There are no async method in Linq Query Syntax when you want to retrieve an object.

For example:

var peter = await (from x in collection.AsQueryable()
where x.Name == "Peter"
select x).FirstOrDefaultAsync();

This will create an error. FirstOrDefaultAsync() does not exist. However, FirstOrDefault() does exit.

But the async method exists in Linq Method Syntax.

I also wrote it in Stackoverflow here: https://stackoverflow.com/questions/47169729/is-mongodb-c-sharp-driver-linq-query-syntax-missing-async-method?noredirect=1#comment81290069_47169729

It would be so awesome if we could get this feature