我有以下视图模型定义
public class AccessRequestViewModel
{
public Request Request { get; private set; }
public SelectList Buildings { get; private set; }
public List<Person> Persons { get; private set; }
}
因此，在我的应用程序中，必须至少有一个人请求访问权限.您可以使用什么方法来验证？我不希望这种验证发生在我的控制器上，这很简单.唯一的 Select 是自定义验证属性吗？
Edit:当前正在使用FluentValidation(尼斯库！)执行此验证
RuleFor(vm => vm.Persons)
.Must((vm, person) => person.Count > 0)
.WithMessage("At least one person is required");
如果使用数据批注执行验证，则可能需要自定义属性:
public class EnsureOneElementAttribute : ValidationAttribute
{
public override bool IsValid(object value)
{
var list = value as IList;
if (list != null)
{
return list.Count > 0;
}
return false;
}
}
然后:
[EnsureOneElement(ErrorMessage = "At least a person is required")]
public List<Person> Persons { get; private set; }
或者让它更通用:
public class EnsureMinimumElementsAttribute : ValidationAttribute
{
private readonly int _minElements;
public EnsureMinimumElementsAttribute(int minElements)
{
_minElements = minElements;
}
public override bool IsValid(object value)
{
var list = value as IList;
if (list != null)
{
return list.Count >= _minElements;
}
return false;
}
}
然后:
[EnsureMinimumElements(1, ErrorMessage = "At least a person is required")]
public List<Person> Persons { get; private set; }
就我个人而言，我使用FluentValidation.NET而不是数据批注来执行验证，因为我更喜欢命令式验证逻辑而不是声明性验证逻辑.我觉得它的威力更大.因此，我的验证规则将简单地如下所示:
RuleFor(x => x.Persons)
.Must(x => x.Count > 0)
.WithMessage("At least a person is required");