How to Change WPF DataGrid Cell Colors Based on Values?

Change WPF DataGrid cell color based on data value

When using the WPF DataGrid control, you usually need to customize the visual appearance of the cell based on its data value. While using DataGrid.CellStyle may seem like an easy approach, it may inadvertently apply styles to the entire row instead of individual cells. Let's explore alternative ways of implementing cell-specific coloring.

Column based styling

To apply styles to specific cells in a column, consider customizing the ElementStyle property of each DataGridTextColumn. For example, to change the background color of a cell whose Name is "John", use the following code:

<code class="language-xml"><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></code>

Value Converter

For more complex shading logic, you can use value converters. Here is an example of mapping Name values ​​to corresponding brushes:

<code class="language-csharp">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();
    }
}</code>

How to use:

<code class="language-xml"><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></code>

Property Binding

Alternatively, you can directly bind the cell's Background property to a property that returns the desired brush. In this approach, make sure that the property change notification is raised whenever the color dependency changes.

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