PowerToys/Wox/Converters/StringEmptyConverter.cs

using System;
using System.Globalization;

namespace Wox.Converters
{
    public class StringEmptyConverter : ConvertorBase<StringEmptyConverter>
    {
        public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return string.IsNullOrEmpty((string)value) ? parameter : value;
        }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }
}