Microsoft Certified Solutions Developer (MCSD) Certification Practice Test

How do you execute a PLINQ query?

1. Use AsParallel()

2. Use PLINQ.Execute()

3. Use Parallel.ForEach()

4. Use Parallel.Invoke()

The correct answer is: Use AsParallel()

To execute a PLINQ (Parallel Language Integrated Query) query, the method to use is AsParallel(). This method is essential in enabling parallel processing of data queries. When you apply AsParallel() to a LINQ query, it modifies the execution of the query so that it can be processed in parallel across multiple threads. This significantly improves performance, particularly with large datasets, by leveraging multiple processors or cores within the machine. The functionality provided by AsParallel() allows the underlying data processing framework to automatically distribute the workload, improving execution time through concurrency. It is designed specifically for working with LINQ queries in a parallelized manner, making it the foundational step in utilizing PLINQ. In contrast, the other options involve different mechanisms for parallel execution but do not directly relate to executing PLINQ queries. For example, PLINQ.Execute() is not a valid method within the PLINQ framework, and both Parallel.ForEach() and Parallel.Invoke() serve different purposes within the Task Parallel Library (TPL)—mainly for executing tasks and iterations in parallel but not specifically for executing LINQ queries. Thus, AsParallel() is the correct method for executing PLINQ queries effectively.