具有多个条件的条件验证

Question

我熟悉 FluentValidation 中使用 When、Unless 和 Otherwise 的简单 conditional validation。这适用于在单一条件下进行验证。

我想根据 if-elseif-else 语句进行验证，但我无法确定如何进行验证。

我要实现

if (product == Product.A)
{
    // Validation for Product A
}
else if (product == Product.B)
{
    // Validation for Product B
}
else
{
    // Fail validation for other products
}

如果我只想检查单个产品，例如产品 A

When(
    order => order.Product == Product.A,
    () =>
    {
    RuleFor(order => order.State)
        .Must(
            state => state == State.HI
            || state == State.AK)
        .WithMessage("Product A only valid in Hawaii and Alaska.");
    }).Otherwise(
    () =>
    {
        RuleFor(order => order.Product)
            .Equal(Product.A)
            .WithMessage("Order only available with Product A.");
    });

我想要的是为产品 A 和 B 组合多个 When 方法，否则会失败并显示消息 "Order is only available with Products A or B"。

Answer 1

我已经通过拆分规则并设置守卫来解决类似的问题。

按照您的 if-else 伪代码：

RuleFor(order => order.State)
    .Must(state => state == State.HI || state == State.AK)
    .WithMessage("Product A only valid in Hawaii and Alaska."))
    .When(order => order.Product == Product.A);

RuleFor(order => order.State)
    .Must(state => state == State.DC || state == State.CA)
    .WithMessage("Product B only valid in Washington and California."))
    .When(order => order.Product == Product.B);

// the not Product.A or Product.B case (I'm not sure what you want here) - but this 
// demonstrates a kind of "meta" rule to be applied to the whole order
RuleFor(order => order)
    .Must(order => order.Product == Product.A || order.Product == Product.B)
    .WithName("Order")
    .WithMessage(order => $"Order must be either {Product.A} or {Product.B}");

具有多个条件的条件验证

Conditional Validation with Multiple Conditions

c#

fluentvalidation