Unable to build release with .Net native toolchain

Description

A project incorporating the OpenXML package will fail to build in Release config if the build is set to use the .Net native toolchain (required for Store submision).

Information

• Target: UWP
• DocumentFormat.OpenXml Version: 2.9.0

Repro

• Create/Open a solution & project and add the OpenXML package
• Right-click on project in Solution Explorer and select “Properties”
• With Build selected, choose “Release” for Configuration and “All Platforms” for Platform
• Ensure “Compile with .Net Native tool chain” is ticked
• Build the solution for Release/x86

Observed

Build failure: Error MCG0037: MCG0037:InvalidCSharpIdentifierName Struct 'DocumentFormat.OpenXml.Validation.Schema.SdbAttributeConstraint' in assembly 'Assembly(Name=DocumentFormat.OpenXml, Version=2.9.0.0, Culture=neutral, PublicKeyToken=8fb06cb64d019a17)' has a field with name '<AttributeUse>k__BackingField' that is invalid. This could be because the name is obfuscated or the field is auto-implemented by the compiler. Please make sure the field name follows C# identifier conventions.

Expected

Successful build.

[twsouthwick]

This has been uploaded to NuGet as v2.9.1: https://www.nuget.org/packages/DocumentFormat.OpenXml/2.9.1

We don’t have a good process to vet .NET Native builds, so please file any other issues you find. We have it on the backlog (and I now have a sample app) to add support to run the unit tests on .NET Native…

[twsouthwick]

Thanks for reporting this! I have a fix that we’ll try to get out as quickly as possible (it’ll be 2.9.1).