Alternatives to FluentValidation

FluentValidation is a popular .NET library for building strongly-typed validation rules in a fluent way, providing a clean and easily readable syntax. It allows developers to define validation logic within their models using a fluent interface, improving code maintainability and readability. While FluentValidation is highly customizable and extensible, it has some limitations such as lack of built-in support for asynchronous validation and limited integration with some ORMs.

1. DataAnnotations: DataAnnotations is a built-in .NET library that provides attributes for declarative validation of model properties. It is lightweight and easy to use, but lacks the flexibility and advanced validation features of FluentValidation.
2. ValidationRules: ValidationRules is a simple and lightweight validation library for .NET. It allows defining validation rules using lambda expressions and provides a fluent API for configuring validation logic. However, it may not be as feature-rich as FluentValidation.
3. FluentValidation.AspNetCore: FluentValidation.AspNetCore is an extension for FluentValidation that integrates seamlessly with ASP.NET Core applications. It simplifies the process of validating request models in web applications, but may have a learning curve for beginners.
4. Validator: Validator is a flexible and extensible validation library for .NET. It supports both synchronous and asynchronous validation, custom validation rules, and integration with popular frameworks like Entity Framework. Its feature set may be comparable to FluentValidation.
5. NValid: NValid is a lightweight and easy-to-use validation library for .NET applications. It offers a fluent API for defining constraints and rules, but may lack some advanced features found in FluentValidation.
6. FluentAssertions: FluentAssertions is primarily a library for writing fluent unit tests in .NET, but it also provides some validation capabilities for verifying object properties and behaviors. It can be used for simple validation scenarios, but may not be as robust as FluentValidation.
7. DryIoc: DryIoc is a fast and lightweight dependency injection container for .NET applications. While it is not a dedicated validation library, it allows for defining validation rules and strategies for dependency resolution, making it a versatile alternative to FluentValidation.
8. ValidationContext: ValidationContext is a validation library for .NET that aims to simplify the process of defining and applying validation rules to objects. It provides a fluent syntax for configuring validation logic and supports integration with various data sources and formats.
9. Carcinetix.Validation: Carcinetix.Validation is a validation library for .NET Core applications that offers a clean and easy-to-use API for defining validation rules. It supports both synchronous and asynchronous validation, custom validators, and integration with popular frameworks.
10. SharpRaven.Validation: SharpRaven.Validation is a validation library for .NET that aims to simplify the process of defining and applying validation rules. It provides a fluent syntax for configuring validation logic and supports advanced features such as batch validation and conditional rule execution.