public static IEnumerable<T> Peek<T>(this IEnumerable<T> source, Action<T> action)
        {
            if (source == null) throw new ArgumentNullException(nameof(source));
            if (action == null) throw new ArgumentNullException(nameof(action));

            return _(); IEnumerable<T> _()
            {
                foreach (var element in source)
                {
                    action(element);
                    yield return element;
                }
            }
        }

public static class MyExtensions
{
	public static IEnumerable<TResult> TrySelect<TSource, TResult, TException>(this IEnumerable<TSource> source,
																		Func<TSource, TResult> selector,
																		Action<TSource, TException> exceptionAction)
																		where TException : Exception
	{
		foreach (var s in source)
		{
			TResult result = default(TResult);
			bool success = false;
			try
			{
				result = selector(s);
				success = true;
			}
			catch (TException ex)
			{
				exceptionAction(s,ex);
			}
			if (success)
			{
				// n.b. can't yield return inside a try block
				yield return result;
			}
		}
	}
}