我可以向一个对象添加多个验证器吗？例如:

public interface IFoo
{
    int Id { get; set; }
    string Name { get; set; }
}

public interface IBar
{
    string Stuff { get; set; }
}

public class FooValidator : AbstractValidator<IFoo>
{
    public FooValidator ()
    {
        RuleFor(x => x.Id).NotEmpty().GreaterThan(0);
    }
}

public class BarValidator : AbstractValidator<IBar>
{
    public BarValidator()
    {
        RuleFor(x => x.Stuff).Length(5, 30);
    }
}

public class FooBar : IFoo, IBar
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Stuff { get; set; }
}

public class FooBarValidator : AbstractValidator<FooBar>
{
    public FooBarValidator()
    {
        RuleFor(x => x)
            .SetValidator(new FooValidator())
            .SetValidator(new BarValidator());
    }
}

运行测试。

FooBarValidator validator = new FooBarValidator();
validator.ShouldHaveValidationErrorFor(x => x.Id, 0);

我得到一个InvalidOperationException:

Property name could not be automatically determined for expression x => x. Please specify either a custom property name by calling 'WithName'.

有没有什么方法可以实现这个，或者我是否正在尝试以一种不应该使用的方式使用 FluentValidation？

最佳答案

RuleFor 正在尝试创建属性级规则。您还可以使用 AddRule 函数添加通用规则。

使用它，我创建了一个复合规则概念证明。它接受一组其他验证器并运行它们。 yield break 代码直接来自 FluentValidator 的 DelegateValidator。我不确定如何处理它，所以我从源代码中获取了它。我没有追踪它的全部用途，但一切似乎都按原样工作:)

代码

public interface IFoo
{
    int Id { get; set; }
    string Name { get; set; }
}

public interface IBar
{
    string Stuff { get; set; }
}

public class FooValidator : AbstractValidator<IFoo>
{
    public FooValidator()
    {
        RuleFor(x => x.Id).NotEmpty().GreaterThan(0);
    }
}

public class BarValidator : AbstractValidator<IBar>
{
    public BarValidator()
    {
        RuleFor(x => x.Stuff).Length(5, 30);
    }
}

public class FooBar : IFoo, IBar
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Stuff { get; set; }
}

public class CompositeValidatorRule : IValidationRule
{
    private IValidator[] _validators;

    public CompositeValidatorRule(params IValidator[] validators)
    {
        _validators = validators;
    }

    #region IValidationRule Members
    public string RuleSet
    {
        get; set;
    }

    public IEnumerable<ServiceStack.FluentValidation.Results.ValidationFailure> Validate(ValidationContext context)
    {
        var ret = new List<ServiceStack.FluentValidation.Results.ValidationFailure>();

        foreach(var v in _validators)
        {
            ret.AddRange(v.Validate(context).Errors);
        }

        return ret;
    }

    public IEnumerable<ServiceStack.FluentValidation.Validators.IPropertyValidator> Validators
    {
        get { yield break; }
    }
    #endregion
}

public class FooBarValidator : AbstractValidator<FooBar>
{
    public FooBarValidator()
    {
        AddRule(new CompositeValidatorRule(new FooValidator(), new BarValidator()));
    }
}

基础测试用例:

    [TestMethod]
    public void TestValidator()
    {
        FooBarValidator validator = new FooBarValidator();
        var result = validator.Validate(new FooBar());

    }

希望对您有所帮助。

关于c# - FluentValidation 多个验证器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13198471/