Task vs. Thread in .NET: When Should I Use Which?

.NET concurrent: the choice of task and thread

.NET framework provided two types for complication: TASK and Thread. Although both can be used for asynchronous execution code, there are fundamental differences between them, which will affect their applicability of specific scenes.

The difference between task and thread

Thread It represents a concept of heavyweight, low -level, which runs at the operating system level. When creating a thread, you clearly specify that the code will be executed on a separate execution thread. The thread has its own stack memory and can access shared resources independently, which may lead to competitive conditions and other concurrent problems.

In contrast, Task is a higher -level concept, which means that asynchronous operations and future results promises. TASK is lightweight. It is managed by a thread pool. The thread pool optimizes resources and reduces the overhead related to thread creation. Unlike threads, TASK does not have a dedicated stack, and shared resources in other TASK in the same thread in the thread pool.

When to use thread instead of task (vice versa)

In the following cases, use Thread:

It is necessary to explicitly control the creation and execution of threads.

It requires long -term operation, which will take up special threads for a long time.

You need to manage threads local storage or communicate directly with the operating system.

In the following circumstances, use TASK:
is more inclined to use higher levels of abstraction, and hope that thread pool management resources are allocated.

There is an asynchronous operation that does not require exclusive thread access, such as web service calls or database query. Want to use the Async/Await mode for asynchronous programming.

• Summary
The difference between understanding the difference between Task and Thread is essential for choosing a suitable concurrency mechanism for the .NET code. As much as possible to use higher levels of TASK abstraction, it can simplify concurrency management, reduce overhead and increase the maintenance of code. However, the Thread class provides necessary flexibility for the scene of explicit thread control or dedicated thread -related functions.

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