Implementing Syncfusion WinUI TreeGrid

When to Use This Skill

Use this skill when you need to:

• Display hierarchical or self-relational data in a tree-structured grid
• Create data grids with parent-child relationships
• Implement expandable/collapsible rows with nested data
• Build organizational charts or employee hierarchies in grid format
• Display file system structures with grid features
• Work with category hierarchies, bill of materials, or nested classifications
• Need advanced grid features (sorting, filtering, editing) on tree-structured data
• Visualize multi-level data with column-based representation

Component Overview

The Syncfusion® WinUI TreeGrid (SfTreeGrid) is a data-oriented control that displays self-relational or hierarchical data in a tree structure with grid capabilities. It combines the tree view's expandable/collapsible navigation with the data grid's rich feature set.

Control Name: SfTreeGrid
Namespace: Syncfusion.UI.Xaml.TreeGrid
NuGet Package: Syncfusion.Grid.WinUI
Platform: WinUI 3 (Windows App SDK)

Key Capabilities

• Data Binding: Self-relational and nested collection support
• Columns: 8 built-in column types with auto-generation
• Editing: Built-in editors for all column types with validation
• Sorting: Single and multi-column sorting
• Filtering: Excel-inspired filter UI
• Selection: Row and cell selection modes
• Node Features: Checkboxes, load-on-demand, expand/collapse
• Row Operations: Drag-and-drop, merge cells
• Data Operations: Clipboard operations, Excel export
• Styling: Conditional styling, custom templates
• Advanced: Context menus, tooltips, MVVM support

Documentation and Navigation Guide

Getting Started

📄 Read: references/getting-started.md

• Creating WinUI TreeGrid application setup
• NuGet package installation (Syncfusion.Grid.WinUI)
• Namespace imports and basic initialization
• First TreeGrid with minimal XAML/C# code
• Quick render verification

Data Binding

📄 Read: references/data-binding.md

• Binding self-relational data (ParentPropertyName, ChildPropertyName)
• SelfRelationRootValue configuration for root nodes
• Binding nested collections (hierarchical objects)
• Creating data models and ViewModels
• ItemsSource binding patterns
• Tree structure formation examples

Columns and Column Types

📄 Read: references/columns.md

• 8 built-in column types (Text, Numeric, Date, Time, CheckBox, ComboBox, Hyperlink, Template)
• Auto-generating columns vs manual definition
• AutoGeneratingColumn event for customization
• Column type selection based on data types
• TreeGridColumn base class and properties

Column Configuration

📄 Read: references/column-configuration.md

• Column sizing and width modes (Auto, Star, Fill)
• Header customization and formatting
• MappingName for data binding
• Column visibility and ordering
• Frozen columns for fixed display
• Cell and edit templates

Editing and Validation

📄 Read: references/editing.md

• Enabling editing (AllowEditing property)
• Column-level editing control
• Edit mode configuration
• CurrentCellBeginEdit and CurrentCellEndEdit events
• Data validation during editing
• Programmatic editing operations
• Custom editor templates

Selection

📄 Read: references/selection.md

• Selection modes (Single, Multiple, Extended, None)
• Row selection vs cell selection (SelectionUnit)
• SelectionChanging and SelectionChanged events
• Programmatic selection APIs
• SelectedItem, SelectedItems properties
• Keyboard navigation patterns

Sorting and Filtering

📄 Read: references/sorting-filtering.md

• Single and multi-column sorting
• SortColumnDescriptions collection
• SortColumnChanging/Changed events
• Custom sorting logic
• Excel-inspired filter UI (AllowFiltering)
• FilterChanging/Changed events
• Programmatic filtering with predicates
• Filter customization

Row Operations

📄 Read: references/row-operations.md

• Row height customization
• Row drag-and-drop functionality
• Drag-drop events and validation
• Merge cells feature
• Cell merging configuration
• Conditional row styling
• Row validation rules

Node Features

📄 Read: references/node-features.md

• Node checkboxes for selection
• Recursive checking behavior
• NodeCheckStateChanging/Changed events
• Load-on-demand (lazy loading child nodes)
• LoadOnDemandCommand
• HasChildNodes property
• Dynamic child population

Data Operations

📄 Read: references/data-operations.md

• Clipboard operations (copy/paste)
• CopyOption property configuration
• CopyGridCellContent event
• Export to Excel functionality
• ExcelExportingOptions
• Exporting selected items
• Export customization and formatting

Styling and Customization

📄 Read: references/styling-customization.md

• Conditional styling based on data
• Cell and row styling
• QueryCellStyle and QueryRowStyle events
• GridLines customization
• GridLinesVisibility property
• UI customization and templates
• Theme integration

Advanced Features

📄 Read: references/advanced-features.md

• Context flyout menus
• Custom context menu items
• Tooltips for cells and headers
• Custom tooltip templates
• MVVM pattern support
• Commands and data binding
• Helper methods and utilities
• Performance optimization techniques

Quick Start Example

Self-Relational Data

<Window
    x:Class="TreeGridDemo.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:treeGrid="using:Syncfusion.UI.Xaml.TreeGrid">
    
    <Window.DataContext>
        <local:ViewModel/>
    </Window.DataContext>
    
    <Grid>
        <treeGrid:SfTreeGrid x:Name="treeGrid"
                            ItemsSource="{Binding Employees}"
                            ParentPropertyName="ID"
                            ChildPropertyName="ReportsTo"
                            SelfRelationRootValue="-1"
                            AutoExpandMode="RootNodesExpanded" />
    </Grid>
</Window>

public class EmployeeInfo
{
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Title { get; set; }
    public double Salary { get; set; }
    public int ReportsTo { get; set; }
}

public class ViewModel
{
    public ObservableCollection<EmployeeInfo> Employees { get; set; }
    
    public ViewModel()
    {
        Employees = new ObservableCollection<EmployeeInfo>
        {
            new EmployeeInfo { ID = 1, FirstName = "John", LastName = "Doe", 
                              Title = "CEO", Salary = 200000, ReportsTo = -1 },
            new EmployeeInfo { ID = 2, FirstName = "Jane", LastName = "Smith", 
                              Title = "Manager", Salary = 120000, ReportsTo = 1 },
            new EmployeeInfo { ID = 3, FirstName = "Bob", LastName = "Johnson", 
                              Title = "Developer", Salary = 80000, ReportsTo = 2 }
        };
    }
}

Nested Collection Data

public class PersonInfo
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public double Salary { get; set; }
    public ObservableCollection<PersonInfo> Children { get; set; }
}

<treeGrid:SfTreeGrid x:Name="treeGrid"
                    ItemsSource="{Binding PersonDetails}"
                    ChildPropertyName="Children" />

Common Patterns

Self-Relational Data Structure

Use when data objects reference each other via ID/ParentID:

// Each employee has an ID and ReportsTo (parent ID)
ParentPropertyName = "ID"
ChildPropertyName = "ReportsTo"
SelfRelationRootValue = -1  // Root nodes have ReportsTo = -1

Nested Collection Structure

Use when data objects contain child collections:

// Each person has a Children property containing child objects
ChildPropertyName = "Children"
// No ParentPropertyName needed

Column Auto-Generation Control

<!-- Auto-generate columns from data properties -->
<treeGrid:SfTreeGrid AutoGenerateColumns="True" />

<!-- Define columns manually for full control -->
<treeGrid:SfTreeGrid AutoGenerateColumns="False">
    <treeGrid:SfTreeGrid.Columns>
        <treeGrid:TreeGridTextColumn MappingName="FirstName" HeaderText="First Name"/>
        <treeGrid:TreeGridNumericColumn MappingName="Salary" DisplayNumberFormat="C2"/>
    </treeGrid:SfTreeGrid.Columns>
</treeGrid:SfTreeGrid>

MVVM Data Binding

public class ViewModel : INotifyPropertyChanged
{
    private ObservableCollection<DataModel> _items;
    
    public ObservableCollection<DataModel> Items
    {
        get => _items;
        set
        {
            _items = value;
            OnPropertyChanged();
        }
    }
    
    public event PropertyChangedEventHandler PropertyChanged;
    
    protected void OnPropertyChanged([CallerMemberName] string name = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    }
}

Expand/Collapse Control

// Auto-expand modes
AutoExpandMode = AutoExpandMode.AllNodesExpanded;  // All expanded
AutoExpandMode = AutoExpandMode.RootNodesExpanded; // Only root
AutoExpandMode = AutoExpandMode.None;              // All collapsed

// Programmatic control
treeGrid.ExpandNode(node);
treeGrid.CollapseNode(node);
treeGrid.ExpandAllNodes();
treeGrid.CollapseAllNodes();

Key Properties

Data Binding Properties

• ItemsSource - Data source (IEnumerable)

  • When: Always required for data binding
  • Why: Provides the data to display

• ChildPropertyName - Property containing child collection or parent reference

  • When: Required for all tree structures
  • Why: Defines the tree relationship

• ParentPropertyName - Property containing unique identifier (self-relational only)

  • When: Only for self-relational data
  • Why: Identifies parent nodes

• SelfRelationRootValue - Value indicating root nodes (self-relational only)

  • When: With self-relational data
  • Why: Identifies which nodes are roots (default: null)

Display Properties

• AutoGenerateColumns - Auto-create columns from properties (default: true)

  • When: Set false for manual column control
  • Why: Automatic vs explicit column definition

• AutoExpandMode - Initial expand state

  • When: Control initial tree visibility
  • Why: User experience for data exploration

• ColumnWidthMode - How columns calculate width

  • When: Control column sizing behavior
  • Why: Auto, Star, or fixed widths

Feature Properties

• AllowEditing - Enable cell editing (default: false)

  • When: Editable grid needed
  • Why: In-place data modification

• AllowFiltering - Enable filter UI (default: false)

  • When: Large datasets need filtering
  • Why: Excel-style data filtering

• SelectionMode - Row/cell selection type

  • When: Control selection behavior
  • Why: Single, Multiple, Extended, or None

• SelectionUnit - Select rows or cells

  • When: Define selection granularity
  • Why: Row vs cell-level selection

Common Use Cases

Organizational Hierarchy

Display company structure with employees reporting to managers:

ParentPropertyName = "EmployeeID"
ChildPropertyName = "ManagerID"

File System Browser

Show folders and files in tree structure:

ChildPropertyName = "SubItems"  // Nested collection

Category Management

Display product categories with subcategories:

ChildPropertyName = "SubCategories"

Bill of Materials (BOM)

Show product assemblies and components:

ParentPropertyName = "PartID"
ChildPropertyName = "ParentPartID"

Task/Project Management

Display tasks with subtasks:

ChildPropertyName = "SubTasks"

Geographic Hierarchies

Show countries > states > cities:

ChildPropertyName = "Children"

Troubleshooting

Tree Structure Not Forming

• Verify ParentPropertyName and ChildPropertyName are set correctly
• Check SelfRelationRootValue matches your data's root indicator
• Ensure data relationships are properly defined

Columns Not Appearing

• Set AutoGenerateColumns = True, or define columns manually
• Check MappingName matches property names exactly (case-sensitive)
• Verify data source is bound to ItemsSource

Performance Issues with Large Datasets

• Enable load-on-demand for lazy loading
• Use on-demand mode to defer child node loading
• Consider data virtualization for very large trees

Editing Not Working

• Set AllowEditing = True on TreeGrid
• Check column-level AllowEditing property
• Ensure data objects implement INotifyPropertyChanged

Next Steps: Read the getting-started guide, then explore feature-specific references based on your requirements.