NullToUnset.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
using System;
using System.Globalization;
using System.Windows;

namespace SiliconStudio.Presentation.ValueConverters
{
    /// <summary>
    /// This converter will convert a null value to <see cref="DependencyProperty.UnsetValue"/>. If the given object is not null, it will be returned as it is.
    /// </summary>
    public class NullToUnset : OneWayValueConverter<NullToUnset>
    {
        /// <inheritdoc/>
        public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value ?? DependencyProperty.UnsetValue;
        }
    }
}