AL0040 - Use attribute extensions

Replace direct AttributeData access with GetConstructorArgument/GetNamedArgument extensions

Source: AL0040UseAttributeExtensionsAnalyzer.cs

Description

Direct access to AttributeData.ConstructorArguments[i].Value is verbose and error-prone. ANcpLua.Roslyn.Utilities provides typed extraction extensions.

Bad Code

using Microsoft.CodeAnalysis;

// Verbose attribute argument access
var typeArg = (ITypeSymbol?)attr.ConstructorArguments[0].Value;
var name = attr.NamedArguments.FirstOrDefault(x => x.Key == "Name").Value.Value as string;

Good Code

using ANcpLua.Roslyn.Utilities;

// Type-safe extraction
var typeArg = attr.GetConstructorArgument<ITypeSymbol>(0);
var name = attr.GetNamedArgument<string>("Name");

Properties

• Category: Usage
• Severity: Warning
• Enabled by default: True
• Code fix available: False

Configuration

dotnet_diagnostic.AL0040.severity = warning

Notes

• GetConstructorArgument<T>(index) - type-safe positional argument extraction
• GetNamedArgument<T>(name) - type-safe named argument extraction
• Handles null and type conversion gracefully
• Common pattern in Roslyn analyzer development