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 step through this recipe, you will need Visual Studio 2012. There are no other prerequisites. The source code for this recipe can be found in BookSamples\Chapter7\Recipe2.

How to do it...

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

1. Start Visual Studio 2012. 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 System.Threading;

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

   static void PrintInfo(string typeName)
   {
     Thread.Sleep(TimeSpan.FromMilliseconds(150));
     Console.WriteLine("{0} type was printed on a thread id {1}", typeName, Thread.CurrentThread.ManagedThreadId);
   }
   
   static string...