Performance issue iterating FeatureQueryResult

Question

I have a VB.net application that is using QueryFeaturesAsync to retrieve a FeatureQueryResult  from a shapefile. It typically returns between 2 and 12 features. When I iterate through the result (for each fragment in FeatureQueryResult ) it takes forever - about 7-20 seconds.

What I'm trying to achieve is to calculate the Extent of the FeatureQueryResult . I do this by iterating though the FeatureQueryResult  and doing a CombineExtents for each individual result. Is there a way to do this without iterating? Why is it so slow?

MarcHillman · Answer

Thank you for the suggestion. I am skeptical the performance issue is shapefile related for 2 reasons.

1. Under esriarcgisruntime 10.x there was no performance issue. Problem seems to be since 100.x
2. Querying seems to provide adequate performance. It is iterating the query result that is the issue. Even if the query result is no more than a series of pointers to the shapefile, the .Any property should not take 3 seconds, particularly when the result is empty - there is no shapefile access involved.

SomeGISGuy · Answer

If performance is critical, I wouldn't recommend using shapefiles. Instead I'd suggest you download the .gdb file from that source, open it in Pro and export that dataset to a runtime geodatabase, then use that instead.

https://pro.arcgis.com/en/pro-app/2.7/help/data/geodatabases/manage-mobile-gdb/mobile-geodatabases.htm

MarcHillman · Answer

I suspect the FeatureQueryResult object is seriously broken. Not only is iterating it very slow, but the simple reference to the .Any property of the object takes 3 seconds, even if empty.