Parallelizing a LINQ query

This recipe will describe how to use PLINQ to make a query parallel and how to go back from a parallel query to sequential processing.

Getting ready

To work through this recipe, you will need Visual Studio 2015. There are no other prerequisites. The source code for this recipe can be found at BookSamples\Chapter7\Recipe2.

How to do it...

To use PLINQ in order to make a query parallel and to go back from a parallel query to sequential processing, perform the following steps:

1. Start Visual Studio 2015. Create a new C# console application project.

2. In the Program.cs file, add the following using directives:

   using System;
   using System.Collections.Generic;
   using System.Diagnostics;
   using System.Linq;
   using static System.Console;
   using static System.Threading.Thread;

3. Add the following code snippet below the Main method:

   static void PrintInfo(string typeName)
   {
     Sleep(TimeSpan.FromMilliseconds(150));
     WriteLine($"{typeName} type was printed on a thread " +
             $"id {CurrentThread...