DistinctAsync against array sub documents with MongoDB C# 2.0 driver -

in mongodb 3.0 c# 2.0 driver, how distinct list of values using distinctasync document's array of sub documents?

i'm looking c# equivalent of in shell:

db.cars.distinct("parts.name", {"make":"ford"}) 

after admitting defeat, resorted shell-ish code:

var distinctparts = await db.runcommandasync<bsondocument>(new bsondocument {     { "distinct", "cars"},      {"key", "parts.name"},     {"query", new bsondocument { { "make", "ford" }} } }); 

thanks!

something should work:

var filter = new  mongodb.driver.expressionfilterdefinition<cars_type>(x => x.make == "ford"); var distinctparts = await cars_collection.distinctasync<string>("parts.name", filter);