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Interface IValueConverter - Xamarin.Android API Reference | Syncfusion

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    Interface IValueConverter

    Namespace: Syncfusion.Data
    Assembly: Syncfusion.Linq.Android.dll
    Syntax
    public interface IValueConverter

    Methods

    Convert(Object, Type, Object, CultureInfo)

    Convert a value. Called when moving a value from source to target.

    Declaration
    object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    Parameters
    Type Name Description
    System.Object value

    value as produced by source binding

    System.Type targetType

    target type

    System.Object parameter

    converter parameter

    System.Globalization.CultureInfo culture

    culture information

    Returns
    Type Description
    System.Object

    Converted value.

    System.Windows.DependencyProperty.UnsetValue may be returned to indicate that the converter produced no value and that the fallback (if available) or default value should be used instead.

    Binding.DoNothing may be returned to indicate that the binding should not transfer the value or use the fallback or default value.

    Remarks

    The data binding engine does not catch exceptions thrown by a user-supplied converter. Thus any exception thrown by Convert, or thrown by methods it calls and not caught by the Convert, will be treated as a runtime error (i.e. a crash). Convert should handle anticipated problems by returning DependencyProperty.UnsetValue.

    ConvertBack(Object, Type, Object, CultureInfo)

    Convert back a value. Called when moving a value from target to source. This should implement the inverse of Convert.

    Declaration
    object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    Parameters
    Type Name Description
    System.Object value

    value, as produced by target

    System.Type targetType

    target type

    System.Object parameter

    converter parameter

    System.Globalization.CultureInfo culture

    culture information

    Returns
    Type Description
    System.Object

    Converted back value.

    Binding.DoNothing may be returned to indicate that no value should be set on the source property.

    System.Windows.DependencyProperty.UnsetValue may be returned to indicate that the converter is unable to provide a value for the source property, and no value will be set to it.

    Remarks

    The data binding engine does not catch exceptions thrown by a user-supplied converter. Thus any exception thrown by ConvertBack, or thrown by methods it calls and not caught by the ConvertBack, will be treated as a runtime error (i.e. a crash). ConvertBack should handle anticipated problems by returning DependencyProperty.UnsetValue.

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