规则链的一条消息?

One Message for rule chain?

我在使用 FluentValidation 时遇到问题,无论给定链中的验证错误如何,我都想显示一条消息。例如,我在下面为 属性 定义了一个验证链。我希望对链进行评估,任何失败都会导致下面的 WithMessage() 调用中定义的消息。但是,它似乎短路了,只显示遇到的第一个错误的 FluentValidation 默认错误消息。请参阅下面的代码:

RuleFor(s => s.ProposalDetail.AgeMin).NotNull()
        .GreaterThanOrEqualTo(1)
        .LessThanOrEqualTo(99)
        .WithMessage("Minimum Age entry is required and must range from 1 to 99 years.");

实际情况是 AgeMin 属性 为空,因此第一个 NotNull() 检查失败,验证消息为“'Proposal Detail. Age Min' 不得为空”。 Proposal Detail 是封装视图模型的名称。 我已经尝试将整个验证器的 CascadeMode 设置为 CascadeMode.Continue,但没有效果。

我怎样才能完成一条消息一条 属性 验证链?

更新 4
我找到了一个更简单的解决方案,它适用于使用 Configure 方法的任何版本,因此不再需要我原来的“扩展方法”方法

using FluentValidation;
using FluentValidation.Results;
using System;
using System.Linq;

namespace ConsoleApplication9
{
    class Program
    {
        static void Main(string[] args)
        {

            Customer customer = new Customer() { };
            CustomerValidator validator = new CustomerValidator();
            ValidationResult results = validator.Validate(customer);
            Console.WriteLine(results.Errors.First().ErrorMessage);
            Console.ReadLine();
        }
    }
    public class CustomerValidator : AbstractValidator<Customer>
    {

        public CustomerValidator()
        {
            RuleFor(s => s.Id).NotNull()
                .GreaterThanOrEqualTo(1)
                .LessThanOrEqualTo(99)
                .Configure(rule => rule.MessageBuilder = _ => "Minimum Age entry is required and must range from 1 to 99 years.");

        }

    }

    public class Customer { public int? Id { get; set; } }
}

原回答:版本9之前都可以,但是比上面的复杂
你可以用一个简单的扩展方法来完成你想要的

using FluentValidation;
using FluentValidation.Internal;
using FluentValidation.Resources;
using FluentValidation.Results;
using System;
using System.Linq;

namespace ConsoleApplication9
{
    class Program
    {
        static void Main(string[] args)
        {

            Customer customer = new Customer() { };
            CustomerValidator validator = new CustomerValidator();
            ValidationResult results = validator.Validate(customer);
            Console.WriteLine(results.Errors.First().ErrorMessage);
            Console.ReadLine();
        }
    }
    public class CustomerValidator : AbstractValidator<Customer>
    {
        public CustomerValidator()
        {

            RuleFor(s => s.Id).NotNull()
                          .GreaterThanOrEqualTo(1)
                          .LessThanOrEqualTo(99)
                          .WithGlobalMessage("Minimum Age entry is required and must range from 1 to 99 years.");
        }

    }

    public class Customer { public int? Id { get; set; } }

    public static class MyExtentions
    {
        public static IRuleBuilderOptions<T, TProperty> WithGlobalMessage<T, TProperty>(this IRuleBuilderOptions<T, TProperty> rule, string errorMessage)
        {
            foreach (var item in (rule as RuleBuilder<T, TProperty>).Rule.Validators)
                item.Options.ErrorMessageSource=new StaticStringSource(errorMessage);
        
            return rule;
        }
    }
}

以下适用于任何版本,但由于它使用 Must 方法,它不是很干净,您会怀念流畅界面的感觉。

using FluentValidation;
using FluentValidation.Results;
using System;
using System.Linq;

namespace ConsoleApplication9
{
    class Program
    {
        static void Main(string[] args)
        {
            Customer customer = new Customer() { };
            CustomerValidator validator = new CustomerValidator();
            ValidationResult results = validator.Validate(customer);
            Console.WriteLine(results.Errors.First().ErrorMessage);
            Console.ReadLine();
        }
    }
    public class CustomerValidator : AbstractValidator<Customer>
    {
        public CustomerValidator()
        {
            RuleFor(x => x)
                .Must(x => x.Id != null && x.Id >= 1 && x.Id <= 99)
                .WithMessage("Minimum Age entry is required and must range from 1 to 99 years.");
        }
    }
    public class Customer { public int? Id { get; set; } }
}

更新 3:(2019 年 4 月 7 日) 在 FluentValidation v8.2.2 中,IRuleBuilderOptions 接口不再直接访问 IRuleBuilderOptions.ErrorMessageSource 属性,我们应该使用:IRuleBuilderOptions.Options.ErrorMessageSource .

最直接的解决方案是将消息设置为变量,并在每个规则后应用相同的消息:

var message = "Minimum Age entry is required and must range from 1 to 99 years.";
RuleFor(s => s.ProposalDetail.AgeMin)
    .NotNull()
        .WithMessage(message)
    .GreaterThanOrEqualTo(1)
        .WithMessage(message)
     .LessThanOrEqualTo(99)
        .WithMessage(message);

替换 ErrorMessageSource 的过时 属性 赋值,并使用波纹管替代 FluentValidation 版本 >= 9.x

    public static class ValidatorExtensions
    {
        public static IRuleBuilderOptions<T, TProperty> WithGlobalMessage<T, TProperty>(this IRuleBuilderOptions<T, TProperty> rule, string errorMessage)
        {
            var rules = rule as RuleBuilder<T, TProperty>;
            foreach (var item in rules.Rule.Validators)
            {
                item.Options.SetErrorMessage(errorMessage);
            }

            return rule;
        }
    }