Hands-On Parallel Programming with C# 8 and .NET Core 3

Using the Parallel.Invoke method

This is the most basic way of executing a set of operations in parallel and forms the basis for parallel for and foreach loops. The Parallel.Invoke method accepts an array of actions as a parameter and executes them, though it never guarantees that the actions will be executed in parallel. There are some important points to remember when using Parallel.Invoke:

• Parallelism is not guaranteed. Whether the actions are executed in parallel or in sequence will depend on the TaskScheduler.
• Parallel.Invoke doesn't guarantee the order of operations for passed actions.
• It blocks the calling thread until all the actions are completed.

The syntax of Parallel.Invoke is as follows:

public static void Invoke( params Action[] ...