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使用Fluent Validation比较数组中的值

fluentvalidation c#

1

SpaceCowboy74 Mohammad Aghazadeh · 技术社区 · 2 月前

我在HTTP Post正文中收到了一个对象数组。看起来像这样:

{
  load: {
     stops: [
          { 
            Name: "Stop 1",
            AppointmentDateTime: "02/25/2025T14:00:00"
          },
          { 
            Name: "Stop 2",
            AppointmentDateTime: "02/25/2025T13:00:00"
          },
          { 
            Name: "Stop 3",
            AppointmentDateTime: "02/25/2025T15:30:00"
          }
      ]
   }
}

我已经用C#编写了一个流体验证器,可以使用以下代码:

RuleForEach(x => x.Stops).ChildRule(stop => 
{
   stop.RuleFor(s => s.Name).NotEmpty().NotNull();
   stop.RuleFor(s => s.AppointmentDateTime).NotEmpty().NotNull().Must(x => x > x.DateTime.Now).WithMessage("AppointmentDateTime must be in the future");
}

虽然这可行,但我想验证数组中的项是否是连续的。第2站应在第1站之后有预约时间,第3站在第2站之后等。我在代码中找不到一种方法来做类似for循环的事情,这样我就可以保存前一个项目的值。理想情况下,我会做这样的事情:

Stop? prevStop = null;
foreach (stop in stops) {
  if (!prevStop is null)
    {
     DO SOMETHING TO validate that prevStop.AppointmentDateTime > stop.AppointmentDateTime;
    }
  prevStop = stop;
}

虽然有一种类似foreach的测试项目的方法,但我看不出有什么方法可以保存上一个项目以与当前项目进行比较。

1 回复 | 直到 2 月前

1

SpaceCowboy74 Mohammad Aghazadeh 2 月前

您可以创建 Custom Validator 如下:


public class LoadValidator : AbstractValidator<Load>
{
    public LoadValidator()
    {
        RuleForEach(x => x.Stops).ChildRule(stop =>
        {
            stop.RuleFor(s => s.Name).NotEmpty().NotNull();
            stop.RuleFor(s => s.AppointmentDateTime).NotEmpty().NotNull().Must(x => x > DateTime.Now).WithMessage("AppointmentDateTime must be in the future");
        });

        RuleFor(x => x.Stops).Must(stops => BeInChronologicalOrder(stops)).WithMessage("Stops must be in chronological order");
    }

    private bool BeInChronologicalOrder(Stop[] stops)
    {
        if (stops == null || stops.Length <= 1)
        {
            return true;
        }

   
        //iterate through the array
        //and compare the AppointmentDateTime of the current stop 
        //with the AppointmentDateTime of the previous stop.
        //If any stop's appointment time
        //is not after the previous stop's appointment time, the   validation fails,
        //and the method returns false.
       
        for (int i = 1; i < stops.Length; i++)
        {
            if (stops[i].AppointmentDateTime <= stops[i - 1].AppointmentDateTime)
            {
                return false;
            }
        }

        return true;
    }
}