如何使用等待在自定义 TaskScheduler 上运行任务? [英] How to run a Task on a custom TaskScheduler using await?

问题描述

我有一些返回 Task 的方法，我可以在这些方法上随意await.我想让这些任务在自定义 TaskScheduler 上执行，而不是默认的.

I have some methods returning Task<T> on which I can await at will. I'd like to have those Tasks executed on a custom TaskScheduler instead of the default one.

var task = GetTaskAsync ();
await task;

我知道我可以创建一个新的 TaskFactory (new CustomScheduler ()) 并从中做一个 StartNew ()，但是 StartNew ()> 采取行动并创建Task，我已经有了Task(由TaskCompletionSource 在幕后返回)

I know I can create a new TaskFactory (new CustomScheduler ()) and do a StartNew () from it, but StartNew () takes an action and create the Task, and I already have the Task (returned behind the scenes by a TaskCompletionSource)

如何为 await 指定我自己的 TaskScheduler ?

How can I specify my own TaskScheduler for await ?

推荐答案

我认为您真正想要的是使用自定义调度程序执行 Task.Run.StartNew 不适用于异步方法；Stephen Toub 有一篇很棒的博客文章，关于 之间的差异Task.Run 和 TaskFactory.StartNew.

I think what you really want is to do a Task.Run, but with a custom scheduler. StartNew doesn't work intuitively with asynchronous methods; Stephen Toub has a great blog post about the differences between Task.Run and TaskFactory.StartNew.

因此，要创建您自己的自定义Run，您可以执行以下操作:

So, to create your own custom Run, you can do something like this:

private static readonly TaskFactory myTaskFactory = new TaskFactory(
    CancellationToken.None, TaskCreationOptions.DenyChildAttach,
    TaskContinuationOptions.None, new MyTaskScheduler());
private static Task RunOnMyScheduler(Func<Task> func)
{
  return myTaskFactory.StartNew(func).Unwrap();
}
private static Task<T> RunOnMyScheduler<T>(Func<Task<T>> func)
{
  return myTaskFactory.StartNew(func).Unwrap();
}
private static Task RunOnMyScheduler(Action func)
{
  return myTaskFactory.StartNew(func);
}
private static Task<T> RunOnMyScheduler<T>(Func<T> func)
{
  return myTaskFactory.StartNew(func);
}

然后您可以在自定义调度程序上执行同步或异步方法.

Then you can execute synchronous or asynchronous methods on your custom scheduler.

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