csharp 自定义需要可能与dict一起使用的验证器。

Posted 2021-05-12

using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http.Filters;
using System.Web.Http.Controllers;
using System.ComponentModel.DataAnnotations;

namespace Dovetail.Novaerus.Argus.WebUI.Infrastructure.Validation
{
    // http://stackoverflow.com/questions/14836248/passing-custom-parameters-to-validationattribute
    public class RequireDictItemAttribute : RequiredAttribute
    {
        string[] _args;

        public RequireDictItemAttribute(params string[] args)
        {
            _args = args;
        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            if (_args.Contains((string)value))
                return ValidationResult.Success;

            
            var id = validationContext.ObjectInstance.GetType()
                        .GetProperty("Id")
                        .GetValue(validationContext.ObjectInstance, null);
            var key = new[]
            {
                id.ToString()
            };
            return new ValidationResult("Invalid value.", key);
        }
    }
}