Task.Start(), Task.Run(), and Task.Factory.StartNew(): When Should You Use Each?

In-depth understanding of Task.Start(), Task.Run() and Task.Factory.StartNew()

The Task Parallel Library (TPL) provides multiple ways to create and schedule asynchronous operations. This article aims to clarify the usage scenarios and differences of Task.Start(), Task.Run() and Task.Factory.StartNew().

Comparison of Task.Start(), Task.Run() and Task.Factory.StartNew()

While all three methods can create and start asynchronous tasks, they have different functions and uses.

Task.Start()

Task.Start() is a low-level method that requires manual creation and scheduling of tasks. It has limited control over task execution and is generally not recommended for most scenarios.

Task.Run()

Task.Run() provides a shortcut to Task.Factory.StartNew() with specific and safe parameters. It creates a new task on the default scheduler, with options such as denying child attachments and using default cancel flags.

Task.Factory.StartNew()

Task.Factory.StartNew() is the most flexible and powerful method. It allows custom task creation and scheduling options including:

• TaskCreationOptions (e.g. DenyChildAttach, LongRunning)
• Unmark
• Scheduler (e.g., ThreadPool, Thread.CurrentThread)

When to use each method

• Task.Run(): Ideal for simple scenarios where you need to offload work to the thread pool or perform cheap operations.
• Task.Factory.StartNew(): Recommended for more complex scenarios that require specific execution or cancellation behavior. It provides fine-grained control over task properties.
• Task.Start(): Use only if you have a specific reason to separate task creation and scheduling. This situation is rare.

Summary

For most practical purposes, Task.Run() is the primary choice for asynchronous operations. If you need more customization, Task.Factory.StartNew() provides the necessary flexibility. However, avoid using Task.Start() unless you have a good reason.

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