* New certificate and secrete abstraction with certificate infrastructure and certificate/secret stores.
* leak testing for certificate resources to validate new ref counting in every test assembly
* Migration guide updated and documentation added for all
* Remove IDisposable from Nodestate and UserIdentity.
* UserCertificateTokenHandler now just points into certificate registry/stores, no dispose required
* Fix CA2000 warnings and cleanup of other diagnostics, increase warning levels in .editorconfig
* make most ptojects aot compatible
* Remove newtonsoft
* Migrate all projects from Mono.Options to System.CommandLine 2.0.5
* Fix array clone
* Replace serializers for storage using new attribute driven type geberator
* Add new AOT integration tests covering all functional areas
* Documentation updates
Generate stack and application code using source generators
Change built in types to readonly structs
Update localized text implementation to use JSON text serializer
Status code with symbolic names
Immutable node ids
No boxing for all built in types <= 8 bytes in Variant.
Split user identity token and token handling via token handler
Add migration guide for breaking changes
This pull request modernizes the OPC UA .NET codebase and tests, removes .NET Standard 2.0 support from certificate/security code, and updates test code to use C# 12 and .NET 8+ features for clarity and maintainability.
- Certificate and BouncyCastle interop files (e.g., CertificateBuilder.cs, X509Extensions.cs, X509SignatureFactory.cs) are refactored to drop NETSTANDARD2_0 support and use modern .NET APIs and conditional compilation.
- Test code across the codebase is updated to use default, strongly-typed Parse methods, collection expressions, and improved async/await patterns.
- Exception handling and assertions in tests are modernized, and test method naming is made consistent with Async suffixes.
- The project and build files are updated to clarify Roslynator analyzer usage and remove obsolete netstandard tags.
- General code and test cleanup includes improved null safety, type safety, and removal of deprecated or unused code.
Improvements for complex types.
- Support to encode/decode complex type structures with multidimensional arrays.
- Perf improvements for type loader using new NodeCache fetch multiple interfaces.
- DataTypeDictionary validation when dependencies are used.
- interface for complex type resolver, to build custom types in code.
- improvements of console client to demonstrate browse/read of custom values
+++ Breaking changes +++
IDecoder interface change of the `ReadArray` method
- Return type is now `Array` for all types of arrays. Previously the method returned an array for 1-dim and a `Matrix` type for multidimensional arrays. In addition the convention in generated code is to use `Collection` for all 1-dim arrays, and so was built the `BaseComplexType`. The new convention is to expose the native `Array` type from a complex type, in all cases, hence the return type of `ReadArray` was changed to reflect that for a consistent programming model.
- `ReadArray` has a new parameter `systemType` to efficiently read encodeable types. Previously the `Type` of an encodeable was determined by the encodingid and lookup in the type factory, even when the Type is already known by the caller. The 'old' style is still supported.
- `ReadArray` supports to read encodeable type arrays which are directly encoded in structures. These arrays differ from standard encoding of arrays and they are handled when `BuiltInType.Null` is used as parameter.
Marc Schier