好用的验证框架FluentValidation(上)

好用的验证框架FluentValidation(上)

 

 

 

  把数据错误扼杀在早期,那就是在数据的入口处,一般数据都是打包成一个实体的方式进传递,FluentValidation就以实体类为单位进行属性验证的集合。

Install-Package FluentValidation

下面看一个例子吧。

实体类:

public class Person
{
    public int Id { get; set; }
    public DateTime Birthday { get; set; }
    public string IDCard { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public PersonAddress Address { get; set; }
    public string Tel { get; set; }
}
public class PersonAddress
{
    public string Country { get; set; }
    public string Province { get; set; }
    public string City { get; set; }
    public string County { get; set; }
    public string Address { get; set; }
    public string Postcode { get; set; }
}

验证实体类:

/// <summary>
/// Person验证
/// </summary>
public class PersonValidator : AbstractValidator<Person>
{
    public PersonValidator()
    {
        RuleFor(p => p.Name).NotNull();
        RuleFor(p => p.Email).NotNull().EmailAddress();
        RuleFor(p => p.Birthday).NotNull();
        RuleFor(p => p.IDCard)
            .NotNull()
            .When(p => (DateTime.Now > p.Birthday.AddYears(1)))
            .WithMessage(p => $"出生日期为{p.Birthday},现在时间为{DateTime.Now},大于一岁,CardID值必填!");
        RuleFor(p => p.Tel).NotNull().Matches(@"^(\d{3,4}-)?\d{6,8}$|^[1]+[3,4,5,8]+\d{9}$");
        RuleFor(p => p.Address).NotNull();
        RuleFor(p => p.Address).SetValidator(new PersonAddressValidator());
    }
}
/// <summary>
/// Person Address验证
/// </summary>
public class PersonAddressValidator : AbstractValidator<PersonAddress>
{
    public PersonAddressValidator()
    {
        RuleFor(a => a.Country).NotNull();
        RuleFor(a => a.Province).NotNull();
        RuleFor(a => a.City).NotNull();
        RuleFor(a => a.County).NotNull();
        RuleFor(a => a.Address).NotNull();
        RuleFor(a => a.Postcode).NotNull().Length(6);
    }
}

使用场景:

class Program
{
    static void Main(string[] args)
    {
        var person = new Person()
        {
            //少一位
            Tel = "1345346711",
            Name = "桂素伟",
            //格式错误
            Email = "axzxs2001#163.com",
            //设置生日,没有身份证
            Birthday = DateTime.Parse("2020-03-28 00:00:00"),

            Address = new PersonAddress()
            {
                //邮编位数不对
                Postcode = "12345"
            },
        };
        var validator = new PersonValidator();
        var results = validator.Validate(person);
        if (!results.IsValid)
        {
            foreach (var failure in results.Errors)
            {
                Console.WriteLine("属性 " + failure.PropertyName + " 验证失败:" + failure.ErrorMessage);
            }
        }
        Console.WriteLine("--------------------------------------------------------------------");
        Console.WriteLine(results.ToString("\r\n"));
    }
}

  FluentValidation有一个很赞的功能,就是验证某一属性时,可以用别的属性的值作为条件,组合实现验证,这样就能适应更多的业务逻辑验证场景。比如上例中的,只有大于一岁(Birthday)的人,身份证(IDCard)是必填项。当然FluentValidation不只这些功能,比如嵌套实体验证,组合验证规则等,都是很贴心的功能,期待大家尝试。

 

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