Question

我对async和await的概念相当陌生。现在我有这样的事情：

public async void DoSomething()
{
    using (var obj = new SomeClass())
    {
        await obj.SomeAction();
    }

    Done = true;
}

但是随着obj对象的创建和管理变得越来越复杂，我想将其重构为：

public async void DoSomething()
{
    Manager.Execute(obj =>
    {
        await obj.SomeAction();
    });

    Done = true;
}

但上面的代码不会编译。它肯定在这里或那里缺少一些async或await个关键字。我也不知道如何编写Execute()方法。你能帮忙吗？

Answer 1

首先，要在lambdas中使用await，您必须使用async修饰符来装饰它们，就像方法一样：

Func<Task<Foo>> asyncFooFactory = async () => await whatever;

然后Execute方法如下所示：

// instead of Task, you could use void, but then you can't await its completion,
// which could get handy later, depending on your use case
public static async Task Execute(Func<YourClass, Task> externalStuff)
{
    using (var obj = new YourClass()) // replace with your own initializer code
    {
        await externalStuff(obj);
    }
}

将部分异步方法重构为lambda

1 个答案: