如何强制ValidationAttribute将指定的对象成员标记为无效

本文关键字：成员 对象 记为 无效 何强制 ValidationAttribute | 更新日期: 2023-09-27 18:03:02

我有我的模型，其中包含一些成员:

public class Address
{
   public Street { get; set;}
   public City { get; set; }
   public PostalCode { get; set; }
}

现在我已经重写了ValidationAttribute和IsValid方法，如下所示:

protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
    var input = value as Address;
    if (string.IsNullOrEmpty(input.City))
        return new ValidationResult("City is required);
    if (!string.IsNullOrEmpty(input.PostalCode))
        if (string.IsNullOrEmpty(input.Street))
            return new ValidationResult("Stret is required");
    return ValidationResult.Success;
}

问题是:

验证后，我的模型状态只将模型错误添加到整个address成员，但我需要将它添加到指定的成员，如city或street

对此有任何帮助将不胜感激…谢谢!

如何强制ValidationAttribute将指定的对象成员标记为无效

您可以添加memberNames !

return new ValidationResult("City is required", new string[] { "City", "Street" });
编辑:

我已经测试并找到了一个解决方案:System.ComponentModel.IDataErrorInfo !!这并不适用于javascript客户端，但当提交的结果是我们尝试:)所以继续使用ValidationResult和memberNames和:

public class myModel : System.ComponentModel.IDataErrorInfo
    {
        private Dictionary<string, List<ValidationResult>> errors;
        private bool IsValidated = false;
        private void Validate()
        {
            errors = new Dictionary<string, List<ValidationResult>>();
            List<ValidationResult> lst = new List<ValidationResult>();
            Validator.TryValidateObject(this, new ValidationContext(this, null, null), lst, true);
            lst.ForEach(vr =>
                {
                    foreach (var memberName in vr.MemberNames)
                        AddError(memberName, vr);
                });
            IsValidated = true;
        }
        private void AddError(string memberName, ValidationResult error)
        {
            if (!errors.ContainsKey(memberName))
                errors[memberName] = new List<ValidationResult>();
            errors[memberName].Add(error);
        }
        public string Error
        {
            get
            {
                if (!IsValidated)
                    Validate();
                return string.Join("'n", errors
                    .Where(kvp => kvp.Value.Any())
                    .Select(kvp => kvp.Key + " : " + string.Join(", ", kvp.Value.Select(err => err.ErrorMessage)))
                    );
            }
        }
        public string this[string columnName]
        {
            get
            {
                if (!IsValidated)
                    Validate();
                if (errors.ContainsKey(columnName))
                {
                    var value = errors[columnName];
                    return string.Join(", ", value.Select(err => err.ErrorMessage));
                }
                else
                    return null;
            }
        }

和当前属性标记错误，memberNames也是!

: D

编辑2

实际上，您可以保留简单的DataAnnotations来通知客户端，在服务器端，您可以添加更复杂的业务验证:

public class myModel : IValidatableObject
{
      public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
      {
            if (string.IsNullOrEmpty(input.City))
                  yield return new ValidationResult("City is required",new string[]{"prop1","prop2"});
            if (!string.IsNullOrEmpty(input.PostalCode))
                  if (string.IsNullOrEmpty(input.Street))
                        yield return new ValidationResult("Stret is required");
      }

请注意，只有当数据注释都有效时，Validate方法才会被调用!

需要使用ValidationResult类的这个构造函数。如

protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
    var input = value as Address;
    if (string.IsNullOrEmpty(input.City))
        return new ValidationResult("City is required", new List<string>(){"City"});
    if (!string.IsNullOrEmpty(input.PostalCode))
        if (string.IsNullOrEmpty(input.Street))
            return new ValidationResult("Stret is required", new List<string>(){"Street"});
    return ValidationResult.Success;
}
相关文章：