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我将 PivotItems 与 MVVM 绑定,然后尝试更改标题的前景色。问题是当我仅以编程方式添加项目时我的代码有效。现在有了这个绑定,我的标题是我的自定义对象,我不能正确地转换它:

private void Pivot_SelectionChanged(object sender, Windows.UI.Xaml.Controls.SelectionChangedEventArgs e)
    {
        if (0 < e.AddedItems.Count)
        {
            PivotItem currentItem = e.AddedItems[0] as PivotItem;

            if (null != currentItem)
            {
                if (null != currentItem.Header)
                {
                    (currentItem.Header as TextBlock).Foreground = new SolidColorBrush(Color.FromArgb(255, 255, 255, 255));
                }
            }
        }

        if (0 < e.RemovedItems.Count)
        {
            PivotItem currentItem = e.RemovedItems[0] as PivotItem;

            if (null != currentItem)
            {
                if (null != currentItem.Header)
                {
                    (currentItem.Header as TextBlock).Foreground = new SolidColorBrush(Color.FromArgb(64, 255, 255, 255));
                }
            }
        }
    }

此行会导致问题,因为现在 e.AddedItems[0] 不是 PivotItem 类型,而是我的自定义对象,因此它为 null..

PivotItem currentItem = e.AddedItems[0] as PivotItem;

这是我的 XAML:

<Pivot x:Name="MyPivot" Title="MasterViewModel" Foreground="#FF888888" Style="{StaticResource PivotStyle1}" SelectionChanged="Pivot_SelectionChanged" Margin="0" Grid.Row="1" ItemsSource="{Binding MyCustomViewModel.Se}" ItemTemplate="{StaticResource MyTemplate1}">
        <Pivot.HeaderTemplate>
            <DataTemplate>
                <Grid>
                    <TextBlock Text="{Binding myProp}" Margin="0, 16, 0, 0" Foreground="#FF888888" FontSize="32" FontFamily="Segoe WP" FontWeight="Light"/>
                </Grid>
            </DataTemplate>
        </Pivot.HeaderTemplate>
    </Pivot>
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