在 WPF 中，如何强调 ListView 的顶行？

Question

I have a listview in WPF that currently looks like this:

and is generated from this code:

<ListView>
  <ListView.View>
    <GridView>
      <GridViewColumn DisplayMemberBinding="{Binding Author}" Header="Author"/>
      <GridViewColumn DisplayMemberBinding="{Binding MessageShort}" Header="Message"/>
    </GridView>
  </ListView.View>
</ListView>

I would like to visually emphasize or distinguish the first item (the Unsaved Changes line in the picture). This is not a header, but the item to emphasize will always be the first. Is it possible to do so cleanly in WPF, whether from XAML or code?

My research has showed things like using Triggers and/or ItemTemplateSelectors , but both seem like way too much when the only logic is "is the first element". I also found AlternationIndex and AlternationCount and could conceivably set the AlternationCount to some number high enough to never be used and give different templates to AlternationIndex 1 and the rest, though this feels like a hack and still non-trivial. Not to mention I'm not quite sure how to implement it and to make sure it doesn't interfere with the GridView.

Changing style or template properties for a fixed position doesn't seem like it should be a difficult thing to do, but I can't seem to figure it out. Am I missing something obvious?

Answer 1

Binding to PreviousData should do the trick:

        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource PreviousData}}" Value="{x:Null}">
                        <Setter Property="FontWeight" Value="Bold"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </ListView.ItemContainerStyle>

Answer 2

Easiest thing for you would probably be to just add a Brush property to your class that you can bind too. You can set this property value based on your requirements.

Note: Brush requires reference to System.Windows.Media

In your class add.

//Adjust getter/setter if using iNotifyPropertyChanged
public Brush MyBrush { get; set; } = Brushes.White;

Now bind the ListView row background to the property.

<ListView Name="listView" >
   <ListView.Resources>
        <Style TargetType="{x:Type ListViewItem}">
           <Setter Property="Background" Value="{Binding MyBrush}"/>
        </Style>
   </ListView.Resources>
   <ListView.View>
        <GridView>
          <GridViewColumn DisplayMemberBinding="{Binding Author}" Header="Author"/>
             <GridViewColumn DisplayMemberBinding="{Binding MessageShort}" Header="Message"/>
        </GridView>
   </ListView.View>
</ListView>