AL0036 - Use Guard.NotNull()

Replace null-coalescing throw patterns with Guard.NotNull() extension

Source: AL0036UseGuardNotNullAnalyzer.cs

Description

The pattern value ?? throw new ArgumentNullException(nameof(value)) is verbose. ANcpLua.Roslyn.Utilities provides Guard.NotNull() for cleaner null validation.

Bad Code

public class Service {
    private readonly ILogger _logger;

    public Service(ILogger logger) {
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }
}

Good Code

using ANcpLua.Roslyn.Utilities;

public class Service {
    private readonly ILogger _logger;

    public Service(ILogger logger) {
        _logger = Guard.NotNull(logger);
    }
}

Properties

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

Configuration

dotnet_diagnostic.AL0036.severity = warning

Notes

• Automatically uses CallerArgumentExpression for parameter name
• Throws ArgumentNullException with correct parameter name
• Reduces boilerplate in constructors and methods