[Question] Is it possible to attach Behaviors in Styles?

[AIKA1024]

Whether I use:

<Style Selector="c|XListBoxItem">
  <Setter Property="Interaction.Behaviors">
    <BehaviorCollection>
      <i:CanvasItemDragBehavior
        SelectedItems="{Binding ((vm:MapEditPageViewModel)DataContext).SelectedMapEntities, RelativeSource={RelativeSource AncestorType=c:XListbox}}"
        Scale="{Binding ((vm:MapEditPageViewModel)DataContext).Map.Scale, RelativeSource={RelativeSource AncestorType=c:XListbox}}"
        Offset="{Binding ((vm:MapEditPageViewModel)DataContext).Map.Offset, RelativeSource={RelativeSource AncestorType=c:XListbox}}" />
    </BehaviorCollection>
  </Setter>
</Style>

or:

<Style Selector="c|XListBoxItem">
  <Style.Resources>
    <i:CanvasItemDragBehavior x:Shared="False" x:Key="CanvasItemDragBehavior"
      SelectedItems="{Binding ((vm:MapEditPageViewModel)DataContext).SelectedMapEntities, RelativeSource={RelativeSource AncestorType=c:XListbox}}"
      Scale="{Binding ((vm:MapEditPageViewModel)DataContext).Map.Scale, RelativeSource={RelativeSource AncestorType=c:XListbox}}"
      Offset="{Binding ((vm:MapEditPageViewModel)DataContext).Map.Offset, RelativeSource={RelativeSource AncestorType=c:XListbox}}" />
  </Style.Resources>
  <Setter Property="Interaction.Behaviors">
    <BehaviorCollection>
      <StaticResource ResourceKey="CanvasItemDragBehavior"/>
    </BehaviorCollection>
  </Setter>
</Style>

When adding the second element, I always get the error:
"An instance of a behavior cannot be attached to more than one object at a time."

[maxkatz6]

You need BehaviorCollectionTemplate

        <BehaviorCollectionTemplate>
            <BehaviorCollection>
                <EventTriggerBehavior EventName="PointerEnter">
                    <ChangePropertyAction PropertyName="Background" Value="Red" />
                </EventTriggerBehavior>
            </BehaviorCollection>
        </BehaviorCollectionTemplate>

[AIKA1024]

Thanks for the explanation!

[Nick-Crane]

Just a heads up. The BehaviorCollectionTemplate needs adding to the DataGrid Drag and Drop xaml setup. https://wieslawsoltes.github.io/Xaml.Behaviors/articles/drag-and-drop-datagrid/datagrid-drag-and-drop-overview.html
I wasted quite a bit of time trying to figure out what I was doing wrong, until I found this post.