Hierarchical Treeview

voula_d · 14 Mar 2024, 11:40

Hi all,
I am trying to create a hierarchical treeview using a HierarchicalDataTemplate and a grouped list. The list is of type List<IGrouping<string, MyClass>> and the way I am binding the treeview to that list is the following:

<TreeView ItemsSource="{Binding GroupedList}" >
        <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding}">
            <TextBlock Text="{Binding Key}" Margin="3 2" />
            <HierarchicalDataTemplate.ItemTemplate>
                <DataTemplate>
                    <ContentControl>
                        <TextBlock Text="{Binding ItemName}"></TextBlock>
                    </ContentControl>
                </DataTemplate>
            </HierarchicalDataTemplate.ItemTemplate>
        </HierarchicalDataTemplate>  
    	</TreeView.ItemTemplate>
    </TreeView>

But this is not working, I am only getting the first level in the Tree and there is no expander or children displayed. Is this supported? If not, how should I bind hierarchical data to a treeview?
Thanks!

27 Mar 2024, 11:31

Hi,

IGrouping is not supported by Noesis, to use a HierarchicalDataTemplate the list should contain the groups, and each group should contain a list of items that you can bind in the template ItemsSource:

public class ViewModel
{
  public List<Group> GroupedList { get; }
}

public class Group
{
  public string Key { get; set; }
  public List<MyClass> ItemsList { get; }
}

public class MyClass
{
  public string ItemName { get; set; }
}

<TreeView ItemsSource="{Binding GroupedList}" >
  <TreeView.ItemTemplate>
    <HierarchicalDataTemplate ItemsSource="{Binding ItemsList}">
      <TextBlock Text="{Binding Key}" Margin="3,2" />
      <HierarchicalDataTemplate.ItemTemplate>
        <DataTemplate>
          <TextBlock Text="{Binding ItemName}"/>
        </DataTemplate>
      </HierarchicalDataTemplate.ItemTemplate>
    </HierarchicalDataTemplate>
  </TreeView.ItemTemplate>
</TreeView>

Hierarchical Treeview

Hierarchical Treeview

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