使用MVVM Light的Windows应用商店应用中的附加行为

我一直在尝试使用MVVM Light框架在一个简单的Windows应用商店应用程序中使用附加行为。因为我们不能使用System.Windows.Interactive，就像在Windows Phone中一样，我一直在使用和lybraries。它们工作得很好，但问题是，我不能在数据模板中声明附加的行为

我真正想要的是将命令附加到GridView中的任何项，以便我可以将项id作为参数传递。由于附加的行为不起作用，我找到的唯一解决方案是使用GridView的“SelectionChanged”事件，并将SelectedItem作为参数传递给ViewModel中的属性：

    <GridView Grid.Row="1"
              x:Name="itemGridView"
              AutomationProperties.AutomationId="ItemsGridView"
              AutomationProperties.Name="Items"
              TabIndex="1"
              Padding="116,136,116,46"
              ItemsSource="{Binding GeoTopArtists.topartists.artist}"
              SelectionMode="Single"
              SelectedItem="{Binding SelectedArtist, Mode=TwoWay}"
              IsSwipeEnabled="False"
              IsItemClickEnabled="False">

        <WinRtBehaviors:Interaction.Behaviors>
            <Win8nl_Behavior:EventToCommandBehavior Event="SelectionChanged" Command="SelectArtistCommand" CommandParameter="{Binding SelectedArtist.mbid}"/>
        </WinRtBehaviors:Interaction.Behaviors>

        <GridView.ItemTemplate>
            <DataTemplate>
                <Grid HorizontalAlignment="Left" Width="250" Height="250">
                    <Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}">
                        <Image Source="{Binding image[4].text}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
                    </Border>
                    <StackPanel VerticalAlignment="Bottom" Background="{StaticResource ListViewItemOverlayBackgroundThemeBrush}">
                        <TextBlock Text="{Binding name}" Foreground="{StaticResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextStyle}" Height="60" Margin="15,0,15,0"/>
                        <TextBlock Text="{Binding url}" Foreground="{StaticResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/>
                    </StackPanel>
                </Grid>
            </DataTemplate>
        </GridView.ItemTemplate>
    </GridView>

这样做会很好（在ViewModel中不需要SelectedArtist属性）

这可能对您有所帮助。dependency属性已定义并连接到视图模型中的命令。因此，每当视图中有交互时，所选项目都可以作为命令参数发送，这在本视频中得到了清楚的演示

    <GridView Grid.Row="1"
              x:Name="itemGridView"
              AutomationProperties.AutomationId="ItemsGridView"
              AutomationProperties.Name="Items"
              TabIndex="1"
              Padding="116,136,116,46"
              ItemsSource="{Binding GeoTopArtists.topartists.artist}"
              SelectionMode="None"
              IsSwipeEnabled="False"
              IsItemClickEnabled="False">

        <GridView.ItemTemplate>
            <DataTemplate>
                <Grid HorizontalAlignment="Left" Width="250" Height="250">
                    <Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}">
                        <Image Source="{Binding image[4].text}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
                    </Border>
                    <StackPanel VerticalAlignment="Bottom" Background="{StaticResource ListViewItemOverlayBackgroundThemeBrush}">
                        <TextBlock Text="{Binding name}" Foreground="{StaticResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextStyle}" Height="60" Margin="15,0,15,0"/>
                        <TextBlock Text="{Binding url}" Foreground="{StaticResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/>
                    </StackPanel>

        <WinRtBehaviors:Interaction.Behaviors>
            <Win8nl_Behavior:EventToCommandBehavior Event="Tapped" Command="SelectArtistCommand" CommandParameter="{Binding Artist.mbid}"/>
        </WinRtBehaviors:Interaction.Behaviors>

                </Grid>
            </DataTemplate>
        </GridView.ItemTemplate>
    </GridView>