更改GridView的一行的背景

Question

我在WPF的ListView中有一個GridView 。 ListView （和GridView列）有一個綁定的ObservableCollection ，可以填充它們。

給定ObservableCollection的索引，如何更改GridView一行的背景？ 我需要使用C＃以編程方式進行此操作。

<ListView Margin="12,39,0,0" Name="Library" DataContext="{Binding}" ItemsSource="{Binding _songData}" Height="681" VerticalAlignment="Top" MouseDoubleClick="Library_MouseDoubleClick"  ContextMenu="{StaticResource MyContextMenu}" AlternationCount="2" Background="AliceBlue" HorizontalAlignment="Left" Width="846">
        <ListView.View>
            <GridView x:Name="gvLibrary">
                <!--<GridViewColumn Width="20" Header="hi" DisplayMemberBinding="{Binding isSongPlaying}" x:Name="gvColumnPlaying" />-->
                <GridViewColumn Width="220" Header="Title" DisplayMemberBinding="{Binding Title}" x:Name="gvColumnTitle" />
                <GridViewColumn Width="180" Header="Artist" DisplayMemberBinding="{Binding Artist}" x:Name="gvColumnArtist" />
                <GridViewColumn Width="180" Header="Album" DisplayMemberBinding="{Binding Album}" x:Name="gvColumnAlbum" />
                <GridViewColumn Width="180" Header="Location" DisplayMemberBinding="{Binding Location}" x:Name="gvColumnLocation" />
                <GridViewColumn Width="80" Header="File Type" DisplayMemberBinding="{Binding Ext}" x:Name="gvColumnFileType" />
            </GridView>
        </ListView.View>
    </ListView>

Answer 1

最簡單的方法是使用Style和DataTrigger 。 首先在ListView包含的項目類上添加一個IsSelected屬性：

public class Song : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public void NotifyPropertyChanged(String propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    private bool _IsSelected;
    public bool IsSelected 
    {
        get { return _IsSelected; }
        set
        {
            _IsSelected = value;
            NotifyPropertyChanged("IsSelected");
        }
    }

    ...
}

然后將樣式應用於ListViewItem ：

    <Style TargetType="{x:Type ListViewItem}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Path=IsSelected}" Value="True">
                <Setter Property="Background" Value="Red"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>

現在，無論何時以編程方式設置IsSelected屬性，相應的行都將突出顯示：

_songData[5].IsSelected = true;