WI01086104 - Fix Group 1 NRE: empty-parent AddNew on RelatedCurrencyManager

[FahmiFuzi]

Summary

Fixes the .NET 10 Group 1 NullReferenceException failures (39 failures in crikey run 27ca6b55) by replicating the .NET Framework ZBindingContext.ParentCurrentChangedHandler empty-parent behavior in the fork's rewired CurrentChanged handler path.

When a parent currency manager has no current row (Count == 0), the child manager now binds an empty list (AllowNew=false) instead of calling AddNew(), which materializes orphaned business objects whose SetDefaultsForNewChild/property getters dereference null parent navigations.

Changes

RelatedCurrencyManager.cs:

1. RewireParentChangeHandler: Wires parent CurrentChanged to new ParentManager_CurrentChanged (instead of stock handler) and primes through it.

2. New ParentManager_CurrentChanged (port of FW ParentCurrentChangedHandler):

   • Empty parent (Count == 0) → SetDataSource(new BindingList<object> { AllowNew=false, AllowEdit=false, AllowRemove=false }) + listposition = -1 + raise OnPositionChanged/OnCurrentChanged/OnCurrentItemChanged
   • Non-empty parent → delegate to stock ParentManager_CurrentItemChanged

3. ParentManager_CurrentItemChanged: One-line guard change (combines with LV1 WI01086017):

   • else → else if (currencyManager.List is IBindingList { AllowNew: true })
   • Skips AddNew on read-only lists (including the empty placeholder for rewired managers)
   • Everett body unchanged

Why This Works

Ctor-priming coverage: EnsureListManager is recursive — each parent manager is registered + rewired before the next child is constructed. By the time a child's constructor primes, its empty parent already holds the AllowNew=false placeholder and the guard skips the Everett AddNew. This is the same inter-construction interception window that .NET Framework's BindingContextHashtable.Add used.

Guard+placeholder are interdependent: Without the guard, AddNew on the placeholder BindingList<object> would insert a bare object() and _fieldInfo.GetValue would throw.

Test Plan

• Customs.DE ExitSummaryPlugInTest.TestBashUserControlOfPlugIn (was NRE in SetDefaultsForNewChild) — PASS
• MarketingManager GlbCompanyCampaignFormTest.TestBashingForm (was NRE in get_TrackingStatusDescription) — NRE eliminated (0 signatures in TRX)
• Earlier broad run: 23/23 tests across 11 assemblies NRE-free (12 full PASS, 11 fail on pre-existing Group 7 ZGrid/DataGrid issues)

Residual Issues

Tests that still fail after the fix fail on previously-masked issues (not Group 1):

• Legacy DataGrid GridColumnStylesCollection index out-of-range
• ZGrid ColumnName validation (Group 7)
• Layout/translation assertions (Group 9)

These are separate from the Group 1 NRE and can be addressed in follow-up work.

Notes

• StyleCop SA1513: comments cannot sit between } and else if — moved inside the block
• To ship: pack WTG.Windows.Forms (use Create Release GH workflow per src/System.Windows.Forms.Legacy/how-to-release-nuget-package.md) and bump CargoWise Directory.Packages.props from 0.2.2-pr.17.1

Co-authored-by: Fahmi Fuzi fahmi.fuzi@wisetechglobal.com

Microsoft Reviewers: Open in CodeFlow

[FahmiFuzi]

Wrong repo — closing and recreating in WiseTechGlobal/winforms

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