Task.Run() vs. Task.Factory.StartNew(): When Should You Use Which?

.NET asynchronous programming: Comparison of Task.Run() and Task.Factory.StartNew()

In .NET asynchronous programming, it is often necessary to create and start new tasks. For this purpose, the .NET framework provides two commonly used methods: Task.Run() and Task.Factory.StartNew(). While both achieve the same basic goal, their functionality and use cases differ.

Task.Factory.StartNew()

Task.Factory.StartNew()More feature-rich, providing multiple options to customize the behavior of new tasks. Some of the key parameters it accepts include:

• Action/Func: Delegate to be executed in a new task.
• CancellationToken: A cancellation token that can be used to abort the task.
• TaskCreationOptions: A set of options that control the behavior of a task, such as its creation options and scheduler.
• TaskScheduler: The scheduler that will execute the task.

This flexibility allows you to tailor tasks to your specific needs, such as creating long-running tasks or executing tasks on specific threads.

Task.Run()

Task.Run() is a simplified version of Task.Factory.StartNew() introduced in .NET 4.5. It provides a default configuration for new tasks, using the following settings:

• CancellationToken.None: Does not use cancellation token.
• TaskCreationOptions.DenyChildAttach: Subtasks created by new tasks cannot be attached to the original task.
• TaskScheduler.Default: The task will run on the default task scheduler, usually using a thread pool.

is a convenient choice when you don't need any special customization and just use the default settings to quickly start a new task. Task.Run()

When to use Task.Run() vs. Task.Factory.StartNew()

In general, use

when you need to customize the behavior of a new task. This includes the following scenarios: Task.Factory.StartNew()

Create long-running tasks
Specify a specific cancellation policy
Execute tasks on a specific thread or thread pool

Use

when you don’t need any customization and just create a new task with default settings. Task.Run() is a shortcut that simplifies task creation without additional configuration. Task.Run()

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