I' made a workaround and I'm sharing it:
Used a MultiBinding Converter and added the Window Width and the rest of the columns ActualWidth as parameters
<syncfusion:GridTextColumn.Width>
<MultiBinding Converter="{StaticResource AutoFillColumnWidthConverter}">
<Binding Path="Width" ElementName="Window" FallbackValue="0"/>
<Binding Path="ActualWidth" ElementName="Column1" FallbackValue="0"/>
<Binding Path="ActualWidth" ElementName="Column3" FallbackValue="0"/>
<Binding Path="ActualWidth" ElementName="Column4" FallbackValue="0"/>
<Binding Path="ActualWidth" ElementName="LastColumn" FallbackValue="0"/>
</MultiBinding>
</syncfusion:GridTextColumn.Width>
public class AutoFillColumnWidthConverter : IMultiValueConverter
{
public double WindowWidth { get; set; }
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
WindowWidth = (double)values[0];
double DataGridWidth = 0;
List<object> list = values.ToList();
list.RemoveAt(0);
foreach (var value in list)
{
double width = System.Convert.ToDouble(value);
if (!double.IsNaN(width))
{
DataGridWidth += width;
}
}
return WindowWidth - DataGridWidth;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
