XAML開発者チップ：複合コンバーター

 using System; using System.Globalization; using System.Windows.Data; using Aero.Converters.Patterns; namespace Aero.Converters { public class InlineConverter : IInlineConverter, ICompositeConverter { public IValueConverter PostConverter { get; set; } public object PostConverterParameter { get; set; } public event EventHandler<ConverterEventArgs> Converting; public event EventHandler<ConverterEventArgs> ConvertingBack; public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var args = new ConverterEventArgs(value, targetType, parameter, culture); var handler = Converting; if (handler != null) handler(this, args); return PostConverter == null ? args.ConvertedValue : PostConverter.Convert(args.ConvertedValue, targetType, PostConverterParameter, culture); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { var args = new ConverterEventArgs(value, targetType, parameter, culture); var handler = ConvertingBack; if (handler != null) handler(this, args); return PostConverter == null ? args.ConvertedValue : PostConverter.ConvertBack(args.ConvertedValue, targetType, PostConverterParameter, culture); } } } 

 using System; using System.Globalization; using System.Linq; using System.Windows; using System.Windows.Data; using System.Windows.Markup; using Aero.Converters.Patterns; namespace Aero.Converters { [ContentProperty("Cases")] public class SwitchConverter : DependencyObject, ISwitchConverter, ICompositeConverter { public static readonly DependencyProperty DefaultProperty = DependencyProperty.Register( "Default", typeof(object), typeof(SwitchConverter), new PropertyMetadata(CaseSet.UndefinedObject)); public SwitchConverter() { Cases = new CaseSet(); } public object Default { get { return GetValue(DefaultProperty); } set { SetValue(DefaultProperty, value); } } public CaseSet Cases { get; private set; } public bool TypeMode { get; set; } public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (TypeMode) value = value == null ? null : value.GetType(); var pair = Cases.FirstOrDefault(p => Equals(p.Key, value) || SafeCompareAsStrings(p.Key, value)); var result = pair == null ? Default : pair.Value; value = result == CaseSet.UndefinedObject ? value : result; return PostConverter == null ? value : PostConverter.Convert(value, targetType, PostConverterParameter, culture); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { if (TypeMode) value = value == null ? null : value.GetType(); var pair = Cases.FirstOrDefault(p => Equals(p.Value, value) || SafeCompareAsStrings(p.Value, value)); value = pair == null ? Default : pair.Key; return PostConverter == null ? value : PostConverter.ConvertBack(value, targetType, PostConverterParameter, culture); } private static bool SafeCompareAsStrings(object a, object b) { if (a == null && b == null) return true; if (a == null || b == null) return false; return string.Compare(a.ToString(), b.ToString(), StringComparison.OrdinalIgnoreCase) == 0; } public IValueConverter PostConverter { get; set; } public object PostConverterParameter { get; set; } } }