RowDetailsStyleSelector

This article illustrates how to conditionally style row details through RadGridView's RowDetailsStyleSelector property.

First, create a new class which inherits the StyleSelector class (which resides in the System.Windows.Controls assembly) and override its SelectStyle method. Based on your conditions you return the proper Style that will be applied to the DetailsPresenter element.

Example 1: The ConditionalStyleSelector class

C#

    public class ConditionalStyleSelector : StyleSelector
    {
        public override Style SelectStyle(object item, DependencyObject container)
        {
            if (item is Club)
            {
                var club = item as Club;
                if (club.StadiumCapacity > 50000)
                {
                    return BigStadiumStyle;
                }
                else
                {
                    return SmallStadiumStyle;
                }
            }

            return base.SelectStyle(item, container);
        }

        public Style BigStadiumStyle { get; set; }
        public Style SmallStadiumStyle { get; set; }
    }

VB.NET

	Public Class StadiumCapacityStyle
	 Inherits StyleSelector
	 Public Overrides Function SelectStyle(item As Object, container As DependencyObject) As Style
	  If TypeOf item Is Club Then
	   Dim club As Club = TryCast(item, Club)
	   If club.StadiumCapacity > 50000 Then
	    Return BigStadiumStyle
	   Else
	    Return SmallStadiumStyle
	   End If
	  End If
	  Return Nothing
	 End Function
	 Public Property BigStadiumStyle() As Style
	  Get
	   Return m_BigStadiumStyle
	  End Get
	  Set
	   m_BigStadiumStyle = Value
	  End Set
	 End Property
	 Private m_BigStadiumStyle As Style
	 Public Property SmallStadiumStyle() As Style
	  Get
	   Return m_SmallStadiumStyle
	  End Get
	  Set
	   m_SmallStadiumStyle = Value
	  End Set
	 End Property
	 Private m_SmallStadiumStyle As Style
	End Class

In this case we have two different styles that could be applied:

• BigStadiumStyle
• SmallStadiumStyle.

Depending on the underlying data you can select which style to apply.

Next, in the XAML file define the style selector as a resource and set the properties of the BigStadiumStyle and SmallStadiumStyle:

Example 2: Set the different styles for the style selector

XAML

		<Grid.Resources>
            <my:ConditionalStyleSelector x:Key="StadiumCapacityStyleSelector">
                <my:ConditionalStyleSelector.BigStadiumStyle>
                    <Style TargetType="telerik:DetailsPresenter">
                        <Setter Property="Background" Value="Red" />
                        <Setter Property="Foreground" Value="Yellow" />
                    </Style>
                </my:ConditionalStyleSelector.BigStadiumStyle>
                <my:ConditionalStyleSelector.SmallStadiumStyle>
                    <Style TargetType="telerik:DetailsPresenter">
                        <Setter Property="Background" Value="Yellow" />
                        <Setter Property="Foreground" Value="Red" />
                    </Style>
                </my:ConditionalStyleSelector.SmallStadiumStyle>
            </my:ConditionalStyleSelector>
		</Grid.Resources>

The "my:" prefix before StadiumCapacityStyle specifies the mapping for the namespace of the project: xmlns:my="

If you are using our Implicit Styles, you should base the style on the DetailsPresenterStyle.

Finally, set the RowDetailsStyleSelector property of the RadGridView:

Example 3: Set RadGridView's RowDetailsStyleSelector

XAML

	<telerik:RadGridView RowDetailsStyleSelector="{StaticResource StadiumCapacityStyleSelector}" />

And here is the final result:

Figure 1: The row details styled using the RowDetailsStyleSelector property

nother approach for achieving the same result is demonstrated in the WPF Controls Samples under StyleSelectors -> Row Details.

See Also

• Styling Row Details