How to Conditionally Change WPF DataGrid Cell Background Colors Based on Cell Values?

Change WPF DataGrid cell color based on value

In WPF DataGrid, customizing the appearance of individual cells based on specific values ​​can enhance your data visualizations. However, if you have issues with entire rows being highlighted when you only want to color specific cells, you may need to examine your code to identify the root cause.

The initial code sets the DataGrid.CellStyle, but this method affects the entire row because the DataContext is set to the row rather than the individual cell. To solve this problem, it is recommended to target specific columns and customize their appearance based on different content such as text, combo boxes, and check boxes. Here is an example of how to change the background of a cell named "John".

<code class="language-xml"><DataGridTextColumn Binding="{Binding Name}">
    <DataGridTextColumn.CellStyle>
        <Style TargetType="DataGridCell">
            <Style.Triggers>
                <Trigger Property="Text" Value="John">
                    <Setter Property="Background" Value="LightGreen"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </DataGridTextColumn.CellStyle>
</DataGridTextColumn></code>

Alternatively, you can use a ValueConverter to map values ​​to colors, allowing you to define color schemes flexibly. Here is an example:

<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;
            // 添加更多情况
            default:
                return DependencyProperty.UnsetValue;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}</code>

ValueConverter usage:

<code class="language-xml"><DataGridTextColumn Binding="{Binding Name}">
    <DataGridTextColumn.CellStyle>
        <Setter Property="Background" Value="{Binding Name, Converter={StaticResource NameToBrushConverter}}"/>
    </DataGridTextColumn.CellStyle>
</DataGridTextColumn></code>

Finally, the third method allows you to bind the cell's background directly to a property that returns the corresponding color. By implementing the INotifyPropertyChanged interface, you can cause property changes to trigger updates in the user interface.

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