Latest Contributions by ThadTilton

‎01-02-2025

Hi Dien, Please check your Visual Studio Output window when running your app. If the problem is with the API key, you'll see something like this in the debug output: ArcGIS Maps SDK: The API key 'xyz' is invalid, expired or does not have access to the resource. - 'https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/webmaps/arcgis/topographic'. Please visit https://developers.arcgis.com/api-keys to configure the API key to access the resource, or to create a new API key. ArcGIS Maps SDK: Load Error: Basemap Esri.ArcGISRuntime.Http.ArcGISWebException The provided APIKey is invalid, expired or does not have access to the resource.

‎06-27-2024

More information here: https://developers.arcgis.com/net/license-and-deployment/use-a-license-in-your-app/#how-to-use-a-license-string-in-your-app

‎01-10-2024

I believe the WMS service defines a list of supported spatial references that you can use. If you check the capabilities for the service here: https://crop.csiss.gmu.edu/cgi-bin/wms_cdl_ia/cdl_2020_ia/wms?SERVICE=WMS&REQUEST=GetCapabilities You'll see that the layers define the following spatial references (CRS): <CRS>epsg:5070</CRS> <CRS>epsg:102004</CRS> <CRS>epsg:4326</CRS>

‎12-08-2023

I tested your code using the ArcGIS Maps SDKs for .NET samples and it worked as expected. Maybe this can help you troubleshoot (?). Using the "Display feature layers" sample, I added the following lines from your code at this location: https://github.com/Esri/arcgis-maps-sdk-dotnet-samples/blob/main/src/WPF/WPF.Viewer/Samples/Layers/DisplayFeatureLayers/DisplayFeatureLayers.xaml.cs#L156 QueryParameters queryParams = new QueryParameters { WhereClause = "" }; //all FeatureQueryResult result = await trailheadsGeodatabaseFeatureTable.QueryFeaturesAsync(queryParams); IEnumerable<ArcGISFeature> features = result.Cast<ArcGISFeature>(); int count = features.Count(); //break here, 0 results???? For this geodatabase, 'count' had a value of 475.

‎11-01-2023

OK, with the help of some colleagues here on the Maps SDK .NET team, I think we've narrowed down the issue. If you look at the raw JSON for either of the layers, you'll see templates defined that look something like this: "templates" : [ { "name" : "Nor Reviewed", "description" : "", "drawingTool" : "esriFeatureEditToolPoint", "prototype" : { "attributes" : { "Id" : "false" } } } ] The template refers to the ID field (or GlobalID in others). Those fields store GUID types but the template specifies a value of "true" or "false". When trying to load the layer, Maps SDK for .NET fails when parsing that because it can't convert those values to a UUID. I'm not sure how this definition is authored, but if you can find a way to remove that or reauthor the definition to exclude those settings, the layers should load as expected.

‎11-01-2023

Hi Pierre, I queried all the GUID and GlobalID fields in the pipes and manholes layers and checked them in a simple .NET program to see if they were valid. I wasn't able to find any invalid GUIDs. I also brought the layers into Pro and wasn't able to find anything unusual. Perhaps I can try to reproduce this with some of my own data and try to narrow down the issue.

‎10-31-2023

I get "the username you entered is not part of this organization" when I try to access it.

‎10-30-2023

Hi Pierre, I'm not sure what's going on here. I wonder if the error is complaining about the ID that's used to identify the layer in the FeatureService portal item. The value of "i" in this line of code: var featureLayer1 = new FeatureLayer(item, i) { MinScale = 500000000, MaxScale = 1 };

‎10-30-2023

There are lots of resources you might use in your app that require authentication, either with an API key, user authentication, or some other approach (see the Types of authentication doc topic for more info). API keys are commonly used for access to location services such as basemaps, geocoding, and routing. User authentication (such as OAuth) is often used so your app can gain access to private content or subscription services. There are a variety of factors that might guide you towards using one or the other and you might even use more than one in your app. For example, if you wanted to use user authentication for accessing private content, but also use an API key only for the basemap, you could set the basemap key with code like this: map.Basemap.ApiKey = "YOUR_API_KEY"; It looks like setting the API key globally for the app (ArcGISRuntimeEnvironment.ApiKey) caused the app to attempt to use the API key to access the private content rather than user authentication. I would expect the app to fall back to user authentication if the API key can't provide access, but it doesn't seem to work that way. I think we need to improve our documentation to describe some of these workflows a little better. I'm glad you were able to get it working, though! 👍

‎10-28-2023

As for the differences between the tutorial and sample code, they're actually doing the same thing. In fact, the AuthenticationHelper class in the tutorial is based on the ArcGISLoginPrompt class used in the sample. The essential code from that class was used in the tutorial and simplified as much as possible. For example, the RegisterSecureServer function in the tutorial is a simplified version of the sample's SetChallengeHandler function (the lines in that function to set the ChallengeHander and OAuthAuthorizeHander were simply added to the AuthenticationHelper's constructor in the tutorial version). PromptCredentialAsync() are identical in both, as is the OAuthAuthorizeHandler class. It's worth exploring why they seem to be behaving differently. Perhaps there are some key differences outside this code that contribute to that.

‎10-28-2023

Hi Brian, I was able to tinker with this a bit today. I think I ran into the same problem you described and I was able to find a solution. For me, I found that having an API key set prevented the app from challenging for the secured web map. With the API key defined (in App.OnStartup), the app would throw an exception that said I don't have permission to access the resource (without challenging me for a login). If I commented out the line that set the API key, I was challenged for username/password and the secure webmap loaded as expected. It seems that the app was trying to authenticate with the API key and didn't try to use OAuth at that point. I think this works with the tutorial data because it's authenticating for a single (premium) layer rather than for a secure (private) web map item. In this case, it seems to effectively use the API key for the basemap layer and OAuth for the traffic layer. I think it's a little unclear how the API key and user authentication work together. I think this needs some better documentation. Looking at the developer guide, I found a description of setting an API key's scope to allow access to private ArcGIS Online items. This is currently in beta and has some limitations. The API key tutorial also describes the steps to enable that access. You might want to try following the instructions to scope your API key to access your web map and see if you can access it without using OAuth. Another option is to try just commenting out the line that sets the API key (in your project based on the tutorial) and see if OAuth challenges the user for access. -Thad

‎10-25-2023

Also, you might find this useful for determining the relative scale value for various "zoom levels" (world, region, city, street, etc): Zoom level to scale converter (it's a little hidden on the page, you need to expand the link that says "Zoom level to scale converter")

‎10-25-2023

Hi! The SetViewpointScaleAsync() method takes a double to represent the scale (not a Viewpoint). It will zoom in to the current center point. Try it with just the value 5000 and see if that works. If you want to provide a specific point to zoom to (at a specified scale), try SetViewpointAsync() and provide a Viewpoint that defines a point and a scale (as you've done above). I hope that helps! Thad

‎10-19-2023

If you successfully log in with OAuth, you don't need to provide an API key. If it works for the map used in the sample but not for your map, perhaps the account you're logging in with does not have the expected access to that map. If you log in to ArcGIS Online with the same creds, can you access the web map?

‎10-17-2023

You could achieve this using a geoprocessing task to create the individual viewsheds and display them as graphics overlays. It would be a much less dynamic user experience, but it would work fine for some use cases. See the .NET sample for viewshed with a geoprocessing service: https://developers.arcgis.com/net/winui/sample-code/analyze-viewshed-geoprocessing/ Perhaps even a hybrid approach, where one viewshed comes from the geoprocessing task (displayed as graphics) and the other is from the analysis overlay?

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Date Last Visited	‎04-15-2025 01:40 PM

My Ideas

Latest Contributions by ThadTilton

Re: Not be able to display map on .net MAUI even with correct API Key

Re: Using ArcGIS Map SDK MapView control inside of ArcGIS Pro leads to "Licensed for Developers Use Only"

Re: Issue in Displaying WMS Layer with Different Spatial Reference on Map

Re: Unable to enumerate features in feature layer table.

Re: ArcGISRuntimeException when loading a FeatureLayer - Unknown error: invalid uuid string

Re: ArcGISRuntimeException when loading a FeatureLayer - Unknown error: invalid uuid string

Re: ArcGISRuntimeException when loading a FeatureLayer - Unknown error: invalid uuid string

Re: ArcGISRuntimeException when loading a FeatureLayer - Unknown error: invalid uuid string

Re: Help with OAuth

Re: Help with OAuth

Re: Help with OAuth

Re: Zoom to Street level from World level

Re: Zoom to Street level from World level

Re: Help with OAuth

Re: Can not define different VisibleColors for two different LocationViewsheds respectively

Re: How to obtain latitude and longitude coordinat...

Re: Not be able to display map on .net MAUI even w...

Re: Clone GraphicsOverlay

Re: Can not define different VisibleColors for two...

Re: Help with OAuth