Hi Everybody,

I`ve a new question regarding a new Add-In I`m writing. It`s still for ArcGIS Pro 1.4 and SDK version 1.3.0.5861 because it extents another system on that state. Basically it monitors a local GPS device via serial port and shows the data in different ways. Everything works as desired at the moment but I`m experiencing the behaviour that my ArcGIS Pro buttons from time to time grey out /disable for a short moment.

I know this may have something to do that my UI-thread is blocked somehow but I can`t imagine the reason.

Because my Add-In has already some code in it I decided to attach the complete project as attachment. It will not run as stand-alone because it expects another add-in to be present but maybe the full code will be helpful.

Additionally I`ll try to explain what I`m doing in simplified pseudo code here:

protected GpsPanelViewModel()
{
 _gpsReader = new GPSReader();
 _gpsReader.RaiseGpsValuesReceivedEvent += HandleNewGPSValuesReceivedEvent;
}
private async void HandleNewGPSValuesReceivedEvent(object sender, GpsValueReceivedEventArgs e)
{
 var disposable = await QueuedTask.Run(() =>
 {
 // Do something with received GPS-Data
 // Add map point and update view model parameters for UI update
 }
}
public void DoSomethingWhenGPSButtonIsClicked(object obj)
{
 if (_gpsIsActive == false)
 {
 _gpsReader.StartReading();
 }
 else
 {
 _gpsReader.StopReading();
 }
}
public class GPSReader
{
 private Thread _readGpsThread;
 private Thread _parseGpsThread;
 private System.Threading.Timer _timerReader;
 private System.Threading.Timer _timerParser;
 private BlockingCollection<GpsRawData> _gpsDataBuffer; 
}
public void StartReading() 
{
 _readGpsThread = new Thread(StartGpsReaderLoop);
 _parseGpsThread = new Thread(StartGpsParserLoop);
 _readGpsThread.Start();
 _parseGpsThread.Start();
}
 
public void StopReading()
{
 ClosePort();
 _timerReader.Change(Timeout.Infinite, Timeout.Infinite);
 _timerParser.Change(Timeout.Infinite, Timeout.Infinite);
 _readGpsThread.Abort();
 _parseGpsThread.Abort();
}
private void StartGpsReaderLoop()
{
 _timerReader = new System.Threading.Timer((e) =>
 {
 GetData(); // GET data from GPS and store in _gpsDataBuffer
 }, null, 0, 1000);
}
private void StartGpsParserLoop()
{
 _timerParser = new System.Threading.Timer((e) =>
 {
 ParseData(); // Get raw data from _gpsDataBuffer and raise event when finished
 }, null, 0, 500);
}

The main question for me is, where does the probem occur? Is it because I`m running two additional threads in my GPS-Reader?

Any help would be very appreciated.


Best regards

Richard