对于集合MVC Dataannotation验证规则？ [英] MVC Dataannotation validation rule for a collection?

问题描述

是否有一个基于集合属性dataannotation验证规则？

Is there a dataannotation validate rule for a collection based property?

我有以下

  <DisplayName("Category")>
  <Range(1, Integer.MaxValue, ErrorMessage:="Please select a category")>
  Property CategoryId As Integer

  <DisplayName("Technical Services")>
  Property TechnicalServices As List(Of Integer)

我在寻找，我可以添加到TechnicalServices属性设置为集合尺寸最小的验证。

I'm looking for a validator that i can add to the TechnicalServices property to set a minimum for the collection size.

推荐答案

我觉得这样的事情可能会有所帮助：

I think something like this might help:

public class MinimumCollectionSizeAttribute : ValidationAttribute
{
    private int _minSize;
    public MinimumCollectionSizeAttribute(int minSize)
    {
        _minSize = minSize;
    }

    public override bool IsValid(object value)
    {
        if (value == null) return true;
        var list = value as ICollection;

        if (list == null) return true;

        return list.Count >= _minSize;
    }    
}

有改进的空间，但是这是一个工作的开始。

There's room for improvement, but that's a working start.

这篇关于对于集合MVC Dataannotation验证规则？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！