我如何".Wait()"?在ConfiguredTaskAwaitable上? [英] How do I ".Wait( )" on a ConfiguredTaskAwaitable?

问题描述

给出以下扩展名以防止Tasks阻止UI线程(可能不是确切的正确术语，而是其他):

Given the following extension to prevent Tasks from blocking the UI Thread ( probably not the exact correct terminology but whatever ) :

    public static ConfiguredTaskAwaitable DontBlock( this Task T ) {
        return T.ConfigureAwait( false );
    }

    public static ConfiguredTaskAwaitable<T> DontBlock<T>( this Task<T> T2 ) {
        return T2.ConfigureAwait( false );
    }

在某些情况下(例如，如果我需要在对象构造函数中调用awaitable，或者需要从WinForms Program.Main( )方法中调用.Wait( ))，则需要执行以下操作:

In some cases ( such as if I need to call an awaitable within an object constructor, or if I need to call .Wait( ) from a WinForms Program.Main( ) method), I need to do the following :

public class Foo{
    public Foo( ){
        //I know full well that the result from DontBlock does not have a 'wait' method, so of course this will fail miserably.
        AwaitableBar.DontBlock( ).Wait( );
    }
}

如果我不能在async函数/方法上调用它，该如何在async函数/方法之外等待"它?我看到它有一个.GetAwaiter( )方法，该方法返回一个ConfiguredTaskAwaiter对象，但是我不知道该怎么做，而Google又使我失败了...我应该在返回的对象上调用GetResult( )吗?马上?这样做会等待一切完成，还是跳过它，或者爆炸?

How can I 'await' it outside an async function/method if I can't call .Wait( ) on it? I see that it has a .GetAwaiter( ) method which returns a ConfiguredTaskAwaiter object, but I have no idea what to do with it, and Google has failed me again... Am I supposed to call GetResult( ) on the returned object right away? Will doing that wait for everything to finish, or just skip right over it, or explode?

推荐答案

我同意@usr的观点，认为返回ConfiguredTaskAwaitable并不理想.通常，您的异步方法应返回任务.这是关注点分离的问题.

I agree with the @usr that returning a ConfiguredTaskAwaitable is not ideal. Generally, your asynchronous methods should return tasks. This is a matter of separation of concerns.

但是，一旦有了ConfiguredTaskAwaitable，只需调用awaitableObj.GetAwaiter().GetResult()(或适当的替换项)即可. GetResult()将阻止.

Once you have a ConfiguredTaskAwaitable, though, simply call awaitableObj.GetAwaiter().GetResult() (or the appropriate substitution). GetResult() will block.

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