FluentValidation

Use FluentValidation with CommandDotNet to validate argument models.

TLDR, How to enable

.NET CLI

dotnet add package CommandDotNet.FluentValidation

Nuget Package Manager

Install-Package CommandDotNet.FluentValidation

Enable with appRunner.UseFluentValidation(), or appRunner.UseFluentValidation(showHelpOnError: true)
to print help when there are validation errors.

Example

class Program
{
    static int Main(string[] args)
    {
        return new AppRunner<ValidationApp>()
            .UseFluentValidation()
            .Run(args);
    }
}

public class ValidationApp
{
    public void ValidateModel(PersonModel person)
    {
        string content = JsonConvert.SerializeObject(person, Formatting.Indented);
        Console.WriteLine(content);
    }
}

[Validator(typeof(PersonValidator))]
public class PersonModel : IArgumentModel
{
    public int Id { get; set; }

    public string Name { get; set; }

    public string Email { get; set; }
}

public class PersonValidator : AbstractValidator<PersonModel>
{
    public PersonValidator()
    {
        RuleFor(x => x.Id).GreaterThan(0);
        RuleFor(x => x.Name).NotEmpty();
        RuleFor(x => x.Email).NotEmpty().EmailAddress();
    }
}

If the validation fails, app exits with return code 2 and outputs validation error messages to error output.