Timer doesn't contain in System.Threading at Xamarin.Forms

Question

I used System.Threading.Timer in Xamarin.Android.

How I can use the same class in Xamarin.Forms? (I want to transfer my projec

Answer 1

For PCL you can create your own using async/await features. Another advantage of this approach - your timer method implementation can await on async methods inside timer handler

public sealed class AsyncTimer : CancellationTokenSource
{
    public AsyncTimer (Func callback, int millisecondsDueTime, int millisecondsPeriod)
    {
        Task.Run(async () =>
        {
            await Task.Delay(millisecondsDueTime, Token);
            while (!IsCancellationRequested)
            {
                await callback();
                if (!IsCancellationRequested)
                    await Task.Delay(millisecondsPeriod, Token).ConfigureAwait(false);
            }
        });
    }

    protected override void Dispose(bool disposing)
    {
        if (disposing)
            Cancel();

        base.Dispose(disposing);
    }
}

Usage:

{
  ...
  var timer = new AsyncTimer(OnTimer, 0, 1000);
}

private async Task OnTimer()
{
   // Do something
   await MyMethodAsync();
}