SharpKml.Dom.Document' does not have a default constructor on HoloLens(UWP)

I am trying to read in a kml file for a HoloLens application. I am using the MRTKv2 with Unity.

My solution with SharpKml works fine in the player of Unity. But on the HoloLens an exception is thrown.

string fileURI = Path.Combine(Application.streamingAssetsPath, "lszh.kml");
var stream = File.Open(fileURI, FileMode.Open);
KmlFile file = KmlFile.Load(stream);

When the stream is loaded I get the following exception: System.ArgumentException: Type 'SharpKml.Dom.Document' does not have a default constructor Parameter name: type occurred

I suspect it has to do with the interaction between SharpKml and UWP.

Any ideas about what the problem might be?

[samcragg]

Thanks for the extra information. The stack trace seems to show the area of code I linked to earlier, looking like some of the reflection information is being stripped. I downloaded the emulator and ran the UWP application in release build without the debugger attached but it still worked fine. However, you mention that you’re using Unity, which does try to do some unused code stripping.

Unfortunately, I have no experience with Unity and, although I managed to get all the tools installed and ran one of the tutorials, I have to concede my limitations and am completely lost with how to write anything that would reproduce the issue.

Could I ask you try a link.xml file as per the previously linked Unity docs – if that fixes it then it looks like I can add a Preserve attribute to the actual assembly that would have the same affect and remove the need for you to include that file. Alternatively, I can create a pre-release package that has the attribute applied if you’d like to try using that instead, however, I don’t have the ability to test if it works.

Let me know which option works for you

[samcragg]

Thank you so much for testing that out and coming back with the fix!

I’ve added some documentation here and linked to it from the getting started page.