Why did the DataGrid not display

Please check whether you have included the style in App.axaml:

<Application.Styles>
    <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml"/>
</Application.Styles>

💖 Provided by kongdetuo

🔗 Original Document Avalonia 常见问题

（Obtained permission from original author，Modified）