问题描述
我们知道，C#7 允许使 Main() 函数异步.
As we know, C#7 allows to make Main() function asynchronous.
它有什么优势?您可以出于什么目的使用 async Main 而不是普通的 Main?
What advantages it gives? For what purpose may you use async Main instead of a normal one?
推荐答案
实际上是 C# 7.1 引入了 async main.
It's actually C# 7.1 that introduces async main.
它的目的是用于您 Main 方法直接调用一个或多个异步方法的情况.在 C# 7.1 之前，您必须为该主要方法引入一定程度的仪式，例如必须通过 SomeAsyncMethod().GetAwaiter().GetResult() 调用这些异步方法.
The purpose of it is for situations where you Main method calls one or more async methods directly. Prior to C# 7.1, you had to introduce a degree of ceremony to that main method, such as having to invoke those async methods via SomeAsyncMethod().GetAwaiter().GetResult().
通过将 Main 标记为 async 可以简化该仪式，例如:
By being able to mark Main as async simplifies that ceremony, eg:
static void Main(string[] args) => MainAsync(args).GetAwaiter().GetResult();
static async Task MainAsync(string[] args)
{
await ...
}
变成:
static async Task Main(string[] args)
{
await ...
}
有关使用此功能的详细介绍，请参阅 C# 7 系列，第 2 部分:异步主.
For a good write-up on using this feature, see C# 7 Series, Part 2: Async Main.
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