动态消息流利的验证 [英] Fluent validation with dynamic message

问题描述

我试图构建自定义验证用流利的验证库的动态消息。

I am trying to building custom validation with dynamic message in fluent validation library.

例如：

public class CreateProcessValidator : AbstractValidator<CreateProcessVM>
{
    public CreateProcessValidator()
    {
        RuleFor(x => x.ProcessFile).Must((x,e) => IsProcessFileValid(x.ProcessFile))).WithMessage("Parse failed with error : {0}");        
    }

    public bool IsProcessFileValid(HttpPostedFileBase file)
    {
        var errorMessage = "..."  // pass result to validaton message ?
        // logic
        return false;
    }
}

是这里的任何解决办法如何通过验证的结果？

Is here any workaround how to pass validation result ?

感谢

推荐答案

你有没有尝试过这样的事情？

Have you tried something like this?

public class IsProcessFileValid : PropertyValidator
{
    public IsProcessFileValid(): base("{ValidationMessage}") {}

    protected override IsValid(PropertyValidatorContext context)
    {
        if (!IsProcessFileValid1(context))
            context.MessageFormatter.AppendArgument("ValidationMessage",
                "Custom validation message #1");

        if (!IsProcessFileValid2(context))
            context.MessageFormatter.AppendArgument("ValidationMessage",
                "Custom validation message #2");

        // ...etc

        return true;
    }

    private bool IsProcessFileValid1(PropertyValidatorContext context)
    {
        // logic
        return false;
    }

    private bool IsProcessFileValid2(PropertyValidatorContext context)
    {
        // logic
        return false;
    }

    // ...etc
}

通过扩展方法：

public static class IsProcessFileValidExtensions
{
    public static IRuleBuilderOptions<T, object> MustBeValidProcessFile<T>
        (this IRuleBuilder<T, object> ruleBuilder)
    {
        return ruleBuilder.SetValidator(new IsProcessFileValid());
    }

}

...然后使用没有自定义的 WithMessage ：

public CreateProcessValidator()
{
    RuleFor(x => x.ProcessFile).MustBeValidProcessFile();        
}

通过创建一个自定义的 PropertyValidator ，您可以在类中封装默认的验证消息，并使其充满活力。但是声明，当你不能使用 .WithMessage 延长 RuleFor ，因为这将覆盖默认验证消息，你直接在定制 PropertyValidator 。

By creating a custom PropertyValidator, you can encapsulate the default validation message within that class and make it dynamic. However you must not use the .WithMessage extension when declaring the RuleFor, because that would override the default validation message which you customized directly inside the PropertyValidator.

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