PLINQ /Parallel LINQ is part of the TPL (Task Parallel Library) and it makes your life easier when it comes to multi-core processor programming which is totally different from multithreading which allows more than one thread per process and you have no idea if they will be equally distributed across CPU cores. To use PLINQ your objects have to be in memory. This means you can’t use AsParallel on LINQ to SQL until you bring all your query results over to the local machine. When it comes to running your code in parallel the key to remember is that the AsParallel method is you friend. Every result that gets returned after your first call to AsParallel is always a ParallelQuery object. You can get more theory here. Now go code!
static void Main(string args)
Action<int> action = (int itemFromList) => Console.Write(itemFromList + ",");
var lst = Enumerable.Range(1, 10);
//This will use the maximum number of processors on your machine up to 64
lst.AsParallel().Select(i => i * i).ForAll(action);
//My machine has 4 cores but i only need it to use up to 2 cores so I use the WithDegreeOfParallelism to restrict it
Cropped diagram courtesy of MSDN PFX (Parallel Programming Framework)
This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)
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