Creating a custom aggregator for a PLINQ query

This recipe shows you how to create a custom aggregation function for a PLINQ query.

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\Recipe6.

How to do it...

To understand the workings of a custom aggregation function for a PLINQ query, 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.Concurrent;
   using System.Collections.Generic;
   using System.Linq;
   using static System.Console;
   using static System.Threading.Thread;

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

   static ConcurrentDictionary<char, int> AccumulateLettersInformation(
       ConcurrentDictionary<char, int> taskTotal , string item)
   {
     foreach (var c in item)
     {
       if (taskTotal.ContainsKey(c))
    ...