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我已经将viewmodel设置为页面的datacontext,并将绑定透视项目与Individual集合属性绑定。然而,绑定工作正常时,有数据,但最初当数据不可用时,它不能正常工作,我基本上想隐藏ItemsControl下的文本框,但不知道这个代码有什么问题。当绑定源为空时,控件未被隐藏
<phone:PivotItem Header="Tweets" Margin="{StaticResource PivotItemMargin}" DataContext="{Binding Tweets}">
<ScrollViewer>
<StackPanel>
<ItemsControl ItemsSource="{Binding Result}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid Margin="0,0,0,30">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="35" />
<RowDefinition Height="75" />
</Grid.RowDefinitions>
<Image Grid.Column="0" Grid.RowSpan="2" Source="{Binding userImage}" Margin="0,0,10,0" MaxWidth="100" MaxHeight="100" Stretch="UniformToFill" Visibility="{Binding userImage, Converter={StaticResource NullToVisibilityConverter}}" />
<TextBlock Grid.Column="1" Grid.Row="0" Text="{Binding name}" Foreground="{StaticResource AppForegroundHighlightTextBrush}" TextWrapping="NoWrap" TextTrimming="WordEllipsis" FontSize="{StaticResource TitleFontSize}"/>
<TextBlock Grid.Column="1" Grid.Row="1" Text="{Binding ShortTitle}" Foreground="{StaticResource AppForegroundSubtextBrush}" TextWrapping="Wrap" VerticalAlignment="Top" FontSize="{StaticResource SubtextFontSize}"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<TextBlock DataContext="{Binding Tweet}" Grid.Row="2" Text="all Tweets" FontWeight="Bold" Visibility="{Binding hasMore,Converter={StaticResource BooleanToVisibilityConverter}}"/>
</StackPanel>
</ScrollViewer>
</phone:PivotItem>
嘿嘿,谢谢。所有这些日子我都无用地创建了NullValueToVisibilityConverter。 :) – Ankit
不客气:)但再次查看您的代码,它看起来更像是Windows Phone(Silverlight)而不是WPF。我只在WPF上测试过它,虽然 – har07
是它的Windows手机,但它在它上面工作得很好。 – Ankit