MongoDB.DriverUnitTests.MongoCollectionTests.TestSetFields C# (CSharp) Метод

        public void TestSetFields()
        {
            _collection.RemoveAll();
            _collection.Insert(new BsonDocument { { "x", 1 }, { "y", 2 } });
            var result = _collection.FindAll().SetFields("x").FirstOrDefault();
            Assert.AreEqual(2, result.ElementCount);
            Assert.AreEqual("_id", result.GetElement(0).Name);
            Assert.AreEqual("x", result.GetElement(1).Name);
        }