DataGrid中要在原有的样式上添加样式，可以使用BasedOn来设定基础样式，如下面的

BasedOn="{StaticResource DataGridRowStyle}"

前端的基础框架HandyControl，在开发中想设置DataGrid的行的样式，根据某个绑定的值来设定行的背景色(通过转化器设定Convert)，代码如下

<UserControl.Resources>
        <ResourceDictionary>
            <convert:JudgeResultFGConvert x:Key="judgeResultFGConvert" />
        </ResourceDictionary>
</UserControl.Resources>

...........

<DataGrid.RowStyle>
           <Style TargetType="DataGridRow" BasedOn="{StaticResource DataGridRowStyle}">
                  <Setter Property="Background" Value="{Binding Path=Panduanjieguo, Converter={StaticResource judgeResultFGConvert}}"/>
          </Style>
 </DataGrid.RowStyle>

代码解释：Convert是设置好的转化器，转化器的代码如下

[ValueConversion(typeof(int), typeof(Brushes))]

public class JudgeResultFGConvert : IValueConverter
    {
        //实现接口的两个方法
        #region IValueConverter 成员

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Brushes judgeResultFG = null;
            if (value != null)
            {
                int judgeResultInt = (int)value;
                if (judgeResultInt == 1)
                    return new SolidColorBrush((Color)ColorConverter.ConvertFromString("#CCFFE6"));
                else if (judgeResultInt == 2)
                    return new SolidColorBrush((Color)ColorConverter.ConvertFromString("#E0FFFF"));
                else if (judgeResultInt == 3)
                    return new SolidColorBrush((Color)ColorConverter.ConvertFromString("#FFF0F5"));
            }
            {
                return Brushes.White;
            }
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }