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# Description Drops support for **netstandard2.1** and **.NET Framework 4.7.2**. Libraries now target `net48`, `net8.0`, `net9.0` and `net10.0`. `Opc.Ua.Types` and `Opc.Ua.SourceGeneration.Core` still also target `netstandard2.0`, but only because the Roslyn source generators load them. There is no general netstandard2.0 support. **Preprocessor directives** (112 files) - Every `#if`/`#elif` mentioning `NETSTANDARD2_1*`, `NET472*`, `NET_STANDARD_TESTS`, `SKIP_ECC_CERTIFICATE_REQUEST_SIGNING` or `NETSTANDARD*` was evaluated against the remaining TFM set (net48, net8/9/10, plus netstandard2.0 inside `Opc.Ua.Types`/`tools`) and simplified. Dead branches were removed. - Example: `NETSTANDARD2_1 || NET8_0_OR_GREATER` → `NET8_0_OR_GREATER`. - Example: `NET8_0_OR_GREATER || NET472_OR_GREATER` → removed (always true). - Netstandard-only code was removed: `UnixFileModeShim`, the CRDT reflection path in `ReplicatedGossipOptions.CreateReaderOptions`, and the netstandard2.1-only test variants. **Custom test logic** - `targets.props` drops the `net472`, `netstandard2.0` and `netstandard2.1` `CustomTestTarget` profiles, `NetStandardTests` and `SKIP_ECC_CERTIFICATE_REQUEST_SIGNING`. Supported values are now `net48`, `net8.0`, `net9.0`, `net10.0`. - The `NET_STANDARD_TESTS` define is removed from 29 test projects. - The "build netstandard shells as net10.0" overrides are removed from 18 projects. - `RestrictForLegacyTfm` now only applies to `net48`. - `tests/customtest.bat` is updated to the new values. **Build / packaging / CI** - MSBuild TFM conditions are simplified: Kestrel package choice, MQTTnet v4 (net48 only), BouncyCastle, Di/OpenUsd/Vision/Stress test excludes, and `System.IO.FileSystem.AccessControl` (dropped from Core). - The MigrationAnalyzer nuspec drops its net472/netstandard2.1 lib groups. The Azure signing lists are updated. - `get-ci-matrix.ps1` removes the net472/netstandard test profiles (including the PR-gating `linux-netstandard2.1`) and the matching build legs. **Breaking API change (2.0 preview):** removed `HttpsTransportListener.IsWssTransportSupported` and `ReplicatedGossipOptions.IsGossipStateDecodingSupported`. They only returned `false` on netstandard2.1 and are now always `true`. The test guards that used them were removed as well. **Docs** - NuGet READMEs, `README.md`, `DeveloperGuide.md`, `PubSub.md`, the certificate/ECC/identity docs and the 2.0 migration guide (plus its `.agents` skill mirror) are updated. - The migration guide notes that 4.7.2 consumers must move to 4.8 and netstandard2.1 consumers to net8.0+. ### Reviewer notes - The `System.IO.FileSystem.AccessControl` `PackageVersion` pin is left in `Directory.Packages.props`. It has no direct reference any more, but transitive pinning is on, so it was kept to avoid shifting resolved versions. - The `#if` rewrite was done mechanically by a truth-table evaluator. The diff in the `.cs` files is limited to directive lines, removed dead branches, and stale-comment updates. ### Verified locally - `dotnet build UA.slnx -p:CustomTestTarget=net48`: 0 errors. - `dotnet build UA.slnx -p:CustomTestTarget=net10.0`: 0 errors. - Default multi-target builds (no `CustomTestTarget`) of Opc.Ua.Types, Bindings.Https, PubSub.Mqtt and Redundancy.Server succeeded. - net10.0 tests: - Opc.Ua.Redundancy.Server.Tests: 840/840 passed. - Opc.Ua.Types.Tests: 11363 passed, 1 skipped. - ModelDependencyScanner tests: 20/20 passed. - The full test suite was **not** run locally. ## Related Issues - None ## 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. - [ ] 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. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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OPC UA .NET Standard — source generation core helpers
OPCFoundation.NetStandard.Opc.Ua.SourceGeneration.Core contains the
shared types used by the OPC UA source generators
(Opc.Ua.SourceGeneration, Opc.Ua.SourceGeneration.Stack) and the
runtime types the emitted proxies depend on. It is referenced
transitively from any package whose proxies are source-generated.
Overview
Reference this package directly only when you are authoring a custom source generator that participates in the OPC UA NodeSet emit pipeline.
Target frameworks
net48, netstandard2.0, net8.0,
net9.0, net10.0.
Additional documentation
See the main repository README and the guides for Source-Generated Data Types and Cross-Assembly Model Dependencies.