Fluent Validation with Web Api 2

1. nuget添加FluentValidation.WebApi引用.

2. 模型定义：

    [Validator(typeof(CustomerValidator))]
    public class UserModel
    {
        public string UserName { get; set; }
        public string Password { get; set; }
    }

3. Validator定义:

    public class CustomerValidator : AbstractValidator<UserModel>
    {
        public CustomerValidator()
        {
            RuleFor(customer => customer.UserName).NotEmpty();
            RuleFor(customer => customer.Password).NotEmpty().WithMessage("Please specify a first name");
        }
    }

4. Controller定义:

    public class DefaultController : ApiController
    {
        // POST: api/Default
        public bool Post([FromBody]UserModel user)
        {
            //var validator = new CustomerValidator();
            //var results = validator.Validate(user);

            return user.UserName == "admin";
        }
    }

5. Validation Action Filter定义:

    public class ValidateModelStateFilter : ActionFilterAttribute
    {
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            if (!actionContext.ModelState.IsValid)
            {
                actionContext.Response = actionContext.Request.CreateErrorResponse(HttpStatusCode.BadRequest, actionContext.ModelState);
            }
        }
    }

6. 最后在WebApp启动时注册注册ValidationFilter：

    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API configuration and services

            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            config.Filters.Add(new ValidateModelStateFilter());
            FluentValidationModelValidatorProvider.Configure(config);
        }
    }

7. 测试：