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Author SHA1 Message Date
5899354441 Clarify documentation, migration guidance, and SDK selection (#4823)
# Description

Remove stock phrasing and correct misleading or inconsistent technical
documentation. The initial two passes covered 367 Markdown files,
followed by an interactive review of 169 editorial flags. The U5
interpretation originally deferred in that review has since received the
upstream Mantis answer recorded by #4843; remaining server/spec
follow-ups stay explicit in the CTT log.

- Correct package responsibilities, migration steps, API names,
ownership, protocol descriptions and links. Keep bundled migration
guides synchronized. Preserve historical conclusions as historical
records with separate re-check notes.
- Provide at least two rendered TOC levels throughout `docs/`. Convert
appropriate architecture figures to Mermaid without changing code
examples, transcripts or historical quotations.
- Address the October 19 feedback with concrete setup/migration
instructions, corrected certificate paths and PubSub names, shorter
repeated caveats, consistent XML comments, and a full review of the
Concepts guide. Retain #4839's API corrections.
- Integrate #4841's runtime/performance guidance and review
incoming/recent prose. Preserve dated measurements rather than claiming
new benchmark runs; clarify allocation ratios, startup-only processor
settings, JIT warm-up and the benchmark commit's scope. Missing raw
measurement artifacts and repeat ranges remain tracked by #4842.
- Merge master through `e8c5d800a` in `32c6394b7`. Resolve the CTT log
conflict using the updated Mantis states and OPC answers, retaining
historical framing and re-checks for C28/C32/C43.
- Address the latest naming/index feedback in `adb5bf693`: rename the
guides to `docs/WotCon.md` and `docs/WotNodeSetConversion.md`; move the
provider and DataType-declaration contracts into the conversion guide
and remove `docs/WoT.md`. Rename `samples/DI` to `samples/Di` and
`samples/Isa95` to `samples/ISA95`. Add content-index READMEs to Di,
FluentApi, ISA95, Lds and PubSub; update solution entries, project
references, Docker/CI paths, test fixture paths and documentation links
with exact casing.

**WoT guide scope.** This branch retains the detailed conversion guide
that #4758 had replaced with an anchor stub. Conversion limits, verified
document sets, preservation rules and provider ownership now live
together in `WotNodeSetConversion.md`; binding/runtime guidance remains
in `WotBindings.md` and `WotCon.md`. The design-rationale/test-ledger
prose was shortened, the oversized argument-table cell moved into its
section, and existing anchors preserved.

**SDK policy is a separate, explicit user-directed change.**
`global.json` sets a stable minimum of `10.0.400`, `rollForward:
latestMajor`, and `allowPrerelease: false`. Newer major SDKs are
permitted; CI's explicit SDK pins are unchanged. README, GettingStarted,
DeveloperGuide and Recycling instructions reflect the possible analyzer
differences. The image-contract regression fix accepts compatible stable
SDK images instead of requiring exact equality with the floor.

The latest four rename/index threads are resolved after publication.
Three older threads remain open: universal obsolete-removal timing,
unconditional nonce-strength wording, and a blanket Vision NativeAOT
claim. Existing implementation/evidence constraints are explained in
their inline replies. The two-level TOCs remain as requested.

## Validation

- `git diff --check` and staged diff checks: passed. The untouched
upstream AutoID NodeSet retains its provenance bytes, including two
existing license-header trailing spaces.
- `.\.azurepipelines\validate-migration-plugin.ps1`: passed; 15 bundled
migration documents and manifests synchronized.
- Documentation/path validation: **101** documents retain two rendered
TOC levels (**2,228** entries), with idempotent formatting. **52** new
relative links and their anchors passed exact-case checks. No tracked
references to the old guide/sample paths remain. Both relocated
provider-contract sections are preserved in the destination.
- `dotnet sln UA.slnx list`: passed; shows the renamed Di/ISA95 projects
and the existing FluentApi/Lds/PubSub projects. Updated solution and
pump ProjectReference paths also passed exact-case existence checks.
- Latest focused commands, run from the repository root:

```powershell
# Passed: 61 channel send-order and reconnect tests.
dotnet test tests\Opc.Ua.Core.Tests\Opc.Ua.Core.Tests.csproj -p:CustomTestTarget=net10.0 --filter 'FullyQualifiedName~UaSCBinaryChannelSendOrderTests|FullyQualifiedName~TcpReconnectKeyAgreementTests' --verbosity minimal

# Passed: 5 pump datasheet tests; builds the renamed pump sample.
dotnet test tests\Opc.Ua.Di.Tests\Opc.Ua.Di.Tests.csproj -p:CustomTestTarget=net10.0 --filter 'FullyQualifiedName~PumpDatasheetConformanceTests' --verbosity minimal

# Passed: 4 repository NodeSet path/round-trip tests, including the moved pump models.
dotnet test tests\Opc.Ua.Types.Tests\Opc.Ua.Types.Tests.csproj -p:CustomTestTarget=net10.0 --filter 'FullyQualifiedName~RepositorySourceSurvivesSerializedLinkedPartitionsAsync' --verbosity minimal

# Passed: build, zero warnings/errors.
dotnet build samples\ISA95\MinimalIsa95Server\MinimalIsa95Server.csproj -p:CustomTestTarget=net10.0 -f net10.0 --verbosity minimal

# Passed: dependent sample-test project build, zero warnings/errors.
dotnet build tests\Opc.Ua.WotCon.Samples.Tests\Opc.Ua.WotCon.Samples.Tests.csproj -p:CustomTestTarget=net10.0 -f net10.0 --verbosity minimal
```

Earlier focused integration checks passed 2,620 tests across AutoID,
event queues/scheduling, source generation, MCP/package profiles and
WoT. Both reviewed Mermaid diagrams rendered locally without network
access. These checks are not a full solution run.

The full solution has **not** been rerun for this review. Earlier
`dotnet test UA.slnx -p:CustomTestTarget=net10.0 --verbosity quiet` did
not pass: three AOT projects rejected VSTest and 20 Vision tests failed
during graphics initialization with `OutOfMemoryException`. Remaining
long-running tests were stopped at the user's request. A focused Vision
rerun passed 558 tests and reproduced those 20 failures. The earlier
`dotnet test UA.slnx -p:CustomTestTarget=net48 --verbosity quiet` was
blocked by the former SDK pin and was not retried after the policy
change. The user approved proceeding with those limitations documented;
current remote CI is not claimed green.

## Related Issues

- Follow-up #4842 tracks the requested 2.0.2+ benchmark/tuning and
diagnostic-tool documentation refresh. #4841 supplies documentation and
earlier results, not all newly requested measurements.
- #4758 explains the conversion guide's earlier consolidation; the
current provider contracts are now consolidated into
`WotNodeSetConversion.md`.
- #4839 supplies the reviewed API corrections; #4843 supplies the
updated CTT issue record.
- The original prose cleanup and SDK policy were user-requested without
a source issue. No new runtime architecture is introduced by these
documentation edits.

## Checklist

_Put an `x` in the boxes that apply. You can complete these step by step
after opening the PR._

- [ ] 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.
- [ ] 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.

---------

Co-authored-by: Roman Ettlinger <romanett98@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-21 10:10:55 +02:00
romanettandClaude Opus 5.5 28f1401324 Server: cut request-path lock contention and allocation; add load harness (#4707)
Profiling the reference server under load showed most request-path CPU
spent spinning on contended locks, plus several avoidable allocations
per request or per node. This PR removes them, switches the reference
server to Server GC, and adds the load harness used to measure it.

## Results

Paired A/B against `master` (3 alternating rounds, medians, 20 sessions,
workstation GC on both sides, 24-core machine):

| Scenario | Throughput | p50 | p90 | Server CPU / op | Server alloc /
op | Lock contention |
|---|---|---|---|---|---|---|
| Read, 1 value | **+45%** (94k → 137k req/s) | −20% | −46% | −37% |
−39% | −94% |
| Read, 100 values | **+40%** | −26% | −17% | −24% | −25% | +130% ¹ |
| Read, 100 values, SignAndEncrypt | **+48%** | −36% | −20% | −30% |
−26% | +106% ¹ |
| Browse (Server object) | **+33%** | −31% | −12% | −13% | −14% | −40% |
| Write, 100 values | +13% | −12% | −4% | −10% | −19% | −23% |
| Data-change subscriptions | ±0 ² | ≈ | ≈ | −14% | −17% | −29% |

¹ The faster server spends more time in the remaining per-node locks.
² Throughput is bounded by the writer rate in this scenario.

Separately, Server GC instead of workstation GC doubles Read-100
throughput (21k → 44k req/s) and cuts p90 from 2.1 ms to 0.6 ms, because
workstation GC paused the server for about half the wall time under
load. The working set grows from ~210 MB to ~430 MB.

## Changes

- **`ObjectPool<T>`**: lock-free slot array. `ConcurrentBag.Count` took
every per-thread lock on each `Return` of the pooled response value-task
source, once per request.
- **`FairRequestQueue`**:
- drops redundant gate entries: the fail-fast pre-checks and the stopped
check read volatile fields and are re-checked under the gate; the owner
count is folded into selection;
- coalesces wake pulses with a pending flag, so the bounded signal
channel's lock is only taken when no token is outstanding. Wake-count
semantics in the tests are unchanged.
- **`DefaultServerResourceIsolationProvider`**:
  - compares peer addresses without `GetAddressBytes()` allocations;
- builds the unsecured verification context only when a classifier is
configured.
- **TCP listener / channel**: caches the certificate DER copies per
channel, keyed on the certificate instance. `X509Certificate2.RawData`
returns a fresh copy on every access, and the listener read it for every
request.
- **`EndpointBase`**: resolves the request `ActivitySource` once instead
of `Assembly.GetCallingAssembly()` per request.
- **Node managers**:
- one `ServerSystemContext` copy per request (cached on the
`OperationContext`) for per-node callbacks: permission metadata, node
metadata, view membership, method lookup;
  - removes a discarded copy in `GetReferenceDescriptionAsync`;
- per-request operation caches are plain `Dictionary` instead of a
`ConcurrentDictionary` with 24 lock objects;
  - the validation cache is built in one pass;
  - fixes zero-capacity error lists.
- **`ResourceManager`**: translation lookups read an immutable snapshot
that is rebuilt after writes. Browse serialised on the global lock for
every display name.
- **`MonitoredItem`**: shares the default `DataChangeFilter` instead of
allocating one per sampled value.
- **Reference server**: `ServerGarbageCollection=true`; new "Garbage
collector mode" section in `docs/ServerScalability.md`.
- **`perf/`**: `ServerLoadHarness` (out-of-process server plus load
driver, server-side CPU/GC/alloc/contention deltas, optional
`dotnet-trace` capture), `TraceAnalyzer` (TraceEvent-based
CPU/allocation/contention aggregation), and paired A/B scripts. Not part
of `UA.slnx`.

### Behaviour notes for custom node managers
- The `IDictionary<NodeId, NodeState>` operation cache handed to
overrides is now a `Dictionary`. It was a `ConcurrentDictionary`, but
only one request flow uses it.
- Within one request, per-node callbacks of a node manager share one
`ServerSystemContext` copy.

### Later commits on this PR
- **Permission checks without `NodeMetadata`** (`9068684c3`): the
role-permission and access-restriction validators run on an internal
`PermissionMetadata` struct; `AsyncCustomNodeManager` fills it on the
stack from the same attributes and namespace defaults. Browse's
reference filter reads 3 attributes per target instead of 13. Read 100
values: 120.6 → 95.7 KB/request, ~21k → 26k req/s; Browse 67.6 → 51.8
KB, 26.7k → 29.8k req/s.
- **Read-only channel evidence** (`936b28d76`, `dc638ab9f`):
`SecureChannelContext.ClientChannelCertificate`,
`ServerChannelCertificate` and `ChannelThumbprint` are `ByteString`, so
the cached per-channel certificate buffer is shared without a copy and
cannot be altered by handlers or classifiers. **Public API change**, see
the new section in `docs/MigrationGuide.md`. The isolation provider's
revalidation snapshot still copies.
- **Session lookup** (`936b28d76`):
`SessionManager.TryGetSessionContext` takes the candidate snapshot
without the bindings lock; the validating check under the lock is
unchanged (2 instead of 4 global lock acquisitions per request).
- Unit tests for `ObjectPool`, the per-request system context cache, the
translation snapshot, `SecureChannelContext` null semantics and a
stopped `FairRequestQueue`; `perf/` follows the repository conventions.

## Testing
- `Opc.Ua.Server.Tests` (net10.0): 8386 passed before the `ByteString`
change. After it, 13 secure-session and isolation tests failed; both
causes are fixed in `dc638ab9f` and those tests (25 with their variants)
pass. A full rerun of the Server, Sessions, Core, Redundancy, LDS and
GDS suites on the final commit is in progress.
- Full solution builds for net10.0 and net48; `dotnet format whitespace`
clean.

### o6-automation opcua-benchmarks (sampling, deep pipelines)
Replicated both tests of the [o6-automation
benchmark](https://github.com/o6-automation/opcua-benchmarks) in the
harness (`--scenario counters`, and `read` with 10 clients × N
outstanding), paired against `origin/master`:

| Test | master | this PR |
|---|---|---|
| Subscription sampling, 100 Hz, every item ≥ 99 % of samples, 1 item |
FAIL (75–94 %) | PASS (100 %) |
| same, 1024 items | FAIL (64–73 %) | PASS (99.9 %) |
| same, capacity | — | between 4096 and 6144 items (~410–520k samples/s)
|
| Read, 10 clients × 100 outstanding, None | stalls (0–1.7k req/s) |
121–131k req/s |
| Read, 10 clients × 100 outstanding, SignAndEncrypt | stalls (0 req/s)
| 89–91k req/s |
| Read, 10 clients × 1000 outstanding | channels faulted
(`BadTcpNotEnoughResources`) | 0 errors, ~45–54k req/s |

- **Fixed-rate sampling** (`30b769d13`): the sampling loop waited one
interval after each sample, adding timer overshoot and sampling time to
every cycle; samples now have absolute deadlines.
- **Async response send** (`cdac5c5ca`): `SendResponse` blocked
thread-pool workers on the channel gate; with many requests in flight
the receive loop that was handed the gate waited for a pool thread and
the channel stalled. The TCP, Kestrel TCP and WebSocket listeners now
use `SendResponseAsync`.
- **Backpressure instead of channel fault** (`191cd2ba7`): server
channels stop reading while more than 100 responses are queued and
resume at 50, instead of faulting the channel. Client channels keep
reading. At 10,000 outstanding requests throughput is ~50k req/s with or
without the limit engaged, so the remaining gap to the 100-per-client
case is not the backpressure.

## Not changed
- `SentMessageQueue` deep-clones every `NotificationMessage`. Retained
messages return their pooled payloads on acknowledgement while the
response copy may still be queued for send, and a client can acknowledge
a sequence number before receiving it; the clone keeps a recycled
payload from reaching another session's response. Removing it needs a
send-completion hook from the transport.
- Generated responses allocate a default `ResponseHeader` that is
replaced (~2-3 % of per-request allocation). Fixing it means making
structure fields of every generated type lazily initialized, a
generator-wide change to default values, equality and encoding.

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

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-09 13:00:49 +02:00
romanettandClaude Opus 5.5 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
de3476d332 Remove HTTPS binding dependency from server packages (#4297)
# Description

`Opc.Ua.Server` and `Opc.Ua.Gds.Server.Common` depended directly on
`Opc.Ua.Bindings.Https`, which pulled ASP.NET Core into server
applications
even when optional HTTPS-based transports were not used.

- Remove the HTTPS binding project references from Server and GDS
entirely.
- Add a Core-owned `IOpcUaTransportBuilder` contract for builders that
support
  transport registration.
- Move the type-preserving HTTPS, WSS, Kestrel OPC TCP, and Web API
fluent
  extensions into `Opc.Ua.Bindings.Https`.
- Remove the repository-wide `NoHttps` / `NOHTTPS` build switch.
- Keep ConsoleReferenceServer HTTPS/WSS support through an explicit
binding
  reference and the ASP.NET Core container runtime.
- Document that applications must reference the optional binding package
  directly.

## Validation

- Built `Opc.Ua.Bindings.Https` in Release for all target frameworks.
- Built Server and GDS for .NET 10 and .NET Framework 4.8.
- Built ConsoleReferenceServer and PumpDeviceIntegrationServer for .NET
10.
- Passed 65 HTTPS binding dependency-injection tests.
- Passed focused Server and GDS transport-builder tests.
- Verified refreshed Server/GDS restore assets and output manifests
contain no
  `Opc.Ua.Bindings.Https` dependency.

## Related Issues

Fixes #4296

## 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.
- [x] I have added tests that prove my fix is effective.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce build or analyzer
warnings.
- [ ] I ran all tests locally using the `UA.slnx` solution against .NET
Framework and .NET 10.
- [ ] I fixed all failing and flaky tests in the CI pipelines and all
CodeQL warnings.
- [x] I have addressed all PR feedback received.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com>
Co-authored-by: Marc Schier <mschier@microsoft.com>
Co-authored-by: romanett <7413710+romanett@users.noreply.github.com>
Copilot-Session: 41b98d43-8bb8-4587-8f3b-9532544dd582
2026-08-21 07:29:18 -07:00
d525bc3f28 Bound reconnect cleanup and organize samples by domain (#4276)
# Description

This PR fixes bounded ManagedSession reconnect cleanup and reorganizes
the sample applications into domain-focused folders.

## Reconnect cleanup

- Bounds reconnect integration cleanup with independent 30-second close
and dispose limits.
- Sends `CloseSession` through the awaited transport request path during
`Session.DisposeAsync`.
- Preserves explicit `Session.CloseAsync` behavior that waits for or
cancels outstanding publish requests.
- Covers the disposal request path with a regression test.

## Sample organization

- `samples/OpenUsd`: `GeneratorServer`, `SiteCompositionServer`
- `samples/Redundancy`: `RedundantClient`, `RedundantServer`,
`RedundantPubSub`
- `samples/Isa95`: `MinimalIsa95Server`
- `samples/MinimalApi`: `MinimalBoilerServer`, `MinimalCalcServer`,
`MinimalClient`
- `samples/DI`: `PumpDeviceIntegrationServer`
- `samples/Lds`: `ConsoleLdsServer`
- `samples/Reference`: `ConsoleReferenceClient`,
`ConsoleReferenceServer`
- `samples/PubSub`: `ConsoleReferencePubSubClient`

`UA.slnx` now exposes the same requested domain groups. Project
references, tests, runtime sample probes, CI workflows, Dockerfiles,
Compose files, helper scripts, and documentation were updated to the new
paths. `samples/Robotics/MinimalRobotServer` remains under `Robotics`.

## Validation

- `dotnet build UA.slnx`
- 3 Redundancy short-haul sample tests
- 70 DI sample tests
- 914 OpenUSD tests
- 1 WotCon model-materialization test
- 137 AOT tests
- `docker compose config` for all 6 moved Redundancy Compose files

## Related Issues

- Fixes #4273

## 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.
- [x] 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.
- [x] I built the complete `UA.slnx` solution locally.
- [ ] I ran all tests locally against at least .NET Framework and .NET
10.
- [ ] I fixed all failing and flaky tests in the CI pipelines and all
CodeQL warnings.
- [x] I have addressed all PR feedback received.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com>
Co-authored-by: Marc Schier <mschier@microsoft.com>
Co-authored-by: Marc Schier <marcschier@users.noreply.github.com>
Copilot-Session: a2c2838f-74ae-4997-a1d4-50574d9e0636
2026-08-21 04:35:47 +00:00