[UWP] [.NET] Cannot Build Due to Missing References in Packages

In 2018.1b13, I cannot build for UWP .NET (not IL2CPP). When attempting to do so, I just get errors about missing several System methods, such as Type.IsSubclassOf.

Code (csharp):

1. C:\ProgramData\Unity\cache\packages\packages.unity.com\com.unity.render-pipelines.core@1.1.2-preview\CoreRP\Volume\VolumeProfile.cs(95,41): error CS1061: 'Type' does not contain a definition for 'IsSubclassOf' and no extension method 'IsSubclassOf' accepting a first argument of type 'Type' could be found (are you missing a using directive or an assembly reference?)

 

Sure - though I figured this issue was obvious and straightforward enough that there might already be a workaround.

it is now Case 1023074

 

It seems that Type.IsSubclassOf only exists since .NET Core 2.0:
https://docs.microsoft.com/fr-fr/do...k-4.7.2#System_Type_IsSubclassOf_System_Type_

Prior to .NET Core 2.0, TypeInfo.IsSubclassOf(Type) should work:
https://docs.microsoft.com/fr-fr/do...Reflection_TypeInfo_IsSubclassOf_System_Type_

Does it work with TypeInfo.IsSubclassOf(Type)?