Question

出于某种原因，我回到了Silverlight Windows Phone 7.x中的一个项目

所以我下载VS2012 for WP并在过去的工作解决方案中打开。问题是，现在它无法正常工作。

当我开始调试时，模拟器会使用文本抛出异常：

ExceptionObject {MS.Internal.WrappedException: The ItemsControl.ItemsPanelTemplate must have a derivative of Panel as the root element. ---> System.InvalidOperationException: The ItemsControl.ItemsPanelTemplate must have a derivative of Panel as the root element.
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
   at Microsoft.Phone.Controls.PivotItem.MeasureOverride(Size availableSize)

我想问题在这里（当我评论以下代码时它正在运行）

<controls:PivotItem Header="{Binding Path=LocalizedResources.Categories, Source={StaticResource LocalizedStrings}}" Margin="0,12,0,0">
                    <ItemsControl x:Name="_categories" ItemsSource="{Binding CategoriesVM.Categories}">
                        <ItemsControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <ScrollViewer>
                                    <local2:UniformGrid Rows="4" Columns="2"/>
                                </ScrollViewer>
                            </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <Grid>
                                    <Border Margin="9,0" Padding="0" BorderThickness="1" BorderBrush="White" Height="212" Width="210" Canvas.ZIndex="1">
                                        <Image local:LowProfileImageLoader.UriSource="{Binding imgsrc}" Margin="0" Width="210" Height="210" />
                                    </Border>
                                    <Rectangle Width="210" Height="39" Canvas.ZIndex="2" Fill="#FF8DFFFA" VerticalAlignment="Bottom" Margin="0,0,0,10" Opacity="0.8" />
                                    <TextBlock Text="{Binding name}" Canvas.ZIndex="4" VerticalAlignment="Bottom" Margin="25,0,0,17" Foreground="#FFCD1A1A" HorizontalAlignment="Left" />
                                </Grid>
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                    </controls:PivotItem>

我不太清楚该例外是什么意思，有人可以帮我解决这个问题吗？

提前致谢

Answer 1

错误意味着在开始在ItemPanelTemplate中执行任何操作之前，必须首先定义一种类型的面板。 ScrollViewer来自Listbox，而非Panel。

尝试在Grid

中的StackPanel附近添加Canvas，ScrollViewer或ItemsPanelTemplate

Panel的衍生作为根元素

1 个答案: