MergedCellsStyleSelector
RadGridView's MergedCellsStyleSelector can be used to style merged cells differently based on a specific condition.
Bear in mind that the MergedCellsStyle takes precedence over the MergedCellsStyleSelector and will overwrite it if both are defined simultaneously.
To do so, first create a new class that inherits the StyleSelector class and override its SelectStyle method:
Example 1: The StadiumCapacityStyleSelector class
public class StadiumCapacityStyleSelector : StyleSelector
{
public override Style SelectStyle(object item, DependencyObject container)
{
var cell = item as MergedCellInfo;
if (cell != null)
{
if (int.Parse(cell.Value.ToString()) > 50000)
{
return BigStadiumStyle;
}
else
{
return SmallStadiumStyle;
}
}
return null;
}
public Style BigStadiumStyle { get; set; }
public Style SmallStadiumStyle { get; set; }
}
Public Class StadiumCapacityStyleSelector
Inherits StyleSelector
Public Overrides Function SelectStyle(item As Object, container As DependencyObject) As Style
Dim cell = TryCast(item, MergedCellInfo)
If cell IsNot Nothing Then
If Integer.Parse(cell.Value.ToString()) > 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 the XAML file, define the style selector as a resource and set the properties of the BigStadiumStyle and SmallStadiumStyle:
Example 2: Setting the BigStadiumStyle and SmallStadiumStyle
<Grid.Resources>
<my:StadiumCapacityStyleSelector x:Key="StadiumCapacityStyleSelector">
<my:StadiumCapacityStyleSelector.BigStadiumStyle>
<Style TargetType="telerik:GridViewMergedCell">
<Setter Property="Background" Value="Red"/>
</Style>
</my:StadiumCapacityStyleSelector.BigStadiumStyle>
<my:StadiumCapacityStyleSelector.SmallStadiumStyle>
<Style TargetType="telerik:GridViewMergedCell">
<Setter Property="Background" Value="Yellow" />
</Style>
</my:StadiumCapacityStyleSelector.SmallStadiumStyle>
</my:StadiumCapacityStyleSelector>
</Grid.Resources>
The "my:" prefix before StadiumCapacityStyleSelector specifies the mapping for the namespace of the project: xmlns:my="..."
Finally, set the MergedCellsStyleSelector property:
Example 3: Setting the MergedCellsStyleSelector property
<telerik:RadGridView MergedCellsDirection="Vertical" MergedCellsStyleSelector="{StaticResource StadiumCapacityStyleSelector}" />
Figure 1: The merged cells styled using the MergedCellsStyleSelector property
