展开所有WPF树视图项

只需添加此样式

<TreeView.ItemContainerStyle>
    <Style TargetType="TreeViewItem"> 
        <Setter Property="IsExpanded" Value="True" /> 
    </Style> 
</TreeView.ItemContainerStyle>

http://bea.stollnitz.com/blog/?p=55

我找到了一个“黑客”的解决办法。 here 基肖尔库马尔 )

我添加了两个按钮-“全部折叠”和“全部展开”。

    private void btnCollapseAll_Click(object sender, RoutedEventArgs e)
    {
        foreach (var item in treeView.Items)
        {
            DependencyObject dObject = treeView.ItemContainerGenerator.ContainerFromItem(item);
            CollapseTreeviewItems(((TreeViewItem)dObject));
        }
    }

    private void btnExpandAll_Click(object sender, RoutedEventArgs e)
    {
        foreach (var item in treeView.Items)
        {
            DependencyObject dObject = treeView.ItemContainerGenerator.ContainerFromItem(item);
            ((TreeViewItem)dObject).ExpandSubtree();
        }
    }

    private void CollapseTreeviewItems(TreeViewItem Item)
    {
        Item.IsExpanded = false;

        foreach (var item in Item.Items)
        {
            DependencyObject dObject = treeView.ItemContainerGenerator.ContainerFromItem(item);

            if (dObject != null)
            {
                ((TreeViewItem)dObject).IsExpanded = false;

                if (((TreeViewItem)dObject).HasItems)
                {
                    CollapseTreeviewItems(((TreeViewItem)dObject));
                }
            }
        }
    }

我的解决方案基于 this

Bag of tricks