https://mongodb.github.io/mongo-csharp-driver/2.13/apidocs/html/Properties_T_MongoDB_Driver_BsonDocumentProjectionDefinition_2.htm
BsonDocumentProjectionDefinition(TSource, TProjection) Properties
properties
https://mongodb.github.io/mongo-csharp-driver/2.3/apidocs/html/Methods_T_MongoDB_Driver_BsonDocumentProjectionDefinition_2.htm
BsonDocumentProjectionDefinition(TSource, TProjection) Methods
methods