Graphic TimeExtent null

Question

Hi!
I'm attempting to query a time enabled layer and then set the map.TimeExtent property based on the time extent of the returned graphic. The query is executed correctly but the Graphic.TimeExtent property is always null.

I've confirmed through the REST services directory page that the layer is time enabled and it interacts correctly with the time slider object.

I'm returning all of the fields and the shape.

Maybe this property isn't what I think it is? Maybe I'm missing some property on my query object? Is there another way to get at a feature's time property?

Thanks!!
Jill

JillianStanford · Answer

Morten and Jennifer,
Thank you for you replies.

I was hopeful when you said that a feature layer was "essentially GraphicsLayer + QueryTask". 🙂

Yes, I can grab the info from the attributes but the nice thing about the time enabled layer is that I don't have to keep track of the time fields in the app, at least when I'm using the time slider.

Thanks again!
Jill

SomeGISGuy · Answer

When your QueryTask comes back, you can set the TimeExtent yourself based on whatever attributes you want to define the time extent.
Ie.foreach(var graphic in queryTaskResult)
     graphic.TimeExtent = new TimeExtent((DateTime)graphic.Attributes["StartTime"],(DateTime)graphic.Attributes["EndTime"]);

JenniferNery · Answer

Thanks for sharing your code. QueryTask results is expected to have null TimeExtent on the feature. Unlike the FeatureLayer, a QueryTask does not know of the service Time Info. QueryTask only knows about the attribute value for time.