C# 任务何时真正开始? [英] When does a C# Task actually start?

问题描述

任务实际何时开始?

public void DoSomething() {
    Task myTask = DoSomethingAsync();

    Task.WaitAll(new[] { myTask }, 2000);
}

public async Task DoSomethingAsync() {
    await SomethingElse();
}

在 Task myTask = DoSomethingAsync(); 中初始化时是否立即启动，或者在 Task.WaitAll(new[] { myTask } 中说要等待它时启动, 2000); ?

Does it start immediately when initializing it in Task myTask = DoSomethingAsync(); or does it start when you say to wait for it in Task.WaitAll(new[] { myTask }, 2000); ?

推荐答案

调用 async 方法返回一个 hot 任务，一个已经启动的任务.所以没有必要强制它运行的实际代码.

Calling an async method returns a hot task, a task that has already been started. So there is no actual code necessary to force it to run.

根据 MSDN(感谢 Stephen Cleary) 基于任务的异步模式 (TAP) 模式 要求返回的任务很热.这意味着所有任务，除了那些用 new Task 创建的任务都将是热的.

According MSDN (thanks to Stephen Cleary) the Task-based Asynchronous Pattern (TAP) pattern requires returned tasks to be hot. That means that all tasks, except those created with new Task will be hot.

来自参考文章:

由公共 Task 构造函数创建的任务被称为冷任务......所有其他任务在热状态下开始它们的生命周期.

Tasks that are created by the public Task constructors are referred to as cold tasks... All other tasks begin their life cycle in a hot state.

这篇关于C# 任务何时真正开始?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！