Implementing.NET MAUI ComboBox
The Syncfusion.NET MAUI ComboBox (SfComboBox) is a powerful selection control that allows users to type a value or choose an option from a list of predefined options. It combines the functionality of a dropdown list with an editable text box, supporting data binding, filtering, searching, single/multiple selection, and extensive customization options.
When to Use This Skill
Use this skill when the user needs to:
- Implement dropdown selection controls with editable or non-editable text input
- Enable searchable dropdowns with filtering and auto-complete functionality
- Support multiple selection modes with token or delimiter display
- Bind data from collections to dropdown lists with custom display formatting
- Apply custom filtering logic including AI-powered smart search
- Customize dropdown UI with headers, footers, item templates, and styling
- Highlight matched text during search operations
- Implement load-more functionality for large datasets
- Create accessible selection controls with proper automation support
Component Overview
Key Capabilities:
- Editable & Non-Editable Modes: Toggle between allowing free text input or dropdown-only selection
- Single & Multiple Selection: Support for single item or multi-item selection with token/delimiter display
- Filtering & Searching: Built-in text filtering with StartsWith/Contains modes and custom filter logic
- Data Binding: Bind to any IEnumerable source with DisplayMemberPath and TextMemberPath
- UI Customization: Extensive styling options for dropdown, items, tokens, headers, footers
- Smart Features: AI-powered search, text highlighting, load-more, auto-sizing
- Events & Methods: Rich event model for selection changes, dropdown state, and user interactions
Documentation and Navigation Guide
Getting Started
📄 Read: references/getting-started.md
- Installation and NuGet package setup (Syncfusion.Maui.Inputs)
- Registering Syncfusion Core handler (ConfigureSyncfusionCore)
- Basic ComboBox implementation in XAML and C#
- Data binding with ItemsSource, DisplayMemberPath, TextMemberPath
- Minimal working example
Editing Modes
📄 Read: references/editing-modes.md
- IsEditable property for editable/non-editable modes
- IsClearButtonVisible for clear button control
- Text property for getting/setting input text
- CursorPosition management
Selection
📄 Read: references/selection.md
- Single selection (SelectedItem, SelectedIndex)
- Multiple selection (SelectionMode, SelectedItems)
- Multi-selection display modes (Token, Delimiter)
- TokensWrapMode (Wrap, None)
- SelectedValue and SelectedValuePath
- SelectionChanging and SelectionChanged events
- Programmatic selection and Clear method
Filtering
📄 Read: references/filtering.md
- Enable filtering with IsFilteringEnabled
- Filter modes (StartsWith, Contains)
- Custom filtering with IComboBoxFilterBehavior
- Implementing GetMatchingIndexes for custom filter logic
- MinimumPrefixCharacters constraint
Searching
📄 Read: references/searching.md
- TextSearchMode configuration (StartsWith, Contains)
- Search based on DisplayMemberPath and TextMemberPath
- Edit mode searching behavior
- Prefix characters constraint (MinimumPrefixCharacters)
UI Customization
📄 Read: references/ui-customization.md
- Placeholder and colors
- Clear button and dropdown icon customization
- Border styling (Stroke, ShowBorder)
- MaxDropDownHeight configuration
- ItemTemplate and DataTemplateSelector for custom item rendering
- Dropdown styling (Background, Stroke, StrokeThickness, CornerRadius, Shadow)
- Dropdown item styling (Font, Color, Height, Padding)
- DropDownPlacement (Top, Bottom, Auto, None)
- DropDownButtonSettings customization
- Token item styling
- Text alignment and cursor position
- ReturnType for keyboard behavior
- ShowSuggestionsOnFocus
- AutomationId support for UI testing
Header and Footer
📄 Read: references/header-footer.md
- Adding header view with ShowDropDownHeaderView
- Adding footer view with ShowDropDownFooterView
- Custom templates for headers and footers
- Height configuration
Text Highlighting
📄 Read: references/highlighting-text.md
- TextHighlightMode (FirstOccurrence, MultipleOccurrence)
- Customizing highlight color and font attributes
- Highlighting in StartsWith and Contains modes
Advanced Features
📄 Read: references/advanced-features.md
- AutoSizing with EnableAutoSize
- NoResultsFoundText and NoResultsFoundTemplate
- Load-more functionality (MaximumSuggestion, LoadMoreText, LoadMoreTemplate)
- IsDropDownOpen for programmatic control
- ReturnCommand and ReturnCommandParameter
- Liquid Glass Effect (EnableLiquidGlassEffect)
Events and Methods
📄 Read: references/events-and-methods.md
- SelectionChanging event (with Cancel option)
- SelectionChanged event (AddedItems, RemovedItems)
- ValueChanged event (OldValue, NewValue)
- Completed event
- DropDownOpening, DropDownOpened, DropDownClosed events
- ClearButtonClicked event
- LoadMoreButtonTapped event
- Clear() method
AI-Powered Smart Searching
📄 Read: references/ai-smart-searching.md
- Integrating Azure OpenAI for intelligent search
- Implementing IComboBoxFilterBehavior for AI filtering
- Prompt engineering for accurate results
- Async filtering with CancellationToken
- Fallback mechanisms (Soundex, Levenshtein algorithms)