C# 如何使用lambda表达式进行验证，以验证一小时是否为某个时间；“类型”；（必须是hh:00或hh:30）

我必须创建一个具有StartDate、EndDate、userid等的事件。StartDate是Datetime，我必须进行此验证，事件的StartDate必须是hh:00或hh:30。 这就是我用于所有其他验证（up）的内容

试试这个：

RuleFor(m => m.StartDate)
    .NotEmpty().WithMessage(x => Validation.EventMessages.EmptyStartDate)
    .GreaterThanOrEqualTo(DateTime.UtcNow).WithMessage(x => Validation.EventMessages.StartDatePast).When(m => m.EndDate.HasValue)
    .LessThan(DateTime.UtcNow.AddMonths(1)).WithMessage(x => Validation.EventMessages.StartDateFuture).When(m => m.EndDate.HasValue)
    .LessThan(m => m.EndDate.Value).WithMessage(x => Validation.EventMessages.GreaterThan).When(m => m.EndDate.HasValue)
    .LessThan(m => DateTime.UtcNow.AddMinutes(15)).WithMessage(x => Validation.EventMessages.CancellationTimeSpanLess).When(m => m.EventStatus == (int)EventStatusEnum.cancelled)
    .Must(CanBook).WithMessage(x => Validation.EventMessages.Limit);

试试这个：

RuleFor(m => m.StartDate)
    .NotEmpty().WithMessage(x => Validation.EventMessages.EmptyStartDate)
    .GreaterThanOrEqualTo(DateTime.UtcNow).WithMessage(x => Validation.EventMessages.StartDatePast).When(m => m.EndDate.HasValue)
    .LessThan(DateTime.UtcNow.AddMonths(1)).WithMessage(x => Validation.EventMessages.StartDateFuture).When(m => m.EndDate.HasValue)
    .LessThan(m => m.EndDate.Value).WithMessage(x => Validation.EventMessages.GreaterThan).When(m => m.EndDate.HasValue)
    .LessThan(m => DateTime.UtcNow.AddMinutes(15)).WithMessage(x => Validation.EventMessages.CancellationTimeSpanLess).When(m => m.EventStatus == (int)EventStatusEnum.cancelled)
    .Must(CanBook).WithMessage(x => Validation.EventMessages.Limit);

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最后，我们改变了处理这一问题的方式，但这起了作用。我把x.minute改成了x.Value.minute。谢谢你的帮助最后我们改变了处理这件事的方式，但这起了作用。我把x.minute改成了x.Value.minute。谢谢你的帮助