What is Fluent Validation in ASP.NET Core?

What is Fluent Validation in ASP.NET Core?

Fluent Validation is a library for building strongly-typed validation rules for your ASP.NET Core applications. It allows you to define validation logic in a fluent interface, making it easy to read and maintain.

How do I install Fluent Validation in my ASP.NET Core project?

You can install Fluent Validation via NuGet. Run the command Install-Package FluentValidation.AspNetCore in the Package Manager Console.

Can you show me an example of how to use it?

Sure! First, create a model class, then create a validator class that inherits from AbstractValidator<T>. Define your rules in the constructor. For example:

public class User {
    public string Name { get; set; }
    public int Age { get; set; }
}

public class UserValidator : AbstractValidator<User> {
    public UserValidator() {
        RuleFor(user => user.Name).NotEmpty();
        RuleFor(user => user.Age).InclusiveBetween(18, 60);
    }
}