多个并行与异步调用的await [英] multiple parallel async calls with await

问题描述

据我知道，当运行时遇到下面的语句是包装了函数的其余部分作为一个回调（someCall（）在这个例子中），这是异步调用的方法。在这种情况下anotherCall（）将作为回调被执行以someCall（）：

as far as i know when runtime come across the statement below it wraps the rest of the function as a callback to the method which is invoked asynchronously (someCall() in this example). in this case anotherCall() will be executed as a callback to someCall():

    await someCall();
    await anotherCall();

我不知道是否有可能使运行时像这样进行：在异步调用的方式someCall（）和immidatelly返回到调用线程，然后调用anotherCall（）类似（无需等待someCall完成）。因为我需要这2种方法异步运行，并假设这些电话都只是发射后不管的电话。

I wonder if it is possible to make runtime perform like this: call someCall() in async fashion and return immidatelly to the calling thread, then invoke anotherCall() similarly (without waiting someCall to complete). because i need these 2 methods run asynchronously and suppose these calls are just fire and forget calls.

所以是有可能只使用异步实现这个场景，并等待（不使用旧的开始/结束的机制）？

so is it possible to implement this scenario using just async and await (not using old begin/end mechanism)?

推荐答案

异步/的await包括一些运营商，以帮助并联组成，如 WhenAll 和 WhenAny 。

The async/await includes a few operators to help with parallel composition, such as WhenAll and WhenAny.

var taskA = someCall(); // Note: no await
var taskB = anotherCall(); // Note: no await

// Wait for both tasks to complete.
await Task.WhenAll(taskA, taskB);

// Retrieve the results.
var resultA = taskA.Result;
var resultB = taskB.Result;

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