point+refPosition+=+e.GetPosition(null);
++++if+(refPosition.X+==+0+&&+refPosition.Y+==+0)
++++{
++++++++Tracer.WriteLine("Skipping+buggy+event");
++++++++return;
++++}|3359599|最后，您可以查看list是否一直位于顶部：|3359600|public+double+VerticalOffset
{
++++get
++++{
++++++++ViewportControl+viewportControl+=+this.FindChildByName("ViewportControl")+as+ViewportControl;
++++++++if+(viewportControl+!=+null)
++++++++{
++++++++++++Tracer.WriteLine("ViewPort.Bounds.Top="+%2B+viewportControl.Bounds.Top+%2B++"+ViewPort.Top="+%2B+viewportControl.Viewport.Top.ToString()+%2B+"+State="+%2B+this.ManipulationState);
++++++++++++return+viewportControl.Bounds.Top+-+viewportControl.Viewport.Top;
++++++++}
++++++++return+double.NaN;
++++}
}|3359601|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

This is not completely trivial, but one way of doing it is to use GestureService

<pre><code> this.gestureListener = GestureService.GetGestureListener(containerPage);
 this.gestureListener.DragStarted += gestureListener_DragStarted;
 this.gestureListener.DragCompleted += gestureListener_DragCompleted;
 this.gestureListener.DragDelta += gestureListener_DragDelta;
</code></pre>

However, it has some bugs. For example, DragCompleted is not always raised, so you need to double-check for that using ManipulationCompleted event, which seems to be more reliable.

<pre><code> containerPage.ManipulationStarted += delegate { this.manipulationInProgress = true; };
 containerPage.ManipulationCompleted += delegate
 { 
 this.manipulationInProgress = false;
 PerformDragComplete(); 
 };
</code></pre>

Another issue is that DragDelta occasionally reports bad coordinates. So you would need a fix like this:

<pre><code> Point refPosition = e.GetPosition(null);
 if (refPosition.X == 0 &amp;&amp; refPosition.Y == 0)
 {
 Tracer.WriteLine("Skipping buggy event");
 return;
 }
</code></pre>

Finally, you can find if list is all the way at the top:

<pre><code>public double VerticalOffset
{
 get
 {
 ViewportControl viewportControl = this.FindChildByName("ViewportControl") as ViewportControl;
 if (viewportControl != null)
 {
 Tracer.WriteLine("ViewPort.Bounds.Top=" + viewportControl.Bounds.Top + " ViewPort.Top=" + viewportControl.Viewport.Top.ToString() + " State=" + this.ManipulationState);
 return viewportControl.Bounds.Top - viewportControl.Viewport.Top;
 }
 return double.NaN;
 }
}
</code></pre>

blocks|key|3359563|text|你可以在https://github.com/Kinnara/WPToolkit中查看示例，它有一个很好的实现，叫做longllistselector控件的ListView扩展，这将真正地帮助你。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3359564|记住，对于longlistselector，总是尝试加载至少20个项目。=)|3359565|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Kinnara/WPToolkit^0|4|10|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

You can check out the samples in 
<a href="https://github.com/Kinnara/WPToolkit" rel="nofollow">https://github.com/Kinnara/WPToolkit</a>
it has an excellent implementation something called a ListView extension of the longllistselector control, that will really help you out.

and remember with longlistselector always try to load 20 items atleast. =)

blocks|key|2295145|text|由于WP8+LLS不使用滚动查看器，我猜您将不得不检查UI树来控制视口控件，并查看您可以对ViewportControl.Viewport属性做些什么……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2295146|哦..。twitter应用程序现在正在使用pull刷新交互。我喜欢WP平台的UI指南，但规则一旦掌握，就会被打破;)|2295147|这篇文章的here可以给你一些提示，告诉你如何获得视口控件和恢复滚动偏移量。当列表跳动时，此滚动偏移量必须是特定值|offset|length|2295148|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/15121139/how-can-i-get-the-verticaloffset-of-a-longlistselector-in-wp8?rq=1^0|0|0|5|4|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

As the WP8 LLS doesn't use a scrollviewer, I guess you will have to inspect the UI tree to get a hold on the viewport control and see what you can do with ViewportControl.Viewport property ...

Oh ... the twitter application is now using the pull to refresh interaction. I like the UI guidelines of the WP platform but rules, once mastered, are made to be broken ;)

This post <a href="https://stackoverflow.com/questions/15121139/how-can-i-get-the-verticaloffset-of-a-longlistselector-in-wp8?rq=1">here</a> can give you hints on how to get the viewport control and retreive the scrolling offset. this scrolling offset must be of a particular value when the list is bouncing

I am writing a new WP8 app using the off-the-shelf LongListSelector that is shipped in the Microsoft.Phone.Controls assembly. Can anyone provide a code example that implements pull-to-refresh, originally made popular by Tweetie for iPhone and now common on iOS and Android? The existing examples use non-standard controls and I'd like to maintain my use of LongListSelector in WP8.

EDIT

I have found a good answer on StackOverflow describing the Twitter sample and how to do this in more detail: 

<a href="https://stackoverflow.com/questions/13381752/continuous-pagination-with-longlistselector">Continuous Pagination with LongListSelector</a>

How does one implement pull-to-refresh with a LongListSelector in Windows Phone 8?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用Microsoft.Phone.Controls程序集中附带的现成LongListSelector编写一个新的WP8应用程序。有没有人能提供一个实现pull-to-refresh的代码示例?pull-to-refresh最初是由iPhone上的Tweetie流行起来的，现在在iOS和安卓上很常见？现有的示例使用了非标准控件，我希望在WP8中继续使用LongListSelector。编辑我

问如何在Windows phone8中使用LongListSelector实现拉刷新？
EN

回答 6

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