CSharp - Parallel LINQ AsOrdered

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Introduction

The AsOrdered operator preserves the order of the results to match the order of the source sequence.

Prototypes

The AsOrdered operator has two prototypes. 

public static ParallelQuery<T> AsOrdered<T>(
          this ParallelQuery<T> source
)

The first AsOrdered prototype enforces result ordering on a ParallelQuery<T>.

The result of the operator is also a ParallelQuery<T>, which you can then use as the input sequence for your PLINQ query.

The second AsOrdered prototype operated on the weakly typed ParallelQuery. 

public static ParallelQuery AsOrdered(
          this ParallelQuery source
)

The second prototype operates on a weakly typed ParallelQuery.

This is the kind of ParallelQuery you get from a legacy collection.

You need to use the OfType or Cast operators before you can use the data sequence in a PLINQ query.

Demo

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

class Program//  www .j ava2s  .  c o  m
{
    static void Main(string[] args)
    {
              string[] codeNames = {"Python", "Java", "Javascript", "Bash", "C++", "Oracle"};
        
              IEnumerable<string> results = codeNames
                  .AsParallel()
                  .AsOrdered()
                  .Where(p => p.Contains('o'))
                  .Select(p => p);
        
              foreach (string president in results) {
            Console.WriteLine("Match: {0}", president);
        }
    }
}

Result