public static IEnumerable <T> FastSpool <T>(this MongoCursor <RawBsonDocument> cursor, int threads = 2)
{
var binaryReaderSettings = new BsonBinaryReaderSettings();
binaryReaderSettings.MaxDocumentSize = int.MaxValue;
var serializer = BsonSerializer.LookupSerializer(typeof(T));
return(cursor
.AsParallel().AsOrdered()
.WithExecutionMode(ParallelExecutionMode.ForceParallelism)
.WithDegreeOfParallelism(Math.Max(1, threads))
.Select(doc =>
{
using (doc)
{
return (T)serializer.Deserialize(new BsonBinaryReader(new BsonBuffer(doc.Slice, false), binaryReaderSettings),
typeof(T), null);
}
}));
}