我有一个简单的问题(或没有)。
为什么当我验证对象时,下面的代码每次都验证一个零件。
如果DataAnnotations失败,则不会调用来自IValidatableObject的Validate。
如果DataAnnotations正常,则从IValidatableObject调用Validate。
我的问题是:为什么?我认为没有任何理由。我想念什么吗?
这是我的类(class)(例如):
class Foo : IValidatableObject
{
[Required]
public DateTime Date { get; set; }
public virtual IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
var errors = new List<ValidationResult>();
if (Date.Ticks > DateTime.Today.Ticks)
{
errors.Add(new ValidationResult("Some error.", new[] { "Date" }));
}
return errors;
}
}
这是我的验证:
var dto = new Foo();
validationResults = new List<ValidationResult>();
var context = new ValidationContext(dto, null, null);
Validator.TryValidateObject(dto, context, validationResults, true);
// Force
//var model = dto as IValidatableObject;
//if (model != null)
//{
// validationResults.AddRange(model.Validate(context));
//}
最佳答案
解决方案:
private void ValidateIValidatableObject(IValidatableObject validatableObject, IList<ValidationResult> errors)
{
var validations = validatableObject.Validate(null).ToList();
validations.Where(vr => vr.MemberNames == null)
.ToList()
.ForEach(vr => errors.Add(new ValidationResult(vr.ErrorMessage)));
validations.Where(vr => vr.MemberNames != null)
.SelectMany(vr => vr.MemberNames.Select(mn => new { MemeberName = mn, vr.ErrorMessage }))
.ToList()
.ForEach(vr => errors.Add(new ValidationResult(vr.ErrorMessage, new string[] { vr.MemeberName })));
}
用法:
IList<ValidationResult> errors = new List<ValidationResult>();
ValidationContext context = new ValidationContext(model, null, null);
Validator.TryValidateObject(model, context, errors, true);
if (model is IValidatableObject validatableObject)
{
ValidateIValidatableObject(validatableObject, errors);
}
积分:https://github.com/aspnet/Mvc/issues/5366