public async Task StartLongRunningTask(FunctionPassingToNativeBackground obj)
{
_cts = new CancellationTokenSource();
_taskId = UIApplication.SharedApplication.BeginBackgroundTask("LongRunningTask", OnExpiration);
try
{
//INVOKE THE SHARED CODE
var tmp = obj.ClassObject;
Type type = tmp.GetType();
MethodInfo method = type.GetMethod(obj.FunctionName);
await(Task) method.Invoke(tmp, obj.Params.ToArray());
}
catch (OperationCanceledException)
{
}
finally
{
if (_cts.IsCancellationRequested)
{
var message = new CancelledMessage();
Device.BeginInvokeOnMainThread(
() => MessagingCenter.Send(message, "CancelledMessage")
);
}
}
UIApplication.SharedApplication.EndBackgroundTask(_taskId);
}
void WireUpLongRunningTask()
{
MessagingCenter.Subscribe <StartLongRunningTaskMessage, FunctionPassingToNativeBackground>(this, "StartLongRunningTaskMessage", (message, obj) =>
{
var intent = new Intent(this, typeof(LongRunningTask));
FuncInfo = obj;
FunctionPasserToNativeBackground.FunctionName = FuncInfo.FunctionName;
FunctionPasserToNativeBackground.Params = FuncInfo.Params;
FunctionPasserToNativeBackground.ClassObject = FuncInfo.ClassObject;
StartService(intent);
});
}
