DIBasedTestAttribute.cs

Go to the documentation of this file.

//-----------------------------------------------------------------------
// <copyright file="DIBasedTestAttribute.cs" company="Marimer LLC">
//     Copyright (c) Marimer LLC. All rights reserved.
//     Website: https://cslanet.com
// </copyright>
// <summary>Data Annotations attribute that makes use of DI</summary>
//-----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace Csla.Test.ValidationRules
{
 
  internal class DIBasedTestAttribute : ValidationAttribute
  {
    public DIBasedTestAttribute() : base("Unknown validation error") { }
 
    public override bool RequiresValidationContext => true;
 
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
      ApplicationContext applicationContext;
 
      if (value is null) return ValidationResult.Success;
      if (validationContext is null) throw new ArgumentNullException(nameof(validationContext));
 
      applicationContext = (ApplicationContext)validationContext.GetService(typeof(ApplicationContext));
 
      if (applicationContext is null)
      {
        return new ValidationResult("Service provider failed to create the appropriate class!");
      }
 
      return ValidationResult.Success;
    }
  }
}