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ValueConverterGroup.cs
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ValueConverterGroup.cs
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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
#if (NETFX || NETWPF)
using System.Windows;
using System.Windows.Data;
using System.Windows.Markup;
#elif (NETFX_CORE)
using Windows.UI.Xaml;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Markup;
#elif (XAMARIN)
using Xamarin.Forms;
#elif (MAUI)
using Microsoft.Maui;
using Microsoft.Maui.Controls;
#endif
namespace ValueConverters
{
/// <summary>
/// Value converters which aggregates the results of a sequence of converters: Converter1 >> Converter2 >> Converter3
/// The output of converter N becomes the input of converter N+1.
/// </summary>
#if (NETFX || NETWPF || XAMARIN || MAUI)
[ContentProperty(nameof(Converters))]
#elif (NETFX_CORE)
[ContentProperty(Name = nameof(Converters))]
#endif
public class ValueConverterGroup : SingletonConverterBase<ValueConverterGroup>
{
public List<IValueConverter> Converters { get; set; } = new List<IValueConverter>();
protected override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (this.Converters is IEnumerable<IValueConverter> converters)
{
#if NETFX_CORE
var language = culture?.ToString();
#else
var language = culture;
#endif
return converters.Aggregate(value, (current, converter) => converter.Convert(current, targetType, parameter, language));
}
return UnsetValue;
}
protected override object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
if (this.Converters is IEnumerable<IValueConverter> converters)
{
#if NETFX_CORE
var language = culture?.ToString();
#else
var language = culture;
#endif
return converters.Reverse<IValueConverter>().Aggregate(value, (current, converter) => converter.Convert(current, targetType, parameter, language));
}
return UnsetValue;
}
}
}