Getting a single object from mongodb in C#

Question

I've picked up a piece of code that is using the MongoDB driver like this to get a single object from a collection...this can't be right, can it? Is there a better way of getting this?

IMongoCollection<ApplicationUser> userCollection;
....
userCollection.FindAsync(x => x.Id == inputId).Result.ToListAsync().Result.Single();

Answer 1

Yes, there is.

First of all don't use FindAsync, use Find instead. On the IFindFluent result use the SingleAsync extension method and await the returned task inside an async method:

async Task MainAsync()
{
    IMongoCollection<ApplicationUser> userCollection = ...;

    var applicationUser = await userCollection.Find(_ => _.Id == inputId).SingleAsync();
}

The new driver uses async-await exclusively. Don't block on it by using Task.Result.