Analyzers

Roslyn analyzers for modern C# patterns, OpenTelemetry, AOT safety, and ecosystem conventions.

ANcpLua.Analyzers enforces code quality and prevents common bugs. Included automatically with ANcpLua.NET.Sdk.

• 106 diagnostics spanning design, reliability, performance, OpenTelemetry, ASP.NET Core, AOT, and version management.
• 42 automatic code fixes for high-confidence transformations.
• CI-friendly enforcement through .editorconfig severity configuration.

Categories

Category	Rules	Examples
Roslyn Utilities	20	Guard helpers, symbol comparison, collection extensions
OpenTelemetry	23	Semantic conventions, ActivitySource, attribute validation, OTLP
AOT Testing	10	AotTest/TrimTest return codes, AotSafe/AotUnsafe, dynamic, reflection
ASP.NET Core	9	Form binding, resilience, health checks, service discovery
Usage	8	Span comparisons, IXmlSerializable, static lambdas, banned APIs
VersionManagement	6	Hardcoded versions, Version.props, diagnostics alignment
Threading	6	Lock patterns, async void, blocking calls in async
Configuration	5	ServiceDefaults, endpoints, EventSource, connection strings
Design	5	Primary constructors, type partialness, closed hierarchies
Metrics	5	Meter registration, naming, high cardinality, source generation
GenAI	4	Required attributes, operation names, token histograms
Style	3	Pattern matching, null-guard normalization
Reliability	2	Division by zero, await using

Rules

Id	Category	Description	Severity	Fix
AL0001	Design	Prohibit reassignment of primary constructor parameters	Error	-
AL0002	Design	Don’t repeat negated patterns	Warning	Yes
AL0003	Reliability	Don’t divide by constant zero	Error	-
AL0004	Usage	Use pattern matching for Span constants	Warning	Yes
AL0005	Usage	Use SequenceEqual for Span non-constants	Warning	Yes
AL0006	Design	Field name conflicts with primary constructor	Warning	-
AL0007	Usage	GetSchema should be explicitly implemented	Error	-
AL0008	Usage	GetSchema must return null	Error	Yes
AL0009	Usage	Don’t call IXmlSerializable.GetSchema	Error	-
AL0010	Design	Type should be partial	Disabled	Yes
AL0011	Threading	Avoid lock on non-Lock types	Warning	Yes
AL0012	OpenTelemetry	Deprecated semantic convention	Warning	Yes
AL0013	OpenTelemetry	Missing telemetry schema URL	Info	-
AL0014	Style	Prefer pattern matching for null/zero	Warning	Yes
AL0015	Style	Normalize null-guard style	Info	Yes
AL0016	Style	Combine declaration with null-check	Info	Yes
AL0017	VersionManagement	Hardcoded package version	Warning	-
AL0018	VersionManagement	Version.props not imported	Warning	-
AL0019	VersionManagement	Undefined version variable	Warning	-
AL0020	ASP.NET Core	IFormCollection requires explicit attribute	Error	-
AL0021	ASP.NET Core	Multiple structured form sources	Error	-
AL0022	ASP.NET Core	Mixed form collection and DTO	Error	-
AL0023	ASP.NET Core	Unsupported form type	Error	-
AL0024	ASP.NET Core	Form and body conflict	Error	-
AL0025	Usage	Anonymous function can be static	Warning	Yes
AL0026	Usage	Prefer TimeProvider over legacy date/time APIs	Warning	Yes
AL0027	Usage	Prefer System.Text.Json over Newtonsoft	Warning	Yes
AL0028	Roslyn Utilities	Use IsEqualTo() for symbol comparison	Info	Yes
AL0029	Roslyn Utilities	Use HasAttribute() for attribute checks	Info	Yes
AL0030	Roslyn Utilities	Use type hierarchy extensions	Info	Yes
AL0031	Roslyn Utilities	Use operation extensions	Info	Yes
AL0032	Roslyn Utilities	Use OrEmpty() extension	Info	Yes
AL0033	Roslyn Utilities	Use ToImmutableArrayOrEmpty() extension	Info	Yes
AL0034	Roslyn Utilities	Use WhereNotNull() extension	Info	Yes
AL0035	Roslyn Utilities	Use GetFullyQualifiedName/GetMetadataName()	Info	Yes
AL0036	Roslyn Utilities	Use Guard.NotNull()	Warning	Yes
AL0037	Roslyn Utilities	Use TryParse extensions	Warning	Yes
AL0038	Roslyn Utilities	Use GetOrNull/GetOrDefault extensions	Warning	Yes
AL0039	Roslyn Utilities	Use StringComparison extensions	Warning	Yes
AL0040	Roslyn Utilities	Use attribute argument extensions	Warning	Yes
AL0041	AOT Testing	[AotTest]/[TrimTest] must return int	Error	-
AL0042	AOT Testing	[AotTest]/[TrimTest] should return 100	Warning	-
AL0043	AOT Testing	[TrimSafe] violates trim safety	Warning	-
AL0044	AOT Testing	[AotSafe] violates AOT safety	Warning	-
AL0045	Roslyn Utilities	Use Guard.NotNullOrEmpty()	Warning	Yes
AL0046	Roslyn Utilities	Use Guard.NotNullOrWhiteSpace()	Warning	Yes
AL0047	Roslyn Utilities	Use Guard.NotZero()	Warning	Yes
AL0048	Roslyn Utilities	Use Guard.NotNegative()	Warning	Yes
AL0049	Roslyn Utilities	Use Guard.Positive()	Warning	Yes
AL0050	Roslyn Utilities	Use Guard.NotEmptyGuid()	Warning	Yes
AL0051	Roslyn Utilities	Use Guard.DefinedEnum()	Warning	Yes
AL0052	AOT Testing	[AotSafe] must not call [AotUnsafe]	Error	-
AL0053	AOT Testing	Unnecessary [AotUnsafe] attribute	Warning	-
AL0054	VersionManagement	Diagnostic missing from documentation	Warning	-
AL0055	VersionManagement	Diagnostic missing from release notes	Warning	-
AL0056	VersionManagement	Diagnostic documentation mismatch	Warning	-
AL0057	Threading	Avoid async void methods	Warning	-
AL0058	Threading	Avoid lock on this	Warning	-
AL0059	Threading	Avoid lock on typeof(T)	Warning	-
AL0060	Threading	Avoid lock on string	Warning	-
AL0061	OpenTelemetry	Activity missing semconv attributes	Warning	-
AL0062	OpenTelemetry	Deprecated semantic convention	Warning	-
AL0063	OpenTelemetry	Unregistered ActivitySource	Warning	-
AL0064	GenAI	GenAI span missing required attributes	Warning	-
AL0065	GenAI	Use token usage histogram	Warning	-
AL0066	GenAI	Invalid GenAI operation name	Warning	-
AL0067	Metrics	Unregistered Meter	Warning	-
AL0068	Metrics	Invalid metric name	Warning	-
AL0069	Configuration	Incomplete ServiceDefaults	Warning	-
AL0070	Configuration	Non-OTLP collector endpoint	Warning	-
AL0071	Metrics	Meter class must be partial static	Error	Yes
AL0072	Metrics	Metric method must be partial	Error	Yes
AL0073	OpenTelemetry	[Traced] requires non-empty ActivitySourceName	Error	Yes
AL0074	GenAI	Deprecated GenAI attribute	Warning	Yes
AL0075	Metrics	High-cardinality metric tag	Warning	-
AL0076	OpenTelemetry	Missing OTel configuration	Warning	-
AL0077	OpenTelemetry	Duplicate instrumentation	Warning	-
AL0078	OpenTelemetry	Invalid ActivitySource name	Error	-
AL0079	OpenTelemetry	Manual span recommended	Info	-
AL0080	ASP.NET Core	Missing resilience configuration	Warning	-
AL0081	ASP.NET Core	Missing health checks	Warning	-
AL0082	Configuration	Consider connection string configuration	Info	-
AL0083	Configuration	Insecure endpoint	Warning	-
AL0084	ASP.NET Core	Missing service discovery	Warning	-
AL0085	OpenTelemetry	Invalid attribute value	Error	-
AL0086	OpenTelemetry	Incorrect attribute type	Warning	-
AL0087	OpenTelemetry	Prefer constant attribute	Info	-
AL0088	OpenTelemetry	Sensitive data in attribute	Warning	-
AL0089	OpenTelemetry	Missing OTLP configuration	Warning	-
AL0090	OpenTelemetry	Uncompressed OTLP export	Warning	-
AL0091	OpenTelemetry	Batch export disabled	Warning	-
AL0092	OpenTelemetry	Consider sampling	Info	-
AL0093	OpenTelemetry	Missing resource attributes	Warning	-
AL0094	AOT Testing	Avoid dynamic keyword	Warning	-
AL0095	AOT Testing	Avoid Expression.Compile()	Warning	-
AL0096	Configuration	Enable EventSource support for AOT	Warning	-
AL0101	AOT Testing	Avoid Activator.CreateInstance	Warning	-
AL0102	AOT Testing	Avoid Type.GetType	Warning	-
AL0103	Design	Closed type hierarchy switch exhaustiveness	Warning	Yes
AL0104	Reliability	Prefer await using for IAsyncDisposable	Warning	-
AL0105	Threading	Avoid blocking calls in async methods	Warning	-
AL0106	ASP.NET Core	Avoid Task.Run in ASP.NET Core	Warning	-
AL0107	OpenTelemetry	Orphaned [TracedTag] attribute	Warning	Yes
AL0108	OpenTelemetry	Redundant [NoTrace] attribute	Info	Yes
AL0109	OpenTelemetry	Non-interceptable [Traced] method	Warning	Yes
AL0110	OpenTelemetry	[TracedTag] on out/ref parameter	Error	Yes

Legend: Error = build error, Warning = build warning, Info = IDE suggestion, Disabled = off by default.

Refactorings

Id	Description
AR0001	Snake case to Pascal case
AR0002	Make static lambda

Configuration

Configure via .editorconfig. See Configuration.

[*.cs]
dotnet_diagnostic.AL0014.severity = warning
dotnet_diagnostic.AL0010.severity = none