C# Feature - Generic attributes

Overview

Generic attributes let attribute types declare generic parameters so the compiler can enforce type-safe usage.

Introduced In

C# 11.0 (2022)

Before

[Validator(typeof(CustomerValidator))]
public class Customer { }

After

[Validator<CustomerValidator>]
public class Customer { }

Gotchas & Best Practices

• Attribute arguments still follow runtime metadata rules.
• Use this when a Type parameter existed only to carry a compile-time type choice.