topic QueuedTask.Run(...).Wait() hangs and await QueuedTask.Run(...) makes QueuedTask busy for too long in ArcGIS Pro SDK Questions

QueuedTask.Run(...).Wait() hangs and await QueuedTask.Run(...) makes QueuedTask busy for too long

Shahadat_1200 — Wed, 31 Jan 2024 11:10:52 GMT

QueuedTask.Run(..) hangs when I use Wait() method

public void SetFeatureLayerSymbolAsync(ArcGIS.Desktop.Mapping.FeatureLayer ftrLayer, CIMSymbol symbolToApply) { if (ftrLayer == null || symbolToApply == null) throw new System.ArgumentNullException(); CIMSimpleRenderer currentRenderer = QueuedTask.Run(()=> ftrLayer.GetRenderer() as CIMSimpleRenderer).Result; if (currentRenderer == null) return; symbolToApply.SetRealWorldUnits(ftrLayer.UsesRealWorldSymbolSizes); currentRenderer.Symbol = symbolToApply.MakeSymbolReference(); QueuedTask.Run(()=> ftrLayer.SetRenderer(currentRenderer)).Wait(); }

And If I use await, it doesn't go to the next line(line 18), returns to the caller method(line 3) and QueuedTask still remains busy(line 4)

public void SetCustomPictureSymbol(ArcGIS.Desktop.Mapping.FeatureLayer featureLayer) { SetFeatureLayerSymbolAsync(featureLayer, _symbol.Symbol); if (QueuedTask.Busy) Task.Delay(1000); } public async Task SetFeatureLayerSymbolAsync(ArcGIS.Desktop.Mapping.FeatureLayer ftrLayer, CIMSymbol symbolToApply) { if (ftrLayer == null || symbolToApply == null) throw new System.ArgumentNullException(); CIMSimpleRenderer currentRenderer = QueuedTask.Run(()=> ftrLayer.GetRenderer() as CIMSimpleRenderer).Result; if (currentRenderer == null) return; symbolToApply.SetRealWorldUnits(ftrLayer.UsesRealWorldSymbolSizes); currentRenderer.Symbol = symbolToApply.MakeSymbolReference(); await QueuedTask.Run(()=> ftrLayer.SetRenderer(currentRenderer)); if (QueuedTask.Busy) { Task.Delay(1000); } }

Re: QueuedTask.Run(...).Wait() hangs and await QueuedTask.Run(...) makes QueuedTask busy for too long

KenBuja — Wed, 31 Jan 2024 14:21:00 GMT

Why are you applying the Wait method? Your code is almost the same as in the documentation, but it wraps everything in the QueuedTask and doesn't include the Wait method.

public Task SetFeatureLayerSymbolAsync(FeatureLayer ftrLayer, CIMSymbol symbolToApply) { if (ftrLayer == null || symbolToApply == null) throw new System.ArgumentNullException(); return QueuedTask.Run(() => { //Get simple renderer from the feature layer CIMSimpleRenderer currentRenderer = ftrLayer.GetRenderer() as CIMSimpleRenderer; if (currentRenderer == null) return; //Set symbol's real world setting to be the same as that of the feature layer symbolToApply.SetRealWorldUnits(ftrLayer.UsesRealWorldSymbolSizes); //Update the symbol of the current simple renderer currentRenderer.Symbol = symbolToApply.MakeSymbolReference(); //Update the feature layer renderer ftrLayer.SetRenderer(currentRenderer); }); }

Re: QueuedTask.Run(...).Wait() hangs and await QueuedTask.Run(...) makes QueuedTask busy for too long

Shahadat_1200 — Mon, 05 Feb 2024 09:25:00 GMT

Thank you for your Reply @KenBuja !

We want to do it for multiple layers. For single layer it works this way but for multiple it doesn't. For the second layer it gets QueuedTask busy when we try to Run it. To fix this we were trying Wait, await and other ways.

It fails in all cases.

Re: QueuedTask.Run(...).Wait() hangs and await QueuedTask.Run(...) makes QueuedTask busy for too long

tempStephenRhea_NV5 — Thu, 25 Apr 2024 16:43:29 GMT

Instead of using smaller QueuedTask calls everywhere, I've found that it's better to wrap the calls in a QueuedTask so everything executes in the same task. That would also allow you to remove the Async from SetFeatureLayerSymbol Something like:

public async Task ApplySymbologyAsync() { IEnumerable<FeatureLayer> featureLayers = ActiveMap.GetLayersAsFlattenedList().OfType<FeatureLayer>(); await QueuedTask.Run(() => { foreach (FeatureLayer featureLayer in featureLayers) { SetFeatureLayerSymbol(featureLayer, {howeverYouObtainYourSymbol}); } }); } public void SetFeatureLayerSymbolAsync(ArcGIS.Desktop.Mapping.FeatureLayer ftrLayer, CIMSymbol symbolToApply) { if (ftrLayer == null || symbolToApply == null) throw new System.ArgumentNullException(); CIMSimpleRenderer currentRenderer = ftrLayer.GetRenderer() as CIMSimpleRenderer; if (currentRenderer == null) return; symbolToApply.SetRealWorldUnits(ftrLayer.UsesRealWorldSymbolSizes); currentRenderer.Symbol = symbolToApply.MakeSymbolReference(); ftrLayer.SetRenderer(currentRenderer); }