ProjectTracker: lift TimeStamp into intermediate base classes

[rockfordlhotka]

Summary

• Demonstrates the pattern of an intermediate subclass between Csla.BusinessBase<T> / Csla.BusinessDocumentBase<T,C> and concrete BOs, where the intermediate declares its own registered properties that are inherited by every concrete BO.
• Lifts the TimeStamp (byte[]) concurrency token — present in all five candidate BOs — into ProjectTracker.Library.CslaBaseTypes.BusinessBase<T> and BusinessDocumentBase<T,C>. These two intermediate types existed previously but were empty shells.
• Fixes a latent bug: ResourceAssignmentEdit, ProjectResourceEdit, and RoleEdit wrote : BusinessBase<X> which (under using Csla;) silently bound to Csla.BusinessBase<T>, not the local intermediate. The intermediate was unused even where it looked otherwise. Now qualified to CslaBaseTypes.BusinessBase<X>.

Why this is useful as a sample

The CSLA documentation discusses application-wide intermediate base classes, but no sample demonstrated declaring registered properties on the intermediate. This change makes ProjectTracker a working reference for that pattern.

Notes

• The intermediate uses GetProperty(TimeStampProperty)! (null-forgiving) — the same pattern used inside the CSLA framework (e.g. DataPortalErrorInfo.cs). The CSLA0007 analyzer false-positives on this so a #pragma warning disable is applied with a comment explaining why.
• MobileFormatter handles inherited registered properties automatically — no extra serialization work needed.
• The Csla auto-implement source generator's base-class detection is a substring match on BusinessBase/BusinessDocumentBase, so the local-namespace intermediates work transparently.

Test plan

• dotnet build Samples/ProjectTracker/ProjectTracker.sln — clean (0 errors; only pre-existing NU1603 NuGet version warnings)
• Smoke-run the Blazor host: create/fetch/save Project and Resource to confirm the byte[] concurrency token round-trips through MobileFormatter when the BO crosses the data portal

🤖 Generated with Claude Code