public void DeserializeProperty( BsonReader bsonReader, object obj, BsonPropertyMap propertyMap ) { var bsonType = bsonReader.PeekBsonType(); BsonMaxKey value; if (bsonType == BsonType.Null) { bsonReader.ReadNull(propertyMap.ElementName); value = null; } else { bsonReader.ReadMaxKey(propertyMap.ElementName); value = Bson.MaxKey; } propertyMap.Setter(obj, value); }