c# - .Net Fluent Validation 集执行顺序

Question

我需要设置验证的执行顺序，以便在第一次失败后停止验证。

但是 this is not available ，所以我想知道还有什么其他方法可以做到这一点。

通常我会有这样的东西:

public Constructor(){

    // Simple validation
    RuleFor(x => x.Id).NotNull().NotEmpty();

    // advanced validation
    // item must exist in database
    RuleFor(x => x.Id).Must(ExistsInDatabase);

    // item must exist in database previously
    // item must be some of the allowed names -- fetched from db
    RuleFor(x => x.Id).Must(BeAReferenceInSomeTable);

    private bool ExistsInDatabase(){}

    private bool BeAReferenceInSomeTable(){}

}

但是有了这个 BeAReferenceInSomeTable 可以在 ExistsInDatabase 之前执行。因此 BeAReferenceInSomeTable 验证将在 Id 不存在于表中时抛出异常，而不是由于 ExistsInDatabase 验证而导致验证失败。

首先要解决这个问题，首先想到的是这样的:

public Constructor(){

    CascadeMode = FluentValidation.CascadeMode.StopOnFirstFailure;

    // simple validation stays the same
    ...

    // advanced validation
    RuleFor(x => x.Id)
        .Must(ExistsInDatabase)
        .Must(BeAReferenceInSomeTable)
        .When(x => !string.IsNullOrEmpty(x.Id) &&
                    !string.IsNullOrEmpty(x.Name)
        );  
}

但是在这种情况下，由于必须在执行之前给出消息，因此我如何设置正确的消息进行验证。

Answer 1

试试这样的:

public Constructor(){

    // Simple validation
    RuleFor(x => x.Id).Cascade(CascadeMode.StopOnFirstFailure).NotNull().WithMessage("Must not be null");

    RuleFor(x => x.Id).NotEmpty().WithMessage("Must not be empty");


    // advanced validation
    // item must exist in database
    RuleFor(x => x.Id).Must(ExistsInDatabase).WithMessage("Must exist in database");

    // item must exist in database previously
    // item must be some of the allowed names -- fetched from db
    RuleFor(x => x.Id).Must(BeAReferenceInSomeTable).WithMessage("Must not be referenced");

    private bool ExistsInDatabase(){}

    private bool BeAReferenceInSomeTable(){}

}

并为执行顺序链接:

RuleFor(x => x.Id).Cascade(CascadeMode.StopOnFirstFailure)
    .NotNull().WithMessage("Must not be null")
    .NotEmpty().WithMessage("Must not be empty")
    .Must(ExistsInDatabase).WithMessage("Must exist in database")
    .Must(BeAReferenceInSomeTable).WithMessage("Must not be referenced");