Can't get my data to show in Silverlight

StephenLead · ‎08-11-2010

Hi everyone,

I need some help with a quick ArcGIS Server question. I'm running ArcGIS Server 10 on XP, with Visual Studio 2010 and Silverlight 4.

Everything is working correctly when using the sample ESRI servers, but I'm having problems with my Silverlight app seeing my ArcGIS Server services.

A simple example using a sample ESRI server is:

<UserControl x:Class="SilverlightApplication1.MainPage"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:esri="http://schemas.esri.com/arcgis/client/2009">
    <Grid x:Name="LayoutRoot">

        <esri:Map x:Name="MyMap" >
            <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer"
           Url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"/>
        </esri:Map>

    </Grid>
</UserControl>

This opens correctly and shows a world map. If I replace the URL line with Url="http://qsq-brcon15-pc/ArcGIS/rest/services/Atlas_geology/MapServer"/> the app opens and shows the "powered by ESRI" logo, but no map content is shown. If I open the Rest Services page, I can see that this is a valid tiled service (full details below). If I choose "View In ArcGIS JavaScript" the dataset displays correctly.

The same thing happens with Feature and Dynamic layers. It appears that Silverlight is installed correctly, and ArcGIS Server is working correctly, but for some reason they're not talking to each other.

Do you have any suggestions for how I can debug this?

Thanks,
Steve

ArcGIS Services Directory       Home > Atlas_geology (MapServer)   Help | API Reference     Atlas_geology (MapServer)

View In:    ArcMap   ArcGIS Explorer   ArcGIS JavaScript   Google Earth   ArcGIS.com Map   Bing Maps (terms of use)

View Footprint In:    Google Earth

Service Description:

Map Name: Layers

All Layers and Tables

Layers:

Geological types (0)

Tables:

Description:

Copyright Text:

Spatial Reference: 3857

Single Fused Map Cache: true

Tile Info:

Height: 256

Width: 256

DPI: 96

Levels of Detail: (# Levels: 5)

Level ID: 0 [Start Tile, End Tile]

Level ID: 1 [Start Tile, End Tile]

Level ID: 2 [Start Tile, End Tile]

Level ID: 3 [Start Tile, End Tile]

Level ID: 4 [Start Tile, End Tile]

Format: PNG8

Compression Quality: 0

Origin:

Spatial Reference: 3857

Intial Extent:

Full Extent:

Units: esriMeters

Supported Image Format Types: PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,AI,BMP

Document Info:

Title: Geology fGDB

Author: slead

Comments:

Subject:

Category:

Keywords:

Credits:

Supported Interfaces: REST SOAP

Supported Operations: Export Map Identify Find Generate KML

KatjaKrivoruchko · ‎08-11-2010

Do you have clientaccesspolicy.xml or crossdomain.xml file on your web server? Please see the following for more info:

1. http://msdn.microsoft.com/en-us/library/cc197955%28VS.95%29.aspx.
2. http://blogs.esri.com/Dev/blogs/silverlightwpf/archive/2009/08/24/Troubleshooting-blank-layers.aspx

JenniferNery · ‎08-11-2010

To debug, you can use Fiddler and investigate the web requests and responses there, so you'll know at which step it failed to load/initialize your layer.

Jennifer

StephenLead · ‎08-11-2010

Do you have clientaccesspolicy.xml or crossdomain.xml file on your web server?

Genius - that was the problem. Thanks very much for your help! That blog post is great.

Thanks also for the tips on Fiddler, which may prove useful in further debugging.

StephenLead · ‎08-12-2010

Slightly unrelated question.... In the ESRI blog post there is some C# code:

private void layer_InitializationFailed(object sender, EventArgs e)
{
Layer layer = sender as Layer;
MessageBox.Show(string.Format("Layer '{0}' is currently unavailable. Error: {1}",
     layer.ID, layer.InitializationFailure.Message));
}

What's the VB.Net equivalent? I've tried the code below but this doesn't show an error message when I deliberately use a layer which doesn't exist:

Private Sub layer_InitializationFailed(ByVal sender As Object, ByVal e As EventArgs)
        Dim layer As Layer
        sender = layer
        MessageBox.Show(layer.ID, layer.InitializationFailure.Message, MessageBoxButton.OK)
End Sub

Thanks,
Steve

JenniferNery · ‎08-12-2010

I think you were close but you missed the TryCast.

Private Sub layer_InitializationFailed(sender As Object, e As EventArgs)
 Dim layer As Layer = TryCast(sender, Layer)
 MessageBox.Show(String.Format("Layer '{0}' is currently unavailable. Error: {1}", layer.ID, layer.InitializationFailure.Message))
End Sub

This is a useful link for C# to VB conversion: http://www.developerfusion.com/tools/convert/csharp-to-vb/

Jennifer

StephenLead · ‎08-12-2010

awesome, thanks again.

VickyP · ‎12-14-2011

awesome, thanks again.

Hi Stevel,

Did you get any success? I am also facing the same problem, I tried with SilverLight 4 + .NET framework 4.0 and ArcGIS Server 10, SilverLight 4 + .NET framework 3.5 and ArcGIS Server 10, still I am unable to see the map inside my SilverLight app. I tried clearing the REST cache, still no success, Now I will try with Fiddler.

If you know the solution, then please share with me.

StephenLead · ‎12-15-2011

Hi Varun,

I ended up using the JavaScript API, which suited my client's purposes better. So I haven't used the Silverlight API at all since I posted this question.

Sorry I can't help out.

Good luck,
Steve

VickyP · ‎12-25-2011

Hi Varun,

I ended up using the JavaScript API, which suited my client's purposes better. So I haven't used the Silverlight API at all since I posted this question.

Sorry I can't help out.

Good luck,
Steve

Hi Steve,

Thanks for replying, I have solved the problem, you should have clientaccesspolicy.xml file in the webserver (iis) inside inetpub folder of the system in which ArcGIS SERVER is installed