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

        public void TestFindAndModify()
        {
            _collection.RemoveAll();
            _collection.Insert(new BsonDocument { { "_id", 1 }, { "priority", 1 }, { "inprogress", false }, { "name", "abc" } });
            _collection.Insert(new BsonDocument { { "_id", 2 }, { "priority", 2 }, { "inprogress", false }, { "name", "def" } });

            var query = Query.EQ("inprogress", false);
            var sortBy = SortBy.Descending("priority");
            var started = DateTime.UtcNow;
            started = started.AddTicks(-(started.Ticks % 10000)); // adjust for MongoDB DateTime precision
            var update = Update.Set("inprogress", true).Set("started", started);
            var result = _collection.FindAndModify(query, sortBy, update, false); // return old
            Assert.IsTrue(result.Ok);
            Assert.AreEqual(2, result.ModifiedDocument["_id"].AsInt32);
            Assert.AreEqual(2, result.ModifiedDocument["priority"].AsInt32);
            Assert.AreEqual(false, result.ModifiedDocument["inprogress"].AsBoolean);
            Assert.AreEqual("def", result.ModifiedDocument["name"].AsString);
            Assert.IsFalse(result.ModifiedDocument.Contains("started"));

            started = DateTime.UtcNow;
            started = started.AddTicks(-(started.Ticks % 10000)); // adjust for MongoDB DateTime precision
            update = Update.Set("inprogress", true).Set("started", started);
            result = _collection.FindAndModify(query, sortBy, update, true); // return new
            Assert.IsTrue(result.Ok);
            Assert.AreEqual(1, result.ModifiedDocument["_id"].AsInt32);
            Assert.AreEqual(1, result.ModifiedDocument["priority"].AsInt32);
            Assert.AreEqual(true, result.ModifiedDocument["inprogress"].AsBoolean);
            Assert.AreEqual("abc", result.ModifiedDocument["name"].AsString);
            Assert.AreEqual(started, result.ModifiedDocument["started"].ToUniversalTime());
        }