数组必须包含1元 [英] Array must contain 1 element

问题描述

我有以下类：

public class CreateJob
{
    [Required]
    public int JobTypeId { get; set; }
    public string RequestedBy { get; set; }
    public JobTask[] TaskDescriptions { get; set; }
}

我想有上述 TaskDescriptions 数据标注，这样的阵列必须至少包含一个元素？就像 [必需] 。这可能吗？

I'd like to have a data annotation above TaskDescriptions so that the array must contain at least one element? Much like [Required]. Is this possible?

推荐答案

我见过之前用于此自定义验证属​​性，如：

I've seen a custom validation attribute used for this before, like this:

（我已经给定的样本与列表，但可以适用于数组或者你可以使用列表）

(I've given sample with a list but could be adapted for array or you could use list)

public class MustHaveOneElementAttribute : ValidationAttribute
{
    public override bool IsValid(object value)
    {
        var list = value as IList;
        if (list != null)
        {
            return list.Count > 0;
        }
        return false;
    }
}
[MustHaveOneElementAttribute (ErrorMessage = "At least a task is required")]
public List<Person> TaskDescriptions { get; private set; }

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