依次执行多个异步方法调用 [英] Perform Multiple Async Method Calls Sequentially

问题描述

似乎我过去曾遇到过这个问题的答案，但现在找不到了.

It seems like I have come across the answer to this question in the past but now I cannot locate it.

假设我有两个异步方法，Method1和Method2.如果我需要先调用Method1然后依次调用Method2(读取，Method1必须在Method2之前完成)，那么下面的代码正确吗?

Suppose I have two asynchronous methods, Method1 and Method2. If I need to call Method1 and then Method2 sequentially (read, Method1 must complete before Method2), is the following code correct?

await Method1();
await Method2();

根据来自另一个SO问题的已接受答案的信息此处，并且MSDN文章此处中的信息，我相信这是正确的方法做吧.另外，此代码似乎可以正常工作，但我不想引入一个细微的错误，以后很难找到.

Based on information from the accepted answer to another SO question here and information in the MSDN article here, I believe this is the correct way to do it. Also, this code appears to work but I don't want to introduce a subtle bug that will be much harder to track down later.

推荐答案

是的，这是正确的方法.它们将按顺序执行.

Yes, this is the correct way. They will execute sequentially.

msdn中的重要报价:

The important quote from the msdn:

await运算符告诉编译器，异步方法不能继续到该点为止，直到等待的异步过程完成为止.

The await operator tells the compiler that the async method can't continue past that point until the awaited asynchronous process is complete.

如果您想并行执行它们，则必须使用如下代码:

If you wanted to execute them in parallel, you'd have to use something like this:

var t1 = DoTaskAsync(...);
var t2 = DoTaskAsync(...);
var t3 = DoTaskAsync(...);

await Task.WhenAll(t1, t2, t3);

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