How to use FluentValidation.AspNetCore and FluentValidation.MVC6? - asp.net-core

Question

How to use FluentValidation.AspNetCore and FluentValidation.MVC6 to validate Entities in AspNetCore , can anyone give me an example ?

Answer 1

This is working for me:
project.json add:
"FluentValidation.AspNetCore": "6.4.0-beta3"
startup.cs
services
.AddMvc()
.AddFluentValidation(fv => fv.RegisterValidatorsFromAssemblyContaining<Startup>());
Validation:
public class Foo
{
public string Bar {get; set;}
}
public class FooValidator : AbstractValidator<Foo>
{
public FooValidator()
{
RuleFor(x => x.Bar).NotEmpty().WithMessage("Error Message");
}
}

Answer 2

first you need to add nuget Install-Package FluentValidation.AspNetCore
you can have an action filter which will handle validation:
public class ValidatorActionFilter : IActionFilter
{
public void OnActionExecuting(ActionExecutingContext filterContext)
{
if (!filterContext.ModelState.IsValid)
{
filterContext.Result = new BadRequestObjectResult(filterContext.ModelState);
}
}
public void OnActionExecuted(ActionExecutedContext filterContext)
{
}
}
Startup.ConfigureServices looks like this to add auto validation and add FluentValidation:
services.AddMvc(opt =>
{
opt.Filters.Add(typeof(ValidatorActionFilter));
}).AddFluentValidation(fvc =>
fvc.RegisterValidatorsFromAssemblyContaining<Startup>())
If you need to read another assembly, name one of its classes instead of startUp
Now you can add a validation to ensure:
public class CreateCustomer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
}
public class CreateCustomerValidator : AbstractValidator<CreateCustomer>
{
public CreateCustomerValidator()
{
RuleFor(x => x.FirstName).NotNull().WithMessage(Resource.Validaton.FirstNameRequired);
RuleFor(x => x.LastName).NotNull().WithMessage(Resource.Validaton.LastNameRequired);
RuleFor(x => x.Email).Matches(#"\A(?:[a-z0-9!#$%&'*=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*=?^_`{|}~-]+)*#(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\Z").WithMessage(Resource.Validaton.EmailFormat);
}
}