How to load items in WPF HierarchyNavigator?
This article describes how to dynamically load next level items (on-demand loading) in WPF HierarchyNavigator (Breadcrumb) when an item is selected.
In this example, files in the system drive are loaded as next level items on-demand using the HierarchyNavigatorSelectedItemChanged event.
The following code example demonstrates the same.
XAML
MainWindow.xaml
<Grid>
<syncfusion:HierarchyNavigator ItemsSource = "{Binding HierarchyItems}" x:Name="hierarchy" Height="50" Width="500" HierarchyNavigatorSelectedItemChanged="Hierarchy_HierarchyNavigatorSelectedItemChanged">
<syncfusion:HierarchyNavigator.ItemTemplate>
<HierarchicalDataTemplate ItemsSource = "{Binding FileItems}" >
<TextBlock Text="{Binding Content}"/>
</HierarchicalDataTemplate>
</syncfusion:HierarchyNavigator.ItemTemplate>
</syncfusion:HierarchyNavigator>
</Grid>
In the below code, next level items are added to the collection in HierarchyNavigatorSelectedItemChanged on-demand.
C#
MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Hierarchy_HierarchyNavigatorSelectedItemChanged(object sender, Syncfusion.Windows.Tools.Controls.HierarchyNavigatorSelectedItemChangedEventArgs e)
{
if (hierarchy.SelectedItem == null)
return;
HierarchicalModel selectedItem = hierarchy.SelectedItem as HierarchicalModel;
string[] dirs = Directory.GetDirectories(selectedItem.Content, "*", SearchOption.TopDirectoryOnly);
foreach (string dir in dirs)
{
selectedItem.FileItems.Add(new HierarchicalModel(dir));
}
}
}
HierarchicalModel.cs
public class HierarchicalModel
{
public HierarchicalModel(string content, params HierarchicalModel[] items)
{
Content = content;
fileItems = new ObservableCollection<HierarchicalModel>();
foreach (var item in items)
{
fileItems.Add(item);
}
}
private ObservableCollection<HierarchicalModel> fileItems;
public ObservableCollection<HierarchicalModel> FileItems
{
get { return fileItems; }
set
{
if (fileItems != value)
{
fileItems = value;
}
}
}
public string Content { get; set; }
}
HierarchicalViewModel.cs
public class HierarchicalViewModel
{
public HierarchicalViewModel()
{
hierarchyItems = new ObservableCollection<HierarchicalModel>();
this.hierarchyItems.Add(
new HierarchicalModel("My Files",
new HierarchicalModel("D:\\"),
new HierarchicalModel("C:\\"))
);
}
private ObservableCollection<HierarchicalModel> hierarchyItems;
public ObservableCollection<HierarchicalModel> HierarchyItems
{
get { return hierarchyItems; }
set { hierarchyItems = value; }
}
}
The output for the above code is shown below:
Conclusion
I hope you enjoyed learning about how to load items in WPF HierarchyNavigator.
You can refer to our WPF HierarchyNavigator featuretour page to know about its other groundbreaking feature representations and documentation, to understand how to create and manipulate data.
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