When 方法在扩展方法中。流利验证

发布于 2025-01-16 09:45:27 字数 638 浏览 1 评论 0原文

下面的代码中的 x 是 string? 类型，这是预期的，但是如果我将 Must 更改为 When 那么x 的类型为 T

public static IRuleBuilderOptions<T, string?> Example<T>(this IRuleBuilder<T, string?> rule, int maximumLength = 100)
        {
            return rule
                .Must(x => x?.Length > 0);
        }

我不明白为什么会发生这种情况。在简单的规则下，x 的类型是 string?，但在扩展方法中它变成 T，而行为相同的方法（I猜测）按预期工作

RuleFor(x => x.Line)
            .NotEmpty()
            .When(x => x.Line?.Length > 0);

原文

in the code below x is of type string? which is expected, but if I change Must to When then x is of type T

public static IRuleBuilderOptions<T, string?> Example<T>(this IRuleBuilder<T, string?> rule, int maximumLength = 100)
        {
            return rule
                .Must(x => x?.Length > 0);
        }

I can not figure why this is happening. On simple rules it works, x is of type string?, but in extension method it becomes T, while methods that behave the same(I guess) work as expected

RuleFor(x => x.Line)
            .NotEmpty()
            .When(x => x.Line?.Length > 0);

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最好是你 2025-01-23 09:45:27

发现应该这样做

public static IRuleBuilderOptions<T, string?> Example<T>(this IRuleBuilder<T, string?> rule, int maximumLength = 100, Func<T, string?> str)
        {
            return rule
                .When(x => str(x).Length > 0);
        }

Found that is should be done like this

public static IRuleBuilderOptions<T, string?> Example<T>(this IRuleBuilder<T, string?> rule, int maximumLength = 100, Func<T, string?> str)
        {
            return rule
                .When(x => str(x).Length > 0);
        }

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