private static IDisposable RegisterCancellationAction(TaskCompletionSource <bool> tcs,
CancellationToken cancellationToken, int id)
{
if (cancellationToken.CanBeCanceled == false)
{
return(null);
}
return(cancellationToken.Register(() =>
{
Native.Stop(id).Validate("Failed to cancel");
tcs.TrySetCanceled();
}));
}
private static async Task StartAsyncCore(ToneType tone, AudioStreamPolicy streamPolicy,
int durationMilliseconds, CancellationToken cancellationToken)
{
var tcs = new TaskCompletionSource <bool>();
Native.Start(tone, streamPolicy.Handle, durationMilliseconds, out var id).
Validate("Failed to play tone.");
using (RegisterCancellationAction(tcs, cancellationToken, id))
{
await WaitForDuration(tcs, cancellationToken, durationMilliseconds);
await tcs.Task;
}
}
