Databinding MediaPlaybackItem to ListView Item in DataTemplate

问题

Hello i have the following listView :

<ListView x:Name="SongList" HorizontalAlignment="Left" Visibility="Visible" Height="615" Background="White"
          Opacity="0.5" SelectedValue="selectedFile"
          ItemsSource="{Binding MediaModels.MediaPlaybackItemsList  , UpdateSourceTrigger=PropertyChanged}"
          Margin="986,105,0,0" VerticalAlignment="Top" Width="294">

So in my itemSource i bind a list of MediaPlaybackItem .Thats fine everything works good except i dont know how to bind the artist and title for each mediaplayback item to the dataTemplate :

<DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <Border BorderBrush="#404040" BorderThickness="0,0,0,2" HorizontalAlignment="Stretch"
                                Width="282" Height="80">
                            <Grid HorizontalAlignment="Left">
                                <TextBlock Text="{Binding GetDisplayProperties().MusicProperties.Artist}" TextWrapping="WrapWholeWords"
                                           Margin="82,10,10,0" />
                                <Grid Margin="0,0,-140,0">
                                    <Image Source="Images/Album.png" Width="70" Height="70" Margin="0,0,350,0" />
                                </Grid>
                            </Grid>
                        </Border>
                    </StackPanel>
                </DataTemplate>

THe MediaPlaybacKItem class has method GetDisplayProperties().MusicProperties.Artist/Title/etc. which returns string. I can access these properties only through this GetDisplayProperties method , so how can i bind the result of it in data Template ?

回答1:

You cannot bind a method to a property like that. Instead, expose a property in your MediaPlaybackItem that returns the MusicProperties object.

MediaPlaybackItem class

public MusicPropertiesType MusicProperties
{
  get 
  {
    return this.GetDisplayProperties().MusicProperties;
  }
}

Now you can bind that to your ItemTemplate.

XAML

<DataTemplate>
    <StackPanel Orientation="Horizontal">
        <Border BorderBrush="#404040" BorderThickness="0,0,0,2" HorizontalAlignment="Stretch"
                Width="282" Height="80">
            <Grid HorizontalAlignment="Left">
                <TextBlock Text="{Binding MusicProperties.Artist}" TextWrapping="WrapWholeWords"
                           Margin="82,10,10,0" />
                <Grid Margin="0,0,-140,0">
                    <Image Source="Images/Album.png" Width="70" Height="70" Margin="0,0,350,0" />
                </Grid>
            </Grid>
        </Border>
    </StackPanel>
</DataTemplate>

来源：https://stackoverflow.com/questions/43542141/databinding-mediaplaybackitem-to-listview-item-in-datatemplate

标签

mvvm

data-binding

binding

uwp