PostSharp/Metalama.Extensions.Architecturev2026.1.2-preview

About

The Metalama.Extensions.Architecture package allows you to validate your source code against architecture rules both in real time, straight in the IDE, or at compile time.

Features

• Simple API: choose between custom attributes or a fluent API.
• Warnings appear as familiar C# warnings.
• Immediate feedback as you type in the IDE.
• Warnings can be suppressed using the standard mechanisms such as #pragma warning disable.
• Validate code references and dependencies.
• Validate naming conventions.
• Validate child/derived classes.
• Works across projects.
• Fully extensible using Metalama.Extensions.Validation, Metalama.Framework and Roslyn.
• Commercially supported.

License

This package is a commercial extension of the open-source Metalama.Framework and requires a Metalama Professional license.

Principal Types

There are two ways to use this package:

1. By adding to your code one of the following architecture custom attributes from the Metalama.Extensions.Architecture.Aspects namespace:

   • [CannotBeUsedFrom]
   • [CanOnlyBeUsedFrom]
   • [InternalsCannotBeUsedFrom]
   • [InternalsCanOnlyBeUsedFrom]
   • [Experimental]
   • [InternalImplementOnly]
   • [DerivedTypesMustRespectNamingConvention]
   • [DerivedTypesMustRespectRegexNamingConvention]

2. By using fabrics, using the extension methods in the ArchitectureExtensions types

Example

The following snippet reports warnings whenever an internal type or member of the current namespace is used from a different namespace.

    namespace SomeNamespace;

    using Metalama.Extensions.Architecture.Fabrics;
    using Metalama.Framework.Fabrics;

    public class Fabric : NamespaceFabric
    {
        public override void AmendNamespace( INamespaceAmender amender )
        {
            amender.Verify().InternalsCanOnlyBeUsedFrom( UsageRule.OwnNamespace );
        }
    }