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romanett
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## Summary Adds hand-written partial state classes that enforce OPC UA Part 8 §5.3.3 write validation for the `DiscreteItemType` subtypes, plus tests. ## Details - **`MultiStateDiscreteState`** — a written value is treated as an index into `EnumStrings`. Returns `BadOutOfRange` when the index is outside `[0, len)`. - **`MultiStateValueDiscreteState`** — a written value is matched against the sparse `EnumValues` set. Returns `BadOutOfRange` when no entry matches. On a good write, `ValueAsText` is refreshed from the matching entry's display name. - **`DiscreteItemState`** — provides the shared `TryGetIntegerValue` helper that normalizes any scalar integer built-in type to `long` (the exact-type `Variant` accessors return `default` on a built-in-type mismatch, so a `BuiltInType` switch is required). - **`TwoStateDiscreteType`** intentionally has no hand-written class. These 3 classes are `public partial class` extending the source-generated DataAccess partials already present on `master`. They read via the typed properties (`EnumStrings`, `EnumValues`, `ValueAsText`) rather than `FindChild`, because `BaseDataVariableState.FindChild` special-cases the `EnumStrings` BrowseName and never falls through to the `AddChild`'d children. ## Testing - `dotnet build src\Opc.Ua.Core.Types\Opc.Ua.Core.Types.csproj -c Release -f net10.0` → 0 warnings, 0 errors. - 13 tests across `MultiStateDiscreteStateTests` and `MultiStateValueDiscreteStateTests` pass (13 passed, 0 failed). --------- Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>