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DataGrid/GroupStyle/ContainerStyle/Styleに配置された動作（pnlDgSubFooter）からデータグリッドの親をバインドしたい[GroupItem]/Setter [テンプレート]/ControlTemplate/Expander /ヘッダー/ DockPanel/StackPanel ただし、バインディングはDockPanelから離れることはできません。 ElementNameの には、 "btnExpandAll"と自分だけがあります。行動の 、LeDataGridプロパティの戻りなかれヌルXAML =>グループの子からDatagridの親にアクセスできない
<DataGrid Grid.Row="0" x:Name="dgMain" AutoGenerateColumns="False" SelectionUnit="FullRow" LoadingRow="dgMain_LoadingRow" MouseDown="dgMain_MouseDown" Sorting="dgMain_Sorting"
CanUserReorderColumns="False" CanUserResizeColumns="True" CanUserResizeRows="False" CanUserSortColumns="True" CanUserAddRows="False"
Style="{StaticResource dg}" RowStyle="{StaticResource dgRow}" CellStyle="{StaticResource dgCell}" ColumnHeaderStyle="{StaticResource dgColHeader}" RowHeaderStyle="{StaticResource dgRowHeader}"
ItemsSource="{Binding NotifyOnSourceUpdated=True, Source={StaticResource cvsElmts}}" HorizontalAlignment="Left" >
<!--DataGrid.DataContext><Binding Source="{StaticResource tblUsers}"/></DataGrid.DataContext-->
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<mvvm:EventToCommand Command="{Binding SendCommand, Mode=OneWay}" CommandParameter="{Binding SelectedItem, ElementName=dgMain}" PassEventArgsToCommand="False"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<DataGrid.GroupStyle>
<GroupStyle>
<!-- Style for groups under the top level. -->
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Margin" Value="0,0,0,5"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="{Binding DataContext.ExpandedAll, Mode=OneWay, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" BorderThickness="1,1,1,5">
<Expander.Style>
<Style TargetType="{x:Type Expander}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsBottomLevel}" Value="True">
<Setter Property="Margin" Value="8,0,0,0" />
</DataTrigger>
</Style.Triggers>
</Style>
</Expander.Style>
<Expander.Header>
<DockPanel>
<Button Name="btnExpandAll" Command="{Binding DataContext.ExpandedAllCommand, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" Click="btnExpandAll_Click" ToolTip="{x:Static resx:resMain.lblExpandAll}" BorderThickness="0">
<TextBlock Grid.Column="0" Text="" FontFamily="{StaticResource FntSymbol}" Foreground="{StaticResource scbBlack}" FontSize="12" VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Button>
<TextBlock FontWeight="Bold" Text="" Margin="5,0,0,0"><Run Text="{Binding Path=Name, Mode=OneWay}" /><Run Text=" ("/><Run Text="{Binding Path=ItemCount, Mode=OneWay}" /><Run Text=" éléments)."/></TextBlock>
<StackPanel Name="pnlDgSubFooter" HorizontalAlignment="Left" Orientation="Horizontal" >
<i:Interaction.Behaviors>
<Classes:BehaviorWithCommand LeDataGrid="{Binding DataContext, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" LeGroupe="{Binding .}" />
</i:Interaction.Behaviors>
</StackPanel>
</DockPanel>
</Expander.Header>
<Expander.Content>
<Border BorderThickness="1" BorderBrush="{StaticResource scbGrey3}">
<ItemsPresenter />
</Border>
</Expander.Content>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
....
行動（私は結合するか、またはbtnExpandAll場合を除く。）：これは、働いている
public class BehaviorWithCommand : Behavior<FrameworkElement> { // StackPanel
public static readonly DependencyProperty LeDataGridProperty = DependencyProperty.Register(nameof(LeDataGrid), typeof(object), typeof(BehaviorWithCommand), new PropertyMetadata(null));
public static readonly DependencyProperty LeGroupeProperty = DependencyProperty.Register(nameof(LeGroupe), typeof(object), typeof(BehaviorWithCommand), new PropertyMetadata(null));
public object LeDataGrid {
get { return (object)GetValue(LeDataGridProperty); }
set { SetValue(LeDataGridProperty, value); }
}
public object LeGroupe {
get { return (object)GetValue(LeGroupeProperty); }
set { SetValue(LeGroupeProperty, value); }
}
protected override void OnAttached() {
base.OnAttached();
((Panel)AssociatedObject).Children.Clear();
var dg = new DataGrid();
dg.Columns.Add(new DataGridTextColumn());
dg.Columns.Add(new DataGridTextColumn());
dg.Columns.Add(new DataGridTextColumn());
//var dg = (DataGrid)LeDataGrid;
foreach (var item in dg.Columns) {
var g = new Grid() { MinWidth = 10 };
g.SetBinding(Grid.WidthProperty, new System.Windows.Data.Binding("ActualWidth") { Source = item }); // dhHeadName DataGridColumn
var t = new TextBox() { Margin = new Thickness(1, 0, 1, 0), Background = new SolidColorBrush(Color.FromRgb(200, 200, 200)), FontWeight = FontWeights.Bold, FontSize = 9, IsReadOnly = true };
t.Text = "Coucou";
g.Children.Add(t);
((Panel)AssociatedObject).Children.Add(g);
}
}
protected override void OnDetaching() {
base.OnDetaching();
}
}