How to change the color of selected row on datagrid

[s899000]

<Style Selector="DataGridRow:selected"> </Style>

this code not work

[sharpchen]

Use this:

<DataGrid.Styles>
    <Style Selector="DataGridRow:selected /template/ DataGridCellsPresenter">
        <Setter Property="Background" Value="Red"></Setter>
    </Style>
</DataGrid.Styles>

Because all styles have lower priority than local property assignment in xaml, while pseudo class is a event-like status that should be evaluated on runtime
That's why we need a dedicated syntax /template/ to target the nested presenter type
we just need a way to let the styling system know it's something different so that it can manage the priority separately.

See discussions:

• Improve Button and ToggleButton styling #2662 (comment)
• TextBox pointerover not working #2726 (comment)
• https://docs.avaloniaui.net/docs/guides/styles-and-resources/troubleshooting#selector-with-a-pseudoclass-doesnt-override-the-default

By the way to inspect what presenter you should target you can peek the source code of the control(TemplatePart).

[TemplatePart("PART_BottomGridLine", typeof (Rectangle))]
[TemplatePart("PART_CellsPresenter", typeof (DataGridCellsPresenter))]
[TemplatePart("PART_DetailsPresenter", typeof (DataGridDetailsPresenter))]
[TemplatePart("PART_Root", typeof (Panel))]
[TemplatePart("PART_RowHeader", typeof (DataGridRowHeader))]
[Avalonia.Controls.Metadata.PseudoClasses(new string[] {":selected", ":editing", ":invalid"})]
public class DataGridRow : TemplatedControl { ... }