Silverlight 4.0 Silverlight ListboxItem可见性绑定_Silverlight 4.0_Expression Blend

Silverlight 4.0 Silverlight ListboxItem可见性绑定

silverlight-4.0

Silverlight 4.0 Silverlight ListboxItem可见性绑定,silverlight-4.0,expression-blend,Silverlight 4.0,Expression Blend,我正在ExpressionBlend 4中制作一个Silverlight应用程序的原型，并尝试根据绑定到的数据中的布尔值显示/隐藏ListBox/ComboBox项。我在网上找到了一个例子，它表明这是可行的，但事实并非如此： <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/200

我正在ExpressionBlend 4中制作一个Silverlight应用程序的原型，并尝试根据绑定到的数据中的布尔值显示/隐藏ListBox/ComboBox项。我在网上找到了一个例子，它表明这是可行的，但事实并非如此：

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:ed="http://schemas.microsoft.com/expression/2010/drawing"
    xmlns:local="clr-namespace:PrototypeScreens"
    mc:Ignorable="d"
    x:Class="PrototypeScreens.Toolbar"
    Width="640" Height="31">
    <UserControl.Resources>
        <local:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White">
        <ComboBox HorizontalAlignment="Right" Style="{StaticResource ComboBox-Sketch}" VerticalAlignment="Top" Width="32" ItemsSource="{Binding Sites}" >
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <Grid>
                    <ed:RegularPolygon Fill="{StaticResource BaseBackground-Sketch}" ed:GeometryEffect.GeometryEffect="Sketch" HorizontalAlignment="Left" Height="10" InnerRadius="0.47211" Margin="0,0,0,0" PointCount="5" Stretch="Fill" Stroke="{StaticResource BaseBorder-Sketch}" StrokeThickness="2" UseLayoutRounding="False" Width="10"
                        Visibility="{Binding IsFavorite, Converter={StaticResource BooleanToVisibilityConverter}}" />                   
                    <TextBlock Style="{StaticResource BasicTextBlock-Sketch}" Text="{Binding Name}" HorizontalAlignment="Left" Margin="15,0,0,0" />                     
                    </Grid>
                </DataTemplate>
            </ComboBox.ItemTemplate>
            <!--
            <ComboBox.ItemContainerStyle>
                <Style TargetType="ComboBoxItem">
                    <Setter Property="Visibility" Value="{Binding IsRegistered, Converter={StaticResource BooleanToVisibilityConverter}}" />
                </Style>
            </ComboBox.ItemContainerStyle>
            -->
        </ComboBox>
        <ListBox Height="29" Margin="0,0,32,0" Style="{StaticResource ListBox-Sketch}" VerticalAlignment="Top" ItemsSource="{Binding Sites}" ScrollViewer.HorizontalScrollBarVisibility="Hidden">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal" FlowDirection="RightToLeft" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid>
                    <TextBlock Style="{StaticResource BasicTextBlock-Sketch}" Text="{Binding Id}" HorizontalAlignment="Left" Margin="0,0,0,0" />                        
                    <ed:RegularPolygon Fill="{StaticResource BaseBackground-Sketch}" ed:GeometryEffect.GeometryEffect="Sketch" HorizontalAlignment="Left" Height="10" InnerRadius="0.47211" Margin="20,0,0,0" PointCount="5" Stretch="Fill" Stroke="{StaticResource BaseBorder-Sketch}" StrokeThickness="2" UseLayoutRounding="False" Width="10"/>                  
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
            <!--
            <ListBox.ItemContainerStyle>
                <Style TargetType="ListBoxItem">
                    <Setter Property="Visibility" Value="{Binding IsFavorite, Converter={StaticResource BooleanToVisibilityConverter}}" />
                </Style>
            </ListBox.ItemContainerStyle>
            -->
        </ListBox>
    </Grid>
</UserControl>

更新：我想我取得了一些进展。似乎无法解析绑定。列表框和组合框都有

ItemsSource=“{Binding Sites}”

和

Sites

类型为

System.Collections.ObjectModel.observetecollection

SiteItem

具有属性

IsRegistered

和

IsFavorite

所以我想问题是：是否可以绑定到

ItemContainerStyle

中的

IsRegistered

和

IsFavorite

？

WPF已经提供了一个现成的BooleantVisibilityConverter。因此，简单地定义如下：

<UserControl.Resources>
    <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</UserControl.Resources>

希望这对您的

BooleantVisibilityConverter的静态资源设置有帮助
？可能是在应用样式之前未创建该样式。您能提供崩溃的详细信息吗？我已经定义了BooleantVisibilityConverter。不过这可能是订单问题。如果应用样式时未创建转换器，则可能存在问题。也许值得一试，看看你是否能计算出事情的完成顺序。试着在VS中打开同一个项目，将调试器附加到blend。然后在BooleanToVisibilityConverter中放置一个制动点，看看它是否被击中。
<UserControl.Resources>
    <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</UserControl.Resources>