异步 Task.WhenAll 超时 [英] Asynchronous Task.WhenAll with timeout

问题描述

在新的异步 dotnet 4.5 库中有没有办法在 Task.WhenAll 方法?我想获取多个源，并在 5 秒后停止，并跳过未完成的源.

Is there a way in the new async dotnet 4.5 library to set a timeout on the Task.WhenAll method? I want to fetch several sources, and stop after say 5 seconds, and skip the sources that weren't finished.

推荐答案

您可以使用 Task 将生成的 Task 与 Task.Delay() 结合起来.WhenAny():

You could combine the resulting Task with a Task.Delay() using Task.WhenAny():

await Task.WhenAny(Task.WhenAll(tasks), Task.Delay(timeout));

如果你想在超时的情况下收获已完成的任务:

If you want to harvest completed tasks in case of a timeout:

var completedResults =
  tasks
  .Where(t => t.Status == TaskStatus.RanToCompletion)
  .Select(t => t.Result)
  .ToList();

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