[英]Await inside System.Threading.Timer callback
I am doing an ASP.NET Web API and have a BackgroundService
like this:我正在做一个 ASP.NET Web API 并且有这样的BackgroundService
:
Inside Doing
, I to await a task 1:在Doing
中,我等待任务 1:
The problem is with the TimeSpan.FromSeconds(0.5))
the ExecuteAsync
will do create a new Doing()
without waiting for my task to be done.问题在于TimeSpan.FromSeconds(0.5))
ExecuteAsync
会创建一个新的Doing()
而无需等待我的任务完成。
The console result:控制台结果:
How can I resolve this?我该如何解决这个问题? Or is there a way to achieve a background task with await for the task completion?或者有没有办法通过等待任务完成来实现后台任务?
Don't use a Timer
.不要使用Timer
。 Instead set up a loop
and use Task.Delay
for the wait period.而是设置一个loop
并在等待期间使用Task.Delay
。
protected override async Task ExecuteAsync(CancellationToken cancellationToken)
{
var delay = TimeSpan.FromSeconds(0.5);
while (!cancellationToken.IsCancellationRequested)
{
await Doing();
await Task.Delay(delay, cancellationToken);
}
}
See an example in Microsofts documentation .请参阅Microsoft 文档中的示例。
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