Dynamically add layer to map and populating sublayers on a list/check box.

Question

Hi All,
This thread  subLayers, Listbox and symbology does half of what I'm looking to accomplish.
The other half is I am looking not to have the layers hard coded in the XAML I�??m looking to (1) have users enter the URL like here #AddLayerDynamically   then  (2)the Sublayers (including any hierarchy) would be listed with checkboxs somwhat like here #SubLayerList.

This probably means most of the code will be done in codebehind c# then bound to respective elements in the XAML

I�??m very new to Silverlight. I�??ve been trying to do this for ages but no joy. Any help would be very much appreciated.

BlueRace · Answer

Many thanks Joe. I'll give it a bash and let you know how I get on.

Just looking at the code you've provided, it is apparent it does what I want.

It's just my inability to grasp the silverlight concept that is making me unable to do what I want to do...

In this light I shall mark your answer as the right answer.

If I manage to put something that works together I shall post that here as well for the benefit of others.

Many thanks
blueRace

JoeHershman · Answer

Many thanks Joe for the tips, code and advice. I really appreciate it. I thought by picking a "project" I would grasp the concepts quicker but this is proving elusive with silverlight for me. Any way will keep at it. Just so we are on the same page, and for the benefits of other who may or may not be in the same predicament as me this is what I am looking to do 1. User enters a URL to a Map service, (see link above) - Currently this sample works for Tiled services - Looking to eventually extend this so service type doesn't matter. 2. With no map displayed on the map canvas yet, the sub-layers, if any, would be listed - in a folder or tree fashion. 3. User selects a sub-layer, and can at this point add it to or display it on the map canvas. And at this point it can be added to the legend control. A few things that impact what it seems like you want to do.* Only Services can be added to a Map, the closest you could come to what you propose would be to add the service and have only the selected sublayer visible. * Only ArcGISDynamicMapServiceLayer object can have visibility of sub layers changed. Tiled services can be added as ArcGISDynamicMapServiceLayer, but the performance benefits of tiled service would be lost. That only makes sense if you think about it, at the most basic level a Tiled service is a set of pre-created images served up when requested, so they cannot be changed. * You can build the tree as you want but it is a bit convoluted in how it is done. A map service contains a LayerInfo collection which includes info about all the layers in the map that the service is created from (the object naming is terrible, imo). The LayerInfo object has a collection of SublayerIds. You have to go through and figure what is a sublayer of what The attached does pretty much what it seems you want as far as building the tree, there is too much there to try and just put code snippets. The TocViewModel contains code that builds a MapServiceLayer objects collection, Each MapServiceLayer represents a service and the layers/sublayers are then in its ObservableCollection. I broke it out into two object type a MapGroup an MapServiceLayer, a MapServiceLayer is a MapGroup but defines the actual service. A MapGroup has its own MapGroup collection which has 0 or more elements. This works on the layers in an existing map but the principle would be the same. I bound the ObservableCollection to a treeview using HierarchicalDataTemplate like in my earlier post. Hope that helps -Joe CreateTOC.zip Captura de pantalla 2026-06-01 145322.png

BlueRace · Answer

Many thanks Joe for the tips, code and advice. I really appreciate it. I thought by picking a "project" I would grasp the concepts quicker but this is proving elusive with silverlight for me. Any way will keep at it.

Just so we are on the same page, and for the benefits of other who may or may not be in the same predicament as me this is what I am looking to do

1. User enters a URL to a Map service, (see link above) - Currently this sample works for Tiled services - Looking to eventually extend this so service type doesn't matter.

2. With no map displayed on the map canvas yet, the sub-layers, if any, would be listed - in a folder or tree fashion.

3. User selects a sub-layer, and can at this point add it to or display it on the map canvas. And at this point it can be added to the legend control.