How to show the selection of row/cell when setting the background for SfDataGrid GridCell in WPF ?

Problem

Row/Cell selection border is behind the GridCell content. So when you apply the background for GridCell, the selection is not displayed in the UI. The following code example shows you how to set the GridCell style.

<!--Need to add this code snippet in Resources Define the style with Key-->
<Style x:Key="ApplyCellStyle" TargetType="Syncfusion:GridCell">
       <Setter Property="Background">
              <Setter.Value>
                   <SolidColorBrush Color="Blue" />
               </Setter.Value>
        </Setter>          
</Style>       

<Syncfusion:SfDataGrid x:Name="datagrid" 
                      ColumnSizer="Star" 
                      SelectionUnit="Row"  
                      AllowSelectionOnPointerPressed="True"  
                      RowSelectionBrush="Red"  
                      CellStyle="{StaticResource ApplyCellStyle}"  
                      ItemsSource="{Binding GDCSource}"  
                      SelectionMode="Single" >
</Syncfusion:SfDataGrid>

In the following screenshot, the selection is set in the 5th row, but it is not displayed in View with the selection border in the Cell Content presenter.

Solution

You can overcome this problem by reducing the Opacity for the brush that you set to the GridCell background. The following code example shows you how to set the Opacity to GridCell.

<!--Need to add this code snippet in Resources Define the style with Key-->
<Style x:Key="ApplyCellStyle" TargetType="Syncfusion:GridCell">
       <Setter Property="Background">
              <Setter.Value>
                   <SolidColorBrush Color="Blue" Opacity="0.5"/>
               </Setter.Value>
        </Setter>          
</Style>       
<Syncfusion:SfDataGrid x:Name="datagrid" 
                      ColumnSizer="Star" 
                      SelectionUnit="Row"  
                      AllowSelectionOnPointerPressed="True"  
                      RowSelectionBrush="Red"  
                      CellStyle="{StaticResource ApplyCellStyle}"  
                      ItemsSource="{Binding GDCSource}"  
                      SelectionMode="Single" >
</Syncfusion:SfDataGrid>

The following screenshot shows you the selection of row after applying the background for GridCell.

Take a moment to peruse the WPF DataGrid - Conditional Styling documentation, where you can find about conditional styling with code examples.

View Sample in GitHub.