CODEWITHSUNDEEP
c#asynchronousasync-await
HPPPY
HPPPY

Reputation: 39

await still blocks current UI thread

I tried to use the following code to run some task in thread pool:

private async void button1_Click(object sender, EventArgs e)
{
   await test().ConfigureAwait(continueOnCapturedContext: false);
}
private Task test()
{
   Thread.Sleep(100000);
   return null;
}

The code is supposed to run in the threadpool, however the current UI thread is still being blocked.

So can anyone help to take a look? thanks,

Upvotes: 3

Views: 3139

Answers (2)

Fabien ESCOFFIER
Fabien ESCOFFIER

Reputation: 4911

You should use Task.Delay method.

private async void button1_Click(object sender, EventArgs e)
{
   await test();
}

private Task test()
{
    return Task.Delay(100000);
}

Edit :

Related question / answer.

Upvotes: 2

Stephen Cleary
Stephen Cleary

Reputation: 457197

The code is supposed to run in the threadpool

No, that is not at all true. async does not run your code on a thread pool thread.

I suggest you read my async intro, which explains what async does do, and the official async FAQ, which addresses the thread pool misconception specifically:

Does the “async” keyword cause the invocation of a method to queue to the ThreadPool? To create a new thread? To launch a rocket ship to Mars?

No. No. And no.

Upvotes: 5

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