c# - C# WPF Treeview ItemContainerStyle 使 mouseclick 事件发送者丢失 TreeviewItem 引用

Question

我有这个有效的代码，

    private void TreeSetup_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
    {
        if (sender is TreeViewItem)
        {
            ((TreeViewItem)sender).IsSelected = true;
        }
        e.Handled = true;
    }

    private void TreeSetup_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
    {
            ContextMenu PopupMenu = this.FindResource("cmButton") as ContextMenu;
            if (TreeSetup.SelectedItem != null)
            {
                PopupMenu.PlacementTarget = sender as TreeViewItem;
                PopupMenu.IsOpen = true;
        }
    }

但是一旦我添加了这个 ItemContainerStyle，

 <TreeView.ItemContainerStyle>
                        <Style TargetType="{x:Type TreeViewItem}">
                            <Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}" />
                            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}"/>
                            <Style.Triggers>
                                <Trigger Property="IsSelected" Value="True">
                                    <Setter Property="FontWeight" Value="Bold" />
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </TreeView.ItemContainerStyle>

我的鼠标按下事件的发送者变成了 TreeView 而不是 TreeViewItem。有谁知道原因并解决这个问题？

标签： c#wpftreeview

Answer 1

我在 ItemContainerStyle 下绑定了 mousedown 事件：

 <TreeView.ItemContainerStyle>
                        <Style TargetType="TreeViewItem">
                            <EventSetter Event="MouseRightButtonDown" Handler="TreeSetup_MouseRightButtonDown"/>
                            <Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}" />
                            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}"/>
                            <Style.Triggers>
                                <Trigger Property="IsSelected" Value="True">
                                    <Setter Property="FontWeight" Value="Bold" />
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </TreeView.ItemContainerStyle>