topic Re: Refresh Dynamic Layer using timer in ArcGIS API for Silverlight Questions

Refresh Dynamic Layer using timer

PieterCoetzer — Tue, 25 May 2010 11:59:52 GMT

Hi Guys,

I'm trying to refresh a map view loaded in a WPF application, based on a timer.

I have tried to refresh the Dynamic Layers using the Layer.Refresh() on the timer's interval, but it does not refresh the map view. Only when a pan or zoom event is done on the map viewer, then the view refreshes.

My code:

Window Load:

DispatcherTimer localTimer = new DispatcherTimer();
localTimer.Tick += new EventHandler(localTimer_Tick);
localTimer.Interval = new TimeSpan(0, 0, 30);

Method to refresh the layers:

private void localTimer_Tick(object sender, EventArgs e)
{
     foreach (Layer layer in MyMap.Layers)
     if ((layer is DynamicLayer) && (layer.Visible == true))
     {
         (layer as DynamicLayer).Refresh();
     }
}

Any suggestions??

Re: Refresh Dynamic Layer using timer

dotMorten_esri — Tue, 25 May 2010 14:58:41 GMT

Did you set DisableClientCache=False on the layer?

Re: Refresh Dynamic Layer using timer

PieterCoetzer — Wed, 26 May 2010 06:22:26 GMT

Hi Morten,

I actually left it default, but with you highlighting this, I changed the property to true and whala, it refreshes.

Thanks for the guidance.

In the layer load method:

NewDynLayer.DisableClientCaching = true;

Re: Refresh Dynamic Layer using timer

dotMorten_esri — Wed, 26 May 2010 15:16:18 GMT

Default settings are usually set for maximum performance. This means that for certain scenarios (like this) you might have to tweak the defaults.

Re: Refresh Dynamic Layer using timer

BrandonLand — Thu, 31 Mar 2011 14:25:37 GMT

This was VERY helpful to me guys, thank you.