找不到DataTemplate.DataTriggers吗?

问题描述

在Windows 8 Metro应用程序的XAML中尝试使用DataTemplate.DataTriggers时，发生了一件非常奇怪的事情.在我的App.xaml中，我正在为数据定义模板.我想使用DataTriggers，但是当我在VS2012编辑器中键入它时，出现错误提示

A pretty strange thing happens when trying to use DataTemplate.DataTriggers in my XAML for Windows 8 Metro app.In my App.xaml, I am defining template for my data. I'd like to use the DataTriggers, but when I type it my VS2012 editor, I get errors stating that

和

当我尝试为DataTemplate设置DataType属性时，也会发生类似的问题:

A similar issue happens when I try to set the DataType property for DataTemplate:

我在这里想念什么?没有这些东西，DataTemplate可以很好地工作，但是对于我来说，在项目中使用它们仍然会容易得多.这是我的XAML的简短片段:

What am I missing here? The DataTemplate works fine without these things, but still it would be much easier for me to use them in my project. Here a short snippet of my XAML:

<DataTemplate x:Key="MyTemplate" >                
            <Grid HorizontalAlignment="Left" Width="450" Height="100">
                <Grid.RowDefinitions>
                    <RowDefinition/>
                    <RowDefinition/>
                    <RowDefinition/>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="10" />
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <Rectangle Grid.Row="0" Grid.RowSpan="3" Stretch="UniformToFill" Width="10">
                    <Rectangle.Fill>
                        <SolidColorBrush Color="#FF425400" />
                    </Rectangle.Fill>
                </Rectangle>
                <TextBlock Text="{Binding Title}" Style="{StaticResource TitleTextStyle}" Grid.Column="1" Grid.Row="0" Grid.ColumnSpan="2"   />
                <TextBlock Text="{Binding Teaser}" Style="{StaticResource SubtitleTextStyle}"  Grid.Column="1" Grid.Row="1"  Grid.ColumnSpan="2"/>
                <TextBlock Text="{Binding Content}" Style="{StaticResource BasicTextStyle}" Grid.Column="1" Grid.Row="2"  />
                <TextBlock Text="{Binding TimeDesc}" Style="{StaticResource BasicTextStyle}" Grid.Column="2" Grid.Row="2"  />
            </Grid>       
            <DataTemplate.DataTriggers>

            </DataTemplate.DataTriggers>
        </DataTemplate>

推荐答案

触发器仅在WPF中可用，而在任何其他XAML平台上均不可用.常见的替代方法是VisualStates，转换器或从代码进行更改.

Triggers are only available in WPF, and not on any of the other XAML platforms. Common alternatives are VisualStates, converters, or making changes from code.

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