private void CollapseNextLevel_Click(object sender, RoutedEventArgs e)
{
if (treeDepth >= 0)
{
treeDepth--;
DataTree.CollapseAll();
DataTree.ExpandToDepth(treeDepth);
}
}
private void Expand_Click(object sender, RoutedEventArgs e)
{
if (Expand.IsChecked.HasValue && Expand.IsChecked.Value)
{
DataTree.ExpandAll();
Expand.Content = "收缩所有";
}
else
{
DataTree.CollapseAll();
Expand.Content = "展开所有";
}
}