Data Type Converters

These converters handle numeric data types, nullable values, and type conversions for form inputs and data binding.

NullableDoubleConverter

• Namespace: GenHub.Infrastructure.Converters
• Purpose: Converts between nullable doubles and strings with graceful null handling
• Features:
  • Double to string conversion with culture support
  • String to double conversion with fallback defaults
  • Handles empty/whitespace strings safely
• Return Type: string or double

Numeric Input Binding

<!-- Bind double property to TextBox -->
<TextBox Text="{Binding ScaleFactor, Converter={StaticResource NullableDoubleConverter}}" />

With Default Parameter

<!-- Use ConverterParameter for default value -->
<TextBox Text="{Binding Opacity, Converter={StaticResource NullableDoubleConverter},
                       ConverterParameter='1.0'}" />

Culture-Aware Formatting

<!-- Automatically formats with current culture -->
<TextBlock Text="{Binding Price, Converter={StaticResource NullableDoubleConverter}}" />

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NullableIntConverter

• Namespace: GenHub.Infrastructure.Converters
• Purpose: Converts between nullable integers and strings with graceful null handling
• Features:
  • Integer to string conversion
  • String to integer conversion with fallback defaults
  • Handles empty/whitespace strings safely
• Return Type: string or int

Integer Input Binding

<!-- Bind int property to TextBox -->
<TextBox Text="{Binding PortNumber, Converter={StaticResource NullableIntConverter}}" />

With Default Parameter (Integer)

<!-- Use ConverterParameter for default value -->
<TextBox Text="{Binding MaxRetries, Converter={StaticResource NullableIntConverter},
                       ConverterParameter='3'}" />

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StringToIntConverter

• Namespace: GenHub.Infrastructure.Converters
• Purpose: Converts strings to integers for CommandParameter binding scenarios
• Features:
  • String to integer conversion
  • Integer to string conversion (ConvertBack)
  • Safe fallback to 0 for invalid inputs
• Return Type: int or string

Command Parameter Binding

<!-- Convert string command parameter to int -->
<Button Command="{Binding SelectItemCommand}"
        CommandParameter="{Binding ItemId, Converter={StaticResource StringToIntConverter}}" />

Numeric Input Validation

<!-- Bind string input to integer property -->
<TextBox Text="{Binding Quantity, Converter={StaticResource StringToIntConverter}}" />

Real Usage Patterns

<!-- Numeric input with culture-aware formatting -->
<TextBox Text="{Binding ScaleFactor, Converter={StaticResource NullableDoubleConverter}}" />

<!-- Integer input with validation -->
<TextBox Text="{Binding PortNumber, Converter={StaticResource NullableIntConverter}}" />

<!-- Command parameter conversion -->
<Button Command="{Binding SelectItemCommand}"
        CommandParameter="{Binding ItemId, Converter={StaticResource StringToIntConverter}}" />

<!-- Form validation with defaults -->
<TextBox Text="{Binding MaxRetries, Converter={StaticResource NullableIntConverter}, ConverterParameter='3'}" />

Real Usage in Configuration Scenarios

<!-- Settings with safe defaults -->
<NumericUpDown Value="{Binding TimeoutSeconds, Converter={StaticResource NullableIntConverter}, ConverterParameter='30'}" />

<!-- Percentage inputs -->
<TextBox Text="{Binding Opacity, Converter={StaticResource NullableDoubleConverter}, ConverterParameter='1.0'}" />

<!-- ID-based selections -->
<ComboBox SelectedValue="{Binding SelectedId, Converter={StaticResource StringToIntConverter}}" />