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C# Academy · Lesson

FluentValidation Rules

Write expressive validators with fluent syntax.

Why FluentValidation?

FluentValidation is a popular .NET library that moves validation rules out of your models and into dedicated validator classes. Rules are expressed with a readable, chainable (fluent) API, keeping models clean and rules testable.

dotnet add package FluentValidation
dotnet add package FluentValidation.DependencyInjectionExtensions

The AbstractValidator Base Class

You write a validator by inheriting from AbstractValidator<T>, where T is the model you validate. Rules are defined in the constructor.

using FluentValidation;

public class CustomerValidator : AbstractValidator<Customer>
{
    public CustomerValidator()
    {
        // rules go here
    }
}

All lessons in this course

  1. Data Annotation Validation
  2. FluentValidation Rules
  3. Custom and Conditional Rules
  4. Integrating Validation with APIs
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