选择并聚焦时如何更改数据网格单元格背景颜色？

Question

I'm trying to change the Background property for the currently selected cell when I double clicked it, but since I'm new to WPF I got some issues. I have tried this way with XAML:

<DataGrid.CellStyle>
   <Style TargetType="DataGridCell">
      <Style.Triggers>
         <Trigger Property="IsFocused" Value="True">
            <Setter Property="Background" Value="#FF333333"/>
         </Trigger>
      </Style.Triggers>
   </Style>
</DataGrid.CellStyle>

And programmatically:

private void DataMapping_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
   var row = sender as DataGridRow;
   row.Background = new SolidColorBrush(Color.FromRgb(51, 51, 51));
}

Any suggestions? Full code for the Datagrid here.

Answer 1

You have to create and set an EditingElementStyle for your data grid column, because you are in edit-mode when you double click a cell. In that mode, the data grid cell contains specific controls for editing, like a TextBox for text columns, so changing the cell background will not have an effect.

The editing style below sets the Background and Foreground of the TextBox in edit-mode.

<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding DataGridRows}" ...>
   <DataGrid.Resources>
      <!-- ...other data grid resources. -->
      <Style x:Key="DataGridTextColumnEditingStyle" 
             TargetType="{x:Type TextBox}"
             BasedOn="{StaticResource {x:Type TextBox}}">
         <Setter Property="Background" Value="#FF333333"/>
         <Setter Property="Foreground" Value="White"/>
      </Style>
   </DataGrid.Resources>
   <!-- ...other data grid code. -->
   <DataGrid.Columns>
      <!-- ...other data grid columns -->
      <DataGridTextColumn Header="CSV Column"
                          IsReadOnly="False"
                          Binding="{Binding Path=CSVColumnValue}"
                          Width="*"
                          Foreground="White"
                          EditingElementStyle="{StaticResource DataGridTextColumnEditingStyle}"/>
   </DataGrid.Columns>
</DataGrid>