Microsoft Certified Solutions Developer (MCSD) Certification Practice Test

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Which method allows you to return an ordered list from a PLINQ query?

AsOrdered()
OrderBy()
SortBy()
ReturnOrdered()

The correct answer is: AsOrdered()

The method that allows you to return an ordered list from a PLINQ (Parallel LINQ) query is AsOrdered(). This method is specifically designed to ensure that the results are returned in the original order of the elements as they appear in the source collection. When PLINQ processes data in parallel, the default behavior may lead to an unordered output because of the concurrent execution of queries. By using AsOrdered(), you instruct PLINQ to maintain the order of the original sequence. OrderBy() is used for sorting the elements based on a specified key and will reorder the entire data set according to the key provided, but it does not ensure the order of elements as they appear in the source collection when used alone in the context of PLINQ. SortBy() and ReturnOrdered() are not valid methods in the context of PLINQ. Overall, AsOrdered() is key for preserving order in parallelized queries.