topic Re: Layer not initialized in ArcGIS API for Silverlight Questions

Layer not initialized

LuisGarcia2 — Wed, 06 Jun 2012 16:51:43 GMT

I am uploading some layers dynamically and this is the code I am using for that:

ArcGISDynamicMapServiceLayer layer = new ArcGISDynamicMapServiceLayer();                      layer.Url = myUrl; //this is just a string I acquire somewhere else  layer.InitializationFailed += new EventHandler<EventArgs>(layer_InitializationFailed); //I added this in case our service was down  layer.Initialize(); //I initialized here and...  if (layer.IsInitialized) //when I test in this line it says false       map1.Layers.Insert(1, layer);  ......  void layer_InitializationFailed(object sender, EventArgs e) {             MessageBox.Show("Your Layer was not initialized properly. The service may be down or there is a network problem."); }

As you notice in the code, I initialize the layer and then test to make sure it has been initialized otherwise I do not add the layer. I did this since our internal service is sometimes down for maintenance. That way we avoid crashes or errors in the application. The interesting thing is that this code was working fine before. Now it does not add the layer to the map because it is always returning false and there is no error being handle either, no message box comes up ever.
Any ideas??
Thanks

Re: Layer not initialized

JenniferNery — Wed, 06 Jun 2012 20:27:23 GMT

Initialize is an asynchronous operation, which means you have to do the code in your Initialized event handler.

   ArcGISDynamicMapServiceLayer layer = new ArcGISDynamicMapServiceLayer() { Url = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer" };    layer.Initialized += (a, b) =>     {      if (layer.IsInitialized && layer.InitializationFailure == null)       map1.Layers.Insert(1, layer);     };       layer.Initialize();

Is equivalent to:

   ArcGISDynamicMapServiceLayer layer = new ArcGISDynamicMapServiceLayer() { Url = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer" };    layer.Initialized += new EventHandler<EventArgs>(layer_Initialized);      layer.Initialize();   }    void layer_Initialized(object sender, EventArgs e)   {    var layer = sender as Layer;    if (layer.IsInitialized && layer.InitializationFailure == null)     map1.Layers.Insert(1, layer);   }

Re: Layer not initialized

LuisGarcia2 — Thu, 07 Jun 2012 16:40:10 GMT

Jennifer,
thanks! That works great.