class Product
{
	public int ProductID { get; set; }
	public string ProductName { get; set; }
}
class FastListDataSource : IListDataSource
{
	private readonly System.Collections.Generic.IList < Product > _list;
	private readonly System.Data.IDataReader _reader;
	public FastListDataSource(System.Collections.Generic.IList < Product > list)
	{
		_list = list;
		_reader = FastMember.ObjectReader.Create(_list);
	}
	public object GetValue(string fieldName, int ordinal)
	{
		var index = fieldName.IndexOf('.');
		if (index == -1)
			return _reader.GetValue(ordinal);
		var fields = fieldName.Split('.');
		var target = _reader.GetValue(ordinal);
		for (int i = 1; i != fields.Length; i++)
			target = FastMember.ObjectAccessor.Create(target)[fields[i]];
		return target;
	}
	public int GetOrdinal(string fieldName)
	{
		var index = fieldName.IndexOf('.');
		if (index == -1)
			return _reader.GetOrdinal(fieldName);
		return _reader.GetOrdinal(fieldName.Substring(0, index));
	}
	public System.Collections.IList List => (System.Collections.IList)_list;
	public System.Data.IDataReader DataReader => _reader;
}