Custom async Method

Question

Is there a way to make an asynchronous call to a custom method in WP7 - WP8?

In a Windows Forms app i would simply do this:

private void btnStart_Click(object sender, EventArgs e)
{
    MyMethod();
}

private async void MyMethod()
{
    await System.Threading.Tasks.Task.Run(() => Thread.Sleep(5000));
}

However, it seems like the System.Threading.Tasks namespace is not supported in WP apps.

Then what should i do if i wished to act similarly in my WP7 - WP8 app?

Stephen Cleary · Accepted Answer · 2013-06-29 13:24:23Z

3

You can install Microsoft.Bcl.Async for WP7.5 support. If you need WP7.0 support, your best bet is BackgroundWorker.

P.S. Your WinForms example would be better written as:

private async void btnStart_Click(object sender, EventArgs e)
{
    await Task.Run(() => MyMethod());
}

private void MyMethod()
{
    Thread.Sleep(5000);
}

Following these best practices:

Avoid async void.
Don't use Task.Run in general-purpose library methods.

answered Jun 29, 2013 at 13:24

Stephen Cleary

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2 Comments

anfri Over a year ago

Thanks for that, but i still have an issue. I wrote an asynchronous event handler for the TextBox.TextChanged event, but i get an error that states "invalid cross-thread call" when i try to do this: await TaskEx.Run(() => MyMethod()); OR await Task.Factory.StartNew(() => MyMethod()); How could i solve this?

Stephen Cleary Over a year ago

Any UI updates need to be done on the UI thread, so they can't be within a call to Task.Run. You'll need to split up MyMethod into the "background" parts and the "UI" parts.

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