MissingRuntimeArtifactException on Xamarin.Forms App with .Net Native Toolchain Enabled

Question

i've a Xamarin.Forms application (UWP, using .Net Standard 2.0; Target Windows Version: 10 Fall Creators Update), that runs perfect without .NET Native toolchain. But when i enable the .Net Native Toolchain in the project settings, i retrieve exceptions during runtime:

System.Reflection.MissingRuntimeArtifactException: 'Cannot retrieve a MethodInfo for this delegate because the method it targeted (Void Xamarin.Forms.Platform.UWP.Platform.OnPageAlert(Object, AlertArguments)) was not enabled for metadata using the Dynamic attribute. For more information, please visit http://go.microsoft.com/fwlink/?LinkID=616868'

It seems that i have to modify the default.rd.xml file in my UWP project. But i don't know exactly how to.

I added

<Type Name="Xamarin.Forms.Platform.UWP.Platform" Serialize="Required All" Dynamic="Required All"/>

but with no result. Same exception as before. Can someone give me the hint, how to solve that issue?

cheers, Chris

Not so sure whether it works but official doc shares something related to this kind of exception. See here What about give it a try? — Barry Wang
You mean including the Assemby? I already did it with same result ;( — The Chris

magicandre1981 magicandre1981 · Accepted Answer · 2020-01-20T15:41:35

I had the same error today in debug mode for ARM64, here .Net Native is always enabled, and here I added those entries to Default.rd.xml

<Type Name="Xamarin.Forms.Platform.UWP.WindowsPlatformServices" Serialize="Required All" />
<Type Name="Xamarin.Forms.Platform.UWP.Platform" Serialize="Required All" Dynamic="Required All">
  <MethodInstantiation Name="OnPageAlert" Arguments="System.Object" Dynamic="Required" />
</Type>

Now the error message was gone.

MissingRuntimeArtifactException on Xamarin.Forms App with .Net Native Toolchain Enabled

1 Answers