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romanett 9b034f8291 Enable nullable reference types centrally; migrate all unset and annotations-only projects (#4700) 
# Description

Nullable reference types are now enabled once, in `common.props`, and
every project in the repository builds warning-clean with them.

**Configuration**
- `<Nullable>enable</Nullable>` lives in `common.props`. All per-project
`<Nullable>` settings are removed: 178 project files (enable,
annotations, and the `disable` in the three Aot test projects).
- 419 per-file `#nullable enable`/`restore` directives and the 4
`#nullable disable` directives are removed.
- Kept on purpose:
- The 5 `<auto-generated>` schema files (`UANodeSet.cs`, `UA Type
Dictionary.cs`, `OPCBinarySchema.cs`, `SecuredApplication.cs`,
`PInvokeHelper.cs`) keep `#nullable enable`. The compiler ignores the
project setting in generated code, so the directive is required there.
- `tests/Opc.Ua.Interop.LegacyPeer` keeps `disable`. It builds against
the 1.5.378 packages and does not import the repository props.
- `docs/DeveloperGuide.md` and `.github/copilot-instructions.md` now
describe the central setting.

**Migration** (the 43 unset and 13 annotations-only projects, roughly
10k diagnostics)
- **Production code: annotated at the declarations.** Covers
`tools/Opc.Ua.SourceGeneration.Core`, `src/Opc.Ua.Lds.Server` and the
LDS sample.
- Members, parameters and returns are nullable where null actually
flows.
- Null-check helpers carry `[NotNullWhen]` (`IsNull`, `IsValidXmlName`,
`IsMethodTypeDesign`).
- `CoreUtils.Format`, `Utils.Format`, `ITemplateWriter.WriteLine` take
`params object?[]`. `Template.AddReplacement` takes `string?` (rendering
already skips null replacements).
- `IRegisteredServerStore.RegisterAsync` returns
`Task<RegistrationEntry?>`: it returns null when a registration is
removed.
- Dereferences backed by an invariant (for example, the validated model)
use `!`, so runtime behaviour is unchanged.
- **Behavioural changes in production code** (small, deliberate):
- `NodeSetToModelDesign` throws `InvalidOperationException` when the
file is not a NodeSet. Before, it threw a NullReferenceException on the
next line.
- `ModelDesignValidator` starts its lookup tables empty instead of null.
A redundant `if (m_nodes == null) return;` guard is gone.
- **Test code: minimal annotations.**
  - `?` on values that can be null, `!` where the test asserts non-null.
  - `= null!` for fixture members assigned in SetUp.
- `TryGetStructure<T>(out T? x)` where the inferred `T?` broke the
`IEncodeable` constraint.
- A few redundant `== null` checks on structs (`NodeId`, `ArrayOf<T>`)
folded into the adjacent `IsNull`/`Count` checks.

**Notes for reviewers**
- The diff is large (~1,500 files) but almost entirely mechanical: `?`,
`!` and directive removal. The non-annotation changes are listed above.
- Known follow-up, not done here:
`IModelDesign.Namespaces/TargetNamespace/NamespaceUris` stay
non-nullable even though the validator returns null before it loads a
dictionary. Making them nullable would ripple through every generator
call site.

## Related Issues

- Fixes #4439

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

The "no new warnings" box covers net10.0 and net48: full non-incremental
builds of `UA.slnx`, `tools/SourceGeneration.slnx`,
`tools/MigrationAnalyzer.slnx` and the Aot test projects finished with 0
warnings and 0 errors under the repository's warnings-as-errors
settings. net9.0 and net8.0 also had no nullable diagnostics, but they
were not rebuilt after the final fixes. Tests have not been run locally
yet.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
 2026-10-08 08:48:13 +02:00
Marc Schier 84fa8e8906 CTT follow-up: monitored items, alarms, codecs, history, and model validation (#4002) 
# Description

Follow-up to #3978 based on the latest OPC UA CTT aggregate, matrix,
Historical Access, Attribute, and Node Management runs.

## Aggregate run 16

- Ignore synthetic `BadBoundNotFound` raw-bound markers when feeding
aggregate calculators.
- Add direct and live historian regression coverage.

## Multi-dimensional Variant matrices

- Fix `Variant.Copy()` so rank-2 Variant matrices preserve their payload
and dimensions.
- Enforce valid Variant matrix dimensions consistently across Binary,
JSON, XML stream, and XML parser codecs.
- Encoders return `BadEncodingError`; decoders return `BadDecodingError`
for malformed matrix dimensions.
- Add cross-codec valid/null/empty/malformed tests and a batched
ReferenceServer Read regression.
- Correct the previous CTT issue attribution: the invalid
`Scalar_Static_Arrays2D_Variant` server encoding poisoned the batched
CTT Read.

## Node Management AddNodes

- Return `BadNodeIdRejected` for unsupported requested-NodeId
namespaces.
- Validate hierarchical ReferenceType source/target NodeClass
constraints.
- Document run-18 confirmation that all remaining 15 AddNodes errors are
CTT project/script configuration issues.

## Historical Access and Attribute Services run 18

- Reject whitespace in `NumericRange` syntax with
`BadIndexRangeInvalid`.
- Add HistoryRead tests for operation-level invalid syntax and
per-DataValue `BadIndexRangeNoData`.
- Document CTT defects:
- `012.js` expects `BadIndexRangeNoData` at the operation level instead
of on returned DataValues;
  - `Err-012.js` uses a non-historizing node for an access-denied test;
- generic Attribute array helpers omit NodeId[] and StatusCode[]
conversion paths.

## Base Information model validation run 19

- Run the CTT main session as `sysadmin` over Basic256Sha256
SignAndEncrypt so SecurityAdmin RolePermissions and EncryptionRequired
restrictions are both satisfied without weakening the server model.
- Preserve predefined well-known NodeIds while making generated dynamic
type and optional-child factories allocate compatible per-instance
NodeIds, remap internal references, and update references from the
owning subtree.
- Materialize dynamic RoleType properties through generated helpers and
keep role-child string NodeIds disjoint from numeric RoleManager root
IDs.
- Add net48/net10 regressions for generator output, NodeId
allocation/reference remapping, DI mandatory children, dynamic roles,
and low-privilege versus SecurityAdmin Browse visibility.
- Document CTT defects for permission-unaware mandatory-child
validation, the UA 1.04 reference model used against a UA 1.05 server,
stale ServerDiagnostics cache, and the `ConformanceUnits` scalar/array
mismatch.
## Related Issues

- Follow-up to #3960 and #3978.

## Checklist

- [x] I have signed the CLA and read the CONTRIBUTING document.
- [x] Tests prove the fixes and improve coverage.
- [x] Required CTT documentation is updated.
- [x] Focused builds/tests introduce no warnings.
- [x] Affected tests pass on .NET Framework and .NET 10.
- [ ] CI and CodeQL are green.
- [ ] All PR feedback is addressed.



## Latest CTT full run and A&C run 20

- Fix Monitor Value Change V2 `036.js`: an ambiguous
`DataValue(StatusCode)` call encoded `BadIndexRangeNoData` as a Good
value.
- Prove all 19 configured matrix monitored items notify when the
selected value actually changes; document the independent `042.js`
script defects.
- Rebase dynamic `CertificateExpired` / `TrustListOutOfDate` alarm roots
and descendants, restore standard type declarations and ModellingRules,
and expose the cross-node-manager references.
- Deliver method-triggered events to every authorized Session, fixing
the two-Session Confirm scenario.
- Preserve locale-only `LocalizedText` values consistently across
Binary, JSON, and XML and align Acknowledge/Confirm comment behavior and
tests.
- Document the remaining proven CTT defects for TransactionDiagnostics,
SemanticChange, History `013`, PolicyId scope, A&C, durable
subscriptions, and Subscription Minimum events.

## Base synchronization

Merged `master` through `007cfaf90` (`#4010`, repository layout
consolidation) and retained the matrix regression tests at their new
`tests/` locations.

## Latest validation

- Focused merged-tree tests pass on net10 and net48.
- `Opc.Ua.Server` and `Quickstarts.Servers` Release builds complete with
0 warnings and 0 errors on net10 and net48.
- The existing
`DisableEnableViaTypeAndInstanceMethodNoEventsDuringDisabledAsync`
timing test took its documented inconclusive timeout path after the
layout merge; no test failure was reported.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: romanett <romanett98@gmail.com>
 2026-07-18 05:01:03 +02:00