Toolkit2/Toolkit.Foundation.Avalonia/Extensions/EventArgsExtensions.cs

using Avalonia.Data.Converters;
using System.Globalization;

namespace Toolkit.Foundation.Avalonia
{
    public static class EventArgsExtensions
    {
        public static dynamic? GetEventArguments(this EventArgs args, string? path, IValueConverter? converter, object? converterParameter)
        {
            return !string.IsNullOrWhiteSpace(path) ? GetEventArgsPropertyPathValue(args, path) : converter is not null ? converter.Convert(args, typeof(object), converterParameter, CultureInfo.CurrentCulture) : (dynamic)args;
        }

        private static object GetEventArgsPropertyPathValue(object args, string path)
        {
            object? value = args;
            if (path is { })
            {
                value = PropertyPathHelper.GetValue(args, path);
            }

            return value;
        }
    }
}