FluentDataReader.cs

// remember to force exactly one evaluation of the IEnumerable through Map

public static class FluentDataReader
{
	public delegate object MapDelegate<T>(IDataReader reader);
	
	public static IEnumerable<T> Map<T> (this IDataReader reader, MapDelegate<T> mapper) where T : class
	{
		while (reader.Read())
		{
			yield return mapper(reader) as T;
		}
		
		reader.Dispose(); // this will help catch errors with trying to reuse this DataReader
	}
}