How can I conditionally change the background color of individual cells in a WPF DataGrid based on their values?

Change WPF DataGrid cell background color based on cell value

WPF DataGrid allows customizing cell appearance based on cell value. However, applying styles directly to DataGridCell affects the entire row, not individual cells.

The workaround is to target specific columns containing different cell contents. For example, suppose you want to highlight all cells in the "Name" column that have a value of "John."

TextBlock based cells

For columns containing TextBlocks, you can use the ElementStyle in the column's Trigger to change the Text attribute based on the Background value:

<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>

Value Converter Method

An alternative is to use a value converter to convert the cell value to a brush:

public class NameToBrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.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, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

Usage in XAML:

<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

You can also directly bind Background to a property that returns the desired brush:

public string Name
{
    get { return _name; }
    set
    {
        if (_name != value)
        {
            _name = value;
            OnPropertyChanged(nameof(Name));
            OnPropertyChanged(nameof(NameBrush));
        }
    }
}

public Brush NameBrush
{
    get
    {
        switch (Name)
        {
            case "John":
                return Brushes.LightGreen;
            default:
                break;
        }

        return Brushes.Transparent;
    }
}

Binding in XAML:

<DataGridTextColumn Binding="{Binding Name}">
    <DataGridTextColumn.ElementStyle>
        <Setter Property="Background" Value="{Binding NameBrush}"/>
    </DataGridTextColumn.ElementStyle>
</DataGridTextColumn>

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