How to Implement Conditional Cell Coloring in a WPF DataGrid?

Implementing conditional cell coloring in WPF DataGrid

In WPF DataGrid, dynamically customizing cell colors based on specific values ​​can enhance the visual presentation of data. Although using the DataGrid.CellStyle style seems intuitive, it applies to the entire row rather than individual cells.

Column based customization:

To achieve cell-specific color changes, consider adjusting the style based on the column, taking into account its different content. For example:

<DataGridTextColumn Binding="{Binding Name}">
    <DataGridTextColumn.ElementStyle>
        <Style TargetType="TextBlock">
            <Style.Triggers>
                <Trigger Property="Text" Value="John">
                    <Setter Property="Background" Value="LightGreen"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </DataGridTextColumn.ElementStyle>
</DataGridTextColumn>

This example sets a light green background for cells containing "John" in the "Name" column.

Use value converter:

Alternatively, you can use the value converter to convert the data to color:

public class NameToBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        string input = (string)value;
        switch (input)
        {
            case "John":
                return Brushes.LightGreen;
            default:
                return DependencyProperty.UnsetValue;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

How to use:

<Window.Resources>
    <local:NameToBrushConverter x:Key="NameToBrushConverter"/>
</Window.Resources>
...
<DataGridTextColumn Binding="{Binding Name}">
    <DataGridTextColumn.ElementStyle>
        <Setter Property="Background" Value="{Binding Name, Converter={StaticResource NameToBrushConverter}}"/>
    </DataGridTextColumn.ElementStyle>
</DataGridTextColumn>

Direct attribute binding:

Finally, binding the Background property directly to a property that returns the desired brush provides an alternative approach. In this case, property change notification is needed when the dependency changes color.

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