我已经创建了一个
Windows Phone 8.1运行时应用程序.
我正在使用ListView控件.
我想交替每个背景行的颜色.
搜索后我发现这个链接a previous answer.
但是这会给出标记错误.一方面没有’AlternationCount’属性.我假设这是因为它不是SilverLight而是RT?
我的建议是使用带有附加DependencyProperties的Converter类.当您初始化转换器时,您可以定义要引用的项目集合以及背景的备用画笔列表.它可以像这样寻找例子:
- public class AlternateConverter : DependencyObject,IValueConverter
- {
- public List<SolidColorBrush> AlternateBrushes
- {
- get { return (List<SolidColorBrush>)GetValue(AlternateBrushesProperty); }
- set { SetValue(AlternateBrushesProperty,value); }
- }
- public static readonly DependencyProperty AlternateBrushesProperty =
- DependencyProperty.Register("AlternateBrushes",typeof(List<SolidColorBrush>),typeof(AlternateConverter),new PropertyMetadata(new List<SolidColorBrush>()));
- public object CurrentList
- {
- get { return GetValue(CurrentListProperty); }
- set { SetValue(CurrentListProperty,value); }
- }
- public static readonly DependencyProperty CurrentListProperty =
- DependencyProperty.Register("CurrentList",typeof(object),new PropertyMetadata(null));
- public object Convert(object value,Type targetType,object parameter,string language)
- { return AlternateBrushes[(CurrentList as IList).IndexOf(value) % AlternateBrushes.Count]; }
- public object ConvertBack(object value,string language)
- { throw new NotImplementedException(); }
- }
一旦定义并创建备用画笔列表:
- // somewhere in your DataContext
- private List<SolidColorBrush> brushes = new List<SolidColorBrush> { new SolidColorBrush(Colors.Red),new SolidColorBrush(Colors.Blue) };
- public List<SolidColorBrush> Brushes { get { return brushes; } }
你可以这样使用:
- <ListView x:Name="myList" ItemsSource={Binding MyItems}>
- <ListView.Resources>
- <local:AlternateConverter CurrentList="{Binding ElementName=myList,Path=ItemsSource}"
- AlternateBrushes="{Binding Brushes}"
- x:Key="AlternateConverter"/>
- </ListView.Resources>
- <ListView.ItemTemplate>
- <DataTemplate>
- <Border Background="{Binding Converter={StaticResource AlternateConverter}}">
- <!-- your itemtemplate -->
- </Border>
- </DataTemplate>
- </ListView.ItemTemplate>
- </ListView>
这个解决方案应该是有效的,虽然它有价值类型的IList可能有问题.这里也不应该是延迟创建的问题,因为它直接从列表中搜索索引.