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feat: structural refactoring and validation support (v3.6.0)
10-task batch refactoring improving strictness, readability, and extensibility: - HttpVerb enum replacing string-based HTTP method comparisons - Generic CombineAll replacing hand-written CombineSix/CombineNine (163→47 lines) - EmitContext record struct flattening nested pipeline tuples - MapCallEmitter extracting shared map call helpers - Per-concern middleware emission methods - Pure CollectSerializableTypes extraction - Exhaustive switch expressions with ArgumentOutOfRangeException - `in` parameter optimization for readonly record structs - ValidationResolverEmitter for DataAnnotations integration - Validation showcase sample project 457 tests passing, 0 warnings, 0 errors. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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‎.editorconfig‎

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@@ -15,6 +15,22 @@ dotnet_diagnostic.AL0025.severity = warning # Prefer static lambda
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dotnet_diagnostic.AL0026.severity = warning # DateTime.Now/UtcNow
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dotnet_diagnostic.AL0027.severity = warning # Newtonsoft.Json
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# CA1062: Validate arguments of public methods — Roslyn callbacks guarantee non-null
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dotnet_diagnostic.CA1062.severity = none
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# CA1308: Normalize strings to uppercase — lowercase is standard for URL routes
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dotnet_diagnostic.CA1308.severity = none
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# Meziantou — suppress opinionated style rules
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dotnet_diagnostic.MA0002.severity = none # StringBuilder — generator code uses IndentedTextWriter
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dotnet_diagnostic.MA0006.severity = none # string.Equals — string == is ordinal, explicit enough
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dotnet_diagnostic.MA0008.severity = none # StructLayoutAttribute — unnecessary for managed types
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dotnet_diagnostic.MA0011.severity = none # IFormatProvider on TryParse — netstandard2.0 is fine
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dotnet_diagnostic.MA0048.severity = none # File name must match type — partial classes + DTOs are intentional
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dotnet_diagnostic.MA0049.severity = none # Type name ≠ namespace — ErrorOr in ErrorOrX is by design
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dotnet_diagnostic.MA0004.severity = none # ConfigureAwait — ASP.NET Core has no SynchronizationContext
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dotnet_diagnostic.MA0016.severity = none # Collection abstraction — contradicts CA1859 (use concrete types)
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dotnet_diagnostic.MA0051.severity = none # Method too long — source generators have legitimate long methods
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# ============================================================================
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# IDE Suggestion-Level Rules Rationale
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# ============================================================================
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# Test code intentionally uses patterns that trigger warnings in production code.
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# These are suppressed for test files only.
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[**/tests/**/*.cs]
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# Nullable suppression (null!) is intentional for testing null argument validation
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[tests/**/*.cs]
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resharper_nullable_warning_suppression_is_used_highlighting = none
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# Record properties in test data structures may not be directly accessed
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resharper_not_accessed_positional_property_local_highlighting = none
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# Multiple enumeration is sometimes acceptable in tests for clarity
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resharper_possible_multiple_enumeration_highlighting = none
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# Pure method return values may be intentionally discarded in tests
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resharper_return_value_of_pure_method_is_not_used_highlighting = none
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# Redundant nullable suppressions after assertions
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resharper_redundant_nullable_warning_suppression_highlighting = none
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[**/src/**/*.cs]
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# CA1859 requires concrete types for performance; Rider's suggestion to widen conflicts
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# CA1859 requires concrete types for private methods; ReSharper suggests the opposite
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resharper_parameter_type_can_be_enumerable_local_highlighting = none
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resharper_suggest_base_type_for_parameter_highlighting = none
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# ============================================================================
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# Generator-Specific Suppressions
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# The namespace intentionally does not match the folder structure.
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[**/ErrorOrX.Generators/Polyfills.cs]
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dotnet_diagnostic.IDE0130.severity = none
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dotnet_diagnostic.CA1019.severity = none # Polyfill attribute constructor — intentional design
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dotnet_diagnostic.CA1305.severity = none # uint.ToString() — no locale dependence
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dotnet_diagnostic.CA1812.severity = none # IsExternalInit — compiler-reserved type
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# Extractor.cs: AL0029 flags foreach-over-GetAttributes() loops, suggesting
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# HasAttribute() instead. These loops legitimately need to extract constructor

‎CHANGELOG.md‎

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## [Unreleased]
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## [3.6.0] - 2026-02-13
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### Added
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- **HttpVerb enum**: Replaced string-based HTTP method comparisons throughout the core generator pipeline with a
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strongly-typed `HttpVerb` enum, providing compile-time exhaustiveness checks and eliminating string comparison bugs.
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- **EmitContext record struct**: Flattened deeply nested Roslyn pipeline tuples into a named `EmitContext` record struct,
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improving readability of `RegisterSourceOutput` callbacks.
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- **MapCallEmitter**: Extracted shared map call emission helpers (`EmitMapCallStart`/`EmitMapCallEnd`) used by both
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grouped and ungrouped endpoint emission, eliminating code duplication.
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- **ValidationResolverEmitter**: New emitter for validation resolver support with DataAnnotations integration.
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- **Validation showcase sample**: Added `ErrorOrX.Validation.Showcase` sample project demonstrating validation patterns.
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### Changed
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- **Generic CombineAll**: Replaced hand-written `CombineSix`/`CombineNine` provider combiners with a generic
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`CombineAll<T>(params IncrementalValuesProvider<T>[])` using pairwise loop (163 lines → 47 lines).
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- **Per-concern middleware emission**: Split monolithic `EmitMiddlewareCalls` into 4 focused per-concern methods
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(`EmitAuthorizationMiddleware`, `EmitRateLimitingMiddleware`, `EmitOutputCacheMiddleware`, `EmitCorsMiddleware`).
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- **Pure `CollectSerializableTypes`**: Extracted serializable type collection as a pure method from the analyzer.
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- **Exhaustive switch expressions**: Added `ArgumentOutOfRangeException` discard arms to all `ParameterSource` and
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`HttpVerb` switch expressions for compile-time safety.
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- **`in` parameter optimization**: Added `in` modifier to 5 `MiddlewareInfo` and `VersioningInfo` readonly record struct
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parameters to avoid unnecessary copies.
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- **Updated dependencies**: ANcpLua.Roslyn.Utilities 1.31.0 → 1.33.0.
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## [3.5.0] - 2026-02-08
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### Changed
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- **Emitter cohesion refactoring**: Improved expressiveness and removed incoherent patterns in
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`ErrorOrEndpointGenerator.Emitter.cs`:
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- Removed passthrough wrappers (`EmitParameterBinding`, `BuildArgumentExpression`) that added indirection without
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logic — callers now use `BindingCodeEmitter` directly
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- Unified `WrapReturn` — eliminated duplicate local function in `EmitUnionTypeErrorHandling` by threading
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`InvokerContext` through `EmitValidationHandling` and `EmitErrorTypeSwitch`, also removing `Func<string, string>`
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delegate allocations
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- Collapsed `GetSuccessFactoryWithLocation` from 4 sequential guard clauses into a single positive condition
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- Simplified `HasValidatableTypes` from manual nested loop to `Any()`/`Any()` LINQ expression
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- Simplified `SortEndpoints` from manual array copy + `Array.Sort` to idiomatic `OrderBy`/`ThenBy` chain
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- **Nullable suppression fix**: Replaced `constant.Value.ToString()!` in `ErrorOrContext.TypedConstantToLiteral` with
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`Convert.ToString(constant.Value, CultureInfo.InvariantCulture) ?? "null"` — removes hidden nullable assumption and
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uses `InvariantCulture` consistently with adjacent numeric arms.
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## [3.4.0] - 2026-02-07
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### Changed

‎CLAUDE.md‎

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**Search for existing implementations first.** Common duplication areas:
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| Concept | Symbol-based API | String-based API |
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|------------------|----------------------------------------------|----------------------------------------------|
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| Unwrap nullable | `ErrorOrContext.UnwrapNullable(ITypeSymbol)` | `TypeNameHelper.UnwrapNullable(string)` |
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| Type comparison | Roslyn `ITypeSymbol.Equals` | `TypeNameHelper.TypeNamesMatch()` |
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| Route parameters | - | `RouteValidator.BuildRouteParameterLookup()` |
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| Concept | Owner | Do NOT duplicate in |
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|--------------------|----------------------------------------------|----------------------------------------------|
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| Unwrap nullable | `ErrorOrContext.UnwrapNullable(ITypeSymbol)` | `TypeNameHelper.UnwrapNullable(string)` |
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| Type comparison | Roslyn `ITypeSymbol.Equals` | `TypeNameHelper.TypeNamesMatch()` |
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| Route parameters | - | `RouteValidator.BuildRouteParameterLookup()` |
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| Param binding emit | `BindingCodeEmitter` | Emitter.cs (call directly, no wrappers) |
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| Wrap return exprs | `InvokerContext.WrapReturn()` | Local functions in emit methods |

‎Directory.Build.props‎

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<Import Project="$(MSBuildThisFileDirectory)version.props"/>
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<PropertyGroup>
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<ANcpLuaRoslynUtilitiesVersion>1.31.0</ANcpLuaRoslynUtilitiesVersion>
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</PropertyGroup>
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<PropertyGroup>
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<LangVersion>preview</LangVersion>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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<Deterministic>true</Deterministic>
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<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
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<AnalysisLevel>latest-all</AnalysisLevel>
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<EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
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<Authors>ANcpLua</Authors>
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<Copyright>Copyright (c) 2025 Alexander Nachtmann</Copyright>
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<PackageLicenseExpression>MIT</PackageLicenseExpression>

‎Directory.Build.targets‎

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<PackageReference Include="Roslynator.Analyzers" PrivateAssets="all"/>
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<PackageReference Include="Roslynator.Formatting.Analyzers" PrivateAssets="all"/>
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<PackageReference Include="Roslynator.CodeAnalysis.Analyzers" PrivateAssets="all"/>
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<PackageReference Include="Meziantou.Analyzer" PrivateAssets="all"/>
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<PackageReference Include="JonSkeet.RoslynAnalyzers" PrivateAssets="all" Condition="'@(PackageReference->WithMetadataValue('Identity', 'JonSkeet.RoslynAnalyzers'))' == ''"/>
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</ItemGroup>
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<ItemGroup>
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<!-- Ensure PackageVersion is defined for CPM -->
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<PackageVersion Update="ANcpLua.Analyzers" Version="1.13.0"/>
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<PackageVersion Include="ANcpLua.Analyzers" Version="1.13.0" Condition="'@(PackageVersion->WithMetadataValue('Identity', 'ANcpLua.Analyzers'))' == ''"/>
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<PackageVersion Include="Meziantou.Analyzer" Version="$(MeziantouAnalyzerVersion)"/>
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<!-- JonSkeet: SDK adds it for some projects, so use Update + conditional Include -->
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<PackageVersion Update="JonSkeet.RoslynAnalyzers" Version="1.0.0-beta.6"/>
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<PackageVersion Include="JonSkeet.RoslynAnalyzers" Version="1.0.0-beta.6" Condition="'@(PackageVersion->WithMetadataValue('Identity', 'JonSkeet.RoslynAnalyzers'))' == ''"/>

‎Directory.Packages.props‎

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<PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0"/>
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<PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0"/>
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<PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0"/>
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<PackageVersion Include="ANcpLua.Roslyn.Utilities" Version="1.31.0"/>
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<PackageVersion Include="ANcpLua.Roslyn.Utilities.Testing" Version="1.31.0"/>
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<PackageVersion Include="ANcpLua.Roslyn.Utilities" Version="$(ANcpLuaRoslynUtilitiesVersion)"/>
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<PackageVersion Include="ANcpLua.Roslyn.Utilities.Testing" Version="$(ANcpLuaRoslynUtilitiesVersion)"/>
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<PackageVersion Update="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.4"/>
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<PackageVersion Update="Microsoft.Sbom.Targets" Version="4.1.5"/>
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<PackageVersion Include="ErrorProne.NET.CoreAnalyzers" Version="0.8.2-beta.1"/>
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<PackageVersion Include="xunit.v3.mtp-v2" Version="3.2.2"/>
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<PackageVersion Include="AwesomeAssertions" Version="9.3.0"/>
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<PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.3"/>
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<PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="10.0.2"/>
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<PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.2"/>
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<PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="$(MicrosoftAspNetCoreTestHostVersion)"/>
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<PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="$(MicrosoftAspNetCoreMvcTestingVersion)"/>
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<PackageVersion Include="Asp.Versioning.Http" Version="8.1.1"/>
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</ItemGroup>
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‎ErrorOrX.slnx‎

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<Folder Name="/samples/">
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<Project Path="samples/DiagnosticsDemos/DiagnosticsDemos.csproj"/>
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<Project Path="samples/ErrorOrX.Sample/ErrorOrX.Sample.csproj"/>
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<Project Path="samples/ErrorOrX.Validation.Showcase.Models/ErrorOrX.Validation.Showcase.Models.csproj"/>
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<Project Path="samples/ErrorOrX.Validation.Showcase/ErrorOrX.Validation.Showcase.csproj"/>
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<!-- Tests -->

‎nuget.config‎

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<?xml version="1.0" encoding="utf-8"?>
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<configuration>
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<packageSources>
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<clear/>
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<add key="nuget.org" value="https://api.nuget.org/v3/index.json"/>
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<clear />
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<add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
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<package pattern="*" />
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‎samples/Directory.Build.props‎

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<Project>
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<!-- Import root build settings -->
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<Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" Condition="'$(DirectoryBuildPropsImported)' != 'true'"/>
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<PropertyGroup>
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<DirectoryBuildPropsImported>true</DirectoryBuildPropsImported>
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</PropertyGroup>
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<!-- Sample/demo code doesn't need production-level analysis -->
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<PropertyGroup>
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<AnalysisLevel>none</AnalysisLevel>
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</PropertyGroup>
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</Project>

‎samples/ErrorOrX.Validation.Showcase.Models/CreateOrderRequest.cs‎

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using System.ComponentModel.DataAnnotations;
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namespace ErrorOrX.Validation.Showcase.Models;
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public sealed record CreateOrderRequest(
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[Required] [StringLength(200, MinimumLength = 1)]
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string CustomerName,
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[Required] [EmailAddress] string Email,
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[Required] [MinLength(1)] IReadOnlyList<OrderItem> Items);
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public sealed record OrderItem(
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[Required] [StringLength(100)] string ProductName,
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[Range(1, 10000)] int Quantity,
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[Range(0.01, 999999.99)] decimal UnitPrice);
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public sealed record UpdateOrderRequest(
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[StringLength(200)] string? CustomerName,
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[EmailAddress] string? Email);
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public sealed record Order(
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Guid Id,
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string CustomerName,
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string Email,
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IReadOnlyList<OrderItem> Items,
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decimal TotalAmount,
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DateTimeOffset CreatedAt);

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