DataBound Pivot 控件未创建第一个 PivotItem [英] DataBound Pivot control is not creating the first PivotItem

问题描述

在 Windows Phone 7 页面中，我有以下控件:

</controls:Pivot >

使用此数据模板:

<Image Grid.Column="0" Stretch="Uniform"Source="{Binding LargeImage, Converter={StaticResource UriBitmapConverter}}"/><StackPanel Grid.Column="1" Orientation="垂直"><HyperlinkBut​​ton NavigateUri="{Binding Uri}" Content="{Binding Uri}"/></StackPanel></数据模板>

ItemsSource 是一个 ObservableCollection.显示页面时，它会创建所有 PivotItems，但除非我向前和向后滚动，否则不会创建第一个项目.它在滚动列表中有一个条目，但没有 PivotItem 控件.

如果我在 Pivot Control 的 LoadingPivotItem 事件中设置断点，则在第一次显示枢轴时不会调用它，但只有在我滚动并返回到第一个项目时才会再次被击中.>

有没有人看到 Pivot 控件的类似行为并有解决方法?还是我做错了什么?

解决方案

我遇到了同样的问题.

看来应该在构造函数中设置枢轴的 DataContext.我在 Page_Loaded 事件中设置了我的 DataContext 并且第一个数据透视项不会触发 Loading 事件，如上所述.通过之前简单地绑定我的 DataContext，事件开始触发.

我认为这是框架中的一个错误，但我还没有做足够的工作来确认.

In a Windows Phone 7 page I have the following control:

<controls:Pivot x:Name="Pivoter" Title="{Binding Name}" 
      TitleTemplate="{StaticResource PivotTitleTemplate}" 
      HeaderTemplate="{StaticResource PivotHeaderTemplate}"
      ItemsSource="{Binding Items}"
      ItemTemplate="{StaticResource DisplayItemDataTemplate}">
</controls:Pivot >

with this DataTemplate:

<DataTemplate x:Key="DisplayItemDataTemplate">    
    <Image Grid.Column="0" Stretch="Uniform"
        Source="{Binding LargeImage, Converter={StaticResource UriBitmapConverter}}"/>
    <StackPanel Grid.Column="1" Orientation="Vertical">
        <HyperlinkButton NavigateUri="{Binding Uri}" Content="{Binding Uri}"/>
    </StackPanel>    
</DataTemplate>

The ItemsSource is an ObservableCollection. When the page is displayed it creates all of the PivotItems but the first item does not get created unless I scroll forward and back to it. It has an entry in the scroll list but no PivotItem control.

If I put a break point in the Pivot Control's LoadingPivotItem event it is not called when the pivot is first displayed but again only gets hit when I scroll away and back to the first item.

Has anybody seen similar behavior for the Pivot control and have a work around? Or am I doing something incorrectly?

解决方案

I ran into this same problem.

It appears the DataContext for the pivot should be set in the constructor. I was setting my DataContext in the Page_Loaded event and the first pivot item would not fire the Loading event, as described. By simply binding my DataContext earlier, the event started firing.

I believe it's a bug in the framework, but I haven't done enough to confirm it.

这篇关于DataBound Pivot 控件未创建第一个 PivotItem的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！