How to customize the Foreground color for cells in a column based on the cell content?

SfDataGrid displays all the text values in GridCells with a default Foreground color of RGB values 51. However SfDataGrid allows you to customize the Foreground color of the GridCells for the entire view and also to some specific cells based on conditions. 

To change the Foreground color of the GridCells for the entire view, you can use the SfDataGrid.GridStyle property and set the custom style to change the foreground color. For more details please refer our user documentation in the below link.

https://help.syncfusion.com/xamarin/datagrid/styles

In case, if your requirement is to change the foreground color based on the cell value, then you can achieve this by using the CellStyle property in the GridColumn. You can write converters for the style properties based on your requirements.

Refer the below code example in which foreground color of the StudentsMarks column is customized based on conditions written in the converter.

<ContentPage.Resources>
  <ResourceDictionary>
    <local:StyleConverterForMarks x:Key="result"/>
  </ResourceDictionary>
</ContentPage.Resources>
 
<sfgrid:GridTextColumn MappingName="StudentMarks" >
  <sfgrid:GridTextColumn.CellStyle>
    <Style TargetType="sfgrid:GridCell">
      <Setter Property="Foreground"
                   Value="{BindingStudentMarks,Converter={StaticResource result}}" />
    </Style>
  </sfgrid:GridTextColumn.CellStyle>
</sfgrid:GridTextColumn>

Refer the below code example for writing a converter to customize the cell foreground based on conditions.

public class StyleConverterForMarks : IValueConverter
{
public object Convert(object value, Type targetType, object parameter,
                      System.Globalization.CultureInfo culture)
 {
   int _value = (int)value;
   if (_value >= 45)
   return Color.Green;
   return Color.Red;
 }
public object ConvertBack(object value, Type targetType, object parameter,
                                            System.Globalization.CultureInfo culture)
 {
   return value();
 }
}

Refer the following screenshot for the final outcome

For more details about applying conditional styles for a column in SfDataGrid, please refer the below user documentation link.

https://help.syncfusion.com/xamarin/datagrid/conditional-styles

You can download the working sample for this KB from the below link.

https://www.syncfusion.com/downloads/support/directtrac/general/ze/Conditional_Styling579879886