Implementing Syncfusion.NET MAUI TreeView
The Syncfusion.NET MAUI TreeView (SfTreeView) is a powerful data-oriented control for displaying hierarchical data structures such as organizational charts, file systems, nested connections, and multi-level data. It provides intuitive expand/collapse functionality, multiple selection modes, drag-and-drop support, and extensive customization options.
When to Use This Skill
Use this skill when implementing:
- Hierarchical Data Display: Organizational structures, file explorers, category trees, nested menus
- Interactive Tree Navigation: Expandable/collapsible nodes, multi-level browsing
- Data Binding Scenarios: Bound mode with ItemsSource or unbound mode with manual nodes
- Selection Requirements: Single, multiple, or extended selection in tree structures
- Custom Tree UI: Templated nodes, custom expanders, styled tree items
- Advanced Tree Features: Drag-drop reordering, filtering, sorting, load on demand
- MVVM Applications: TreeView with commands, data binding, and ViewModel patterns
Component Overview
Key Capabilities:
- Enhanced performance with optimized view-reusing strategy
- Bound and unbound data modes
- Multiple selection modes with keyboard navigation
- Item and expander templating
- Expand/collapse with animations
- Drag-and-drop node reordering
- Filtering and sorting support
- Load on demand for large datasets
- MVVM pattern support
- RTL (right-to-left) support
- Customizable appearance and styling
Documentation and Navigation Guide
Getting Started
📄 Read: references/getting-started.md
When to read: Setting up TreeView for the first time, initial configuration, basic implementation
Covers:
- Installing Syncfusion.Maui.TreeView NuGet package
- Registering Syncfusion handler in MauiProgram.cs
- Creating a basic TreeView control
- First working example
- Running and testing the application
Data Binding and Population
📄 Read: references/data-binding.md
When to read: Populating TreeView with data, choosing between bound/unbound modes, hierarchical data structures
Covers:
- Bound vs unbound modes comparison
- Creating nodes without data source (unbound mode with TreeViewNode)
- Data binding with ItemsSource (bound mode)
- Defining hierarchical data models
- Using HierarchyPropertyDescriptors for complex hierarchies
- ChildPropertyName configuration
- Self-relational data structures
- ObservableCollection integration
Selection
📄 Read: references/selection.md
When to read: Implementing node selection, handling selection events, customizing selection appearance
Covers:
- Selection modes: Single, SingleDeselect, Multiple, Extended, None
- SelectedItem, CurrentItem, and SelectedItems properties
- SelectionChanging and SelectionChanged events
- SelectionBackground and SelectionForeground customization
- Keyboard navigation (WinUI, MacCatalyst)
- Programmatic selection
- Selection validation and cancellation
Node Expansion and Collapse
📄 Read: references/expand-collapse.md
When to read: Configuring expand/collapse behavior, handling expansion events, initial node states
Covers:
- AutoExpandMode options (None, AllNodes, RootNodes, specific levels)
- ExpandActionTarget (Expander, Node)
- Programmatic expand/collapse methods
- NodeExpanding and NodeCollapsing events
- IsExpanded property for individual nodes
- Expand/collapse animations
- Event cancellation and validation
Templating and Customization
📄 Read: references/templating.md
When to read: Customizing node appearance, creating custom expanders, designing tree item UI
Covers:
- ItemTemplate for node content customization
- ExpanderTemplate for custom expand/collapse icons
- ItemTemplateContextType (Node vs Data binding context)
- DataTemplate creation and binding
- Mixing images, text, and custom controls
- Template selectors for conditional templates
- Advanced templating patterns
Drag and Drop
📄 Read: references/drag-and-drop.md
When to read: Enabling node reordering, implementing drag-drop functionality, customizing drag behavior
Covers:
- Enabling AllowDragging property
- DragStarting, DragOver, and Drop events
- Reordering nodes within the tree
- Drag restrictions and validation
- Visual feedback during drag operations
- Custom drag templates
- Handling drag between different levels
Filtering
📄 Read: references/filtering.md
When to read: Filtering tree nodes, implementing search functionality, showing/hiding nodes based on criteria
Covers:
- FilterLevel property (Root, All, Extended)
- Filter predicates and expressions
- Filtering hierarchical data
- Clearing and updating filters
- Dynamic filtering with ObservableCollection
- Performance considerations
Sorting
📄 Read: references/sorting.md
When to read: Sorting tree nodes, custom sort logic, multi-level sorting
Covers:
- SortComparer configuration
- Sorting hierarchical data at each level
- Custom IComparer implementations
- Ascending/descending order
- Sorting with data binding
- Performance optimization for large trees
Styling and Appearance
📄 Read: references/styling-appearance.md
When to read: Customizing visual appearance, adjusting spacing and indentation, applying themes
Covers:
- Item height customization (ItemHeight property)
- Indentation settings for nested levels
- Liquid glass effect styling
- RTL (right-to-left) support
- Background and foreground colors
- Border and padding customization
- Theme integration
MVVM Support
📄 Read: references/mvvm-support.md
When to read: Implementing TreeView with MVVM pattern, using commands and data binding
Covers:
- ViewModel setup for TreeView
- INotifyPropertyChanged implementation
- Command binding for node actions
- Data-bound ItemsSource
- Selection binding in MVVM
- Event-to-command patterns
- Best practices for MVVM architecture
Checkbox Support
📄 Read: references/checkbox-support.md
When to read: Adding checkboxes to nodes, handling checked/unchecked states, recursive checkbox modes
Covers:
- Checkbox in bound mode with CheckedItems
- Checkbox in unbound mode with IsChecked property
- CheckBoxMode property (Recursive, Cascade, None)
- Working with checked items collection
- Programmatic checkbox state management
- Best practices for checkbox implementation
Load on Demand
📄 Read: references/load-on-demand.md
When to read: Implementing lazy loading of child nodes, handling large datasets, API-based hierarchies
Covers:
- Load on Demand implementation with LoadOnDemandCommand
- ShowExpanderAnimation for loading feedback
- PopulateChildNodes method
- Avoiding duplicate loading
- API-based lazy loading patterns
- Performance optimization with lazy loading
Scrolling and Navigation
📄 Read: references/scrolling-navigation.md
When to read: Programmatic scrolling, bringing items into view, keyboard navigation
Covers:
- BringIntoView method with all overloads
- Scroll position options (Start, Center, End, MakeVisible)
- Scroll animation control
- Horizontal scrolling configuration
- Scrollbar visibility control
- Keyboard navigation (arrow keys, Tab)
- Events (Loaded, ItemTapped, ItemDoubleTapped, ItemRightTapped)
Item Height Customization
📄 Read: references/item-height-customization.md
When to read: Customizing node heights, dynamic sizing, content-based measurements
Covers:
- Static ItemHeight property
- QueryNodeSize event for per-item heights
- NodeSizeMode property (Dynamic vs None)
- GetActualNodeHeight method
- Dynamic height calculation
- Performance considerations
Empty View
📄 Read: references/empty-view.md
When to read: Displaying empty states, customizing no-data UI, template-based empty views
Covers:
- Display string message when empty
- Display custom views in empty state
- EmptyViewTemplate for templated empty views
- Trigger conditions for empty view
- Binding in empty view templates
- Search/filter empty state patterns
Advanced Features
📄 Read: references/advanced-features.md
When to read: Implementing load on demand, performance optimization, advanced TreeView operations
Covers:
- Load on demand for large datasets
- Empty view customization (EmptyView property)
- Scrolling configuration and optimization
- Working with TreeViewNode programmatically
- Checkbox support
- Events
Troubleshooting
📄 Read: references/troubleshooting.md
When to read: Debugging issues, resolving errors, optimization problems
Covers:
- Common TreeView issues and solutions
- Performance troubleshooting
- Data binding problems
- Selection not working
- Template rendering issues
- Expand/collapse problems
- Memory leaks and optimization
- Best practices checklist