A while ago I passed the 70-483 exam and thought I might share some of my notes, which I think are the most takeaways from the learning material. The exam itself was fair, but as almost every knowledge test it had some very specific questions such as name of the methods on interfaces (e.g. CompareTo vs Compare on IComparable and IComparer respectively).

1. Parallel LINQ queries does not guarantee preserved order, need to add the AsOrdered() characteristic. It might be quicker than sequential linq query, but it’s not deterministic, need to be tested. Example PLINQ queries:

var orderedCities2 = (from city in cities.AsParallel().AsOrdered()
                      where city.Population > 10000
                      select city)
                        .Take(1000);

var plinqQuery = table
            .AsParallel()
            .Where(n => Enumerable.Range(2, (int) Math.Sqrt(n.Item1)).All(i => n.Item1 % i > 0))
            .Take(10)
            .ToList();