| name | syncfusion-winui-numberbox |
| description | Learn to implement Syncfusion WinUI NumberBox (SfNumberBox) control for numeric input with validation, custom formatting, and value restrictions. Use this skill when you need numeric input fields with currency, percentage, or decimal formatting in WinUI applications. |
| metadata | {"author":"Syncfusion Inc","version":"34.1.29"} |
Implementing WinUI NumberBox
The Syncfusion WinUI NumberBox (SfNumberBox) is an advanced numeric input control that provides validation, custom formatting, and interactive features for entering numeric values.
When to Use This Component
Use NumberBox when you need to:
- Accept numeric input with validation
- Display values in currency, percentage, or decimal formats
- Restrict input to a specific range (min/max)
- Provide UpDown buttons for value adjustment
- Support multiple numeric data types (double, decimal, int, long, etc.)
- Enable keyboard and mouse wheel value changes
- Handle watermark text and placeholder values
Component Overview
The NumberBox control combines these key features:
- Numeric Validation - Automatically validates and formats input
- Multiple Formats - Currency (C), Percentage (P), Decimal (N), and custom formats
- Value Control - Min/max bounds and null handling
- Interactive Adjustment - UpDown buttons, keyboard arrows, mouse scrolling
- Data Type Support - Double, Decimal, Float, Long, Int, UInt, Byte, SByte
- Accessibility - Full keyboard navigation and screen reader support
Documentation and Navigation Guide
Getting Started
📄 Read: references/getting-started.md
- Installation and NuGet package setup
- Adding NumberBox in XAML and C#
- Basic control creation
- Supported data types (Double, Decimal, Float, Long, Int, UInt, Byte, SByte)
- Placeholder text and description properties
- Header customization
- Value editing and validation on Enter/focus loss
UpDown Button & Value Adjustment
📄 Read: references/updown-button.md
- UpDown button placement modes (Hidden, Inline, Compact)
- SmallChange for keyboard/mouse increment
- LargeChange for Page Up/Page Down increment
- TextBox visibility control
- Keyboard support (Arrow, Page keys)
- Mouse scrolling for value changes
Value Formatting
📄 Read: references/formatting.md
- CustomFormat property (C2, P2, N3 formats)
- NumberFormatter classes (CurrencyFormatter, PercentFormatter, DecimalFormatter)
- Currency formatting with region/culture support
- Percentage and decimal formatting
- Integer and fractional digit control
- Culture-specific formatting
- Handling both CustomFormat and NumberFormatter
Value Restrictions & Validation
📄 Read: references/restrictions.md
- AllowNull property for null value handling
- Minimum and Maximum bounds
- Range validation behavior
- IsEditable property for read-only mode
- Text editing restrictions
- Default value fallback when AllowNull=false
Quick Start Example
Basic NumberBox Setup
XAML:
<editors:SfNumberBox
x:Name="priceInput"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Header="Price"
Value="0"
Minimum="0"
Maximum="999.99"
CustomFormat="C2" />
C#:
SfNumberBox priceInput = new SfNumberBox();
priceInput.Header = "Price";
priceInput.Value = 0;
priceInput.Minimum = 0;
priceInput.Maximum = 999.99;
priceInput.CustomFormat = "C2";
priceInput.ValueChanged += (s, e) => {
var newValue = e.NewValue;
var oldValue = e.OldValue;
};
Common Implementation Patterns
Pattern 1: Currency Input Field
When: User needs to enter monetary amounts
<editors:SfNumberBox
Header="Amount"
Value="0"
CustomFormat="C2"
Minimum="0"
Maximum="10000"
AllowNull="False"
SmallChange="1" />
Pattern 2: Percentage Input Field
When: User needs to enter percentage values
<editors:SfNumberBox
Header="Discount"
Value="0"
CustomFormat="P2"
Minimum="0"
Maximum="100"
SmallChange="5" />
Pattern 3: Quantity Selector with UpDown Buttons
When: User selects discrete quantities
<editors:SfNumberBox
Header="Quantity"
Value="1"
Minimum="1"
Maximum="100"
UpDownPlacementMode="Inline"
SmallChange="1"
AllowNull="False" />
Pattern 4: Read-Only Display with Adjustment
When: Display value with UpDown buttons but prevent typing
<editors:SfNumberBox
Value="50"
IsEditable="False"
UpDownPlacementMode="Inline"
SmallChange="1" />
Pattern 5: High-Precision Decimal Input
When: Financial or scientific calculations needed
<editors:SfNumberBox
ValueType="Decimal"
Value="1234.56"
CustomFormat="0.00"
Minimum="0"
Maximum="999999.99" />
Key Properties Quick Reference
Value Properties
- Value - Current numeric value
- ValueType - Data type (Double, Decimal, Float, Long, Int, UInt, Byte, SByte)
- AllowNull - Permit null/empty values (default: True)
Formatting Properties
- CustomFormat - Format string (C2=currency, P2=percent, N3=decimal)
- NumberFormatter - Advanced formatter objects
- Culture - Culture-specific formatting
Range Properties
- Minimum - Lowest allowed value
- Maximum - Highest allowed value
Display Properties
- Header - Label text
- HeaderTemplate - Custom header layout
- PlaceholderText - Watermark when empty
- Description - Help text below control
- ShowClearButton - Show/hide clear button
Interaction Properties
- UpDownPlacementMode - Button position (Hidden, Inline, Compact)
- SmallChange - Increment for arrows/scrolling (default: 1)
- LargeChange - Increment for Page keys (default: 10)
- IsEditable - Allow text input (default: True)
- TextBoxVisibility - Show/hide text box
Events
- ValueChanged - Fires when value changes after validation
Common Use Cases
- Price Input - Use C2 format, set realistic min/max bounds
- Age Input - Use int ValueType, set 0-150 range
- Discount Field - Use P2 format, set 0-100 range
- Quantity Picker - Use Inline UpDown, set practical limits
- Percentage Calculation - Use P2 format with appropriate decimals
- Payment Amount - Use C2 format with currency rules
- Decimal Precision - Use Decimal type for financial data
Installation
NuGet Package
Install-Package Syncfusion.Editors.WinUI
XAML Namespace
xmlns:editors="using:Syncfusion.UI.Xaml.Editors"
Next Steps
