UWP apps having nullable DateTime-properties compiled with the NET Native Toolchain crashes

[Nilzor]

I'm saying "stuff" because I really have no idea what the cause or even the exact scenario under which this happens. The error occurs only when doing release builds with the .NET Native toolchain enabled, which is a prerequisite for being allowed to publish on the Windows 10 Store

I'm getting IllegalOperationException "Attempt to read/load private field property in managed properties" sometimes when doing GetProperty. The exception breaks on the GetPropetry-line itself

My property is defined as follows:

public readonly static PropertyInfo<DateTime?> DueProperty = RegisterProperty<DateTime?>(c => c.Due);
public DateTime? Due
{
    get { return GetProperty(DueProperty); }
    set { SetProperty(DueProperty, value); }
}

I'll see if I can make a reproducable example solution later. I'm running Windows 10586 and the latest CSLA_UWP as of today.

[rockfordlhotka]

You may be running into a case where the native compiler is optimizing away parts of your code that you need, but it can't identify that you need (e.g. anything invoked via reflection or dynamic code).

You might try adding a <assemblyname>.rd.xml file to your project in the Properties folder to prevent that optimization. For example:

<?xml version="1.0" encoding="utf-8"?>
<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
  <Library Name="Csla.Uwp">
    <Assembly Name="Csla" Activate="Required All" Browse="Required All" Serialize="Required All" Dynamic="Required All" />
  </Library>
</Directives>

From here: https://github.com/MarimerLLC/csla/blob/master/Source/Csla.Uwp/Properties/Csla.Uwp.rd.xml

Replace the library name and assembly name with your project's values.

[Nilzor]

Sounds like a good theory. I couldn't immediately get it working though but I'll try more tomorrow, maybe on a simpler project.

Am I to place the file in the main UWP app project, or in the library project that depends on CSLA? Or both? Is "Library name" the name the is displayed in the Solution Explorer?

[Nilzor]

I have now tested further with a clean test project and found that it only happens with Nullable DateTime properties. Maybe others as well, but that's the one that breaks it for me.

I haven't been able to amend the problem yet. Would be awesome if you or someone else could look at it:

https://github.com/Nilzor/csla-uwp-ntcfail

[rockfordlhotka]

I don't see the problem occurring with the current version of UWP and related tooling. It seemed unlikely that it was a CSLA issue before, and this would appear to confirm that it was a UWP issue that Microsoft must have resolved.

[github-actions]

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