[英]ASP.NET Core MVC model validation in viewmodel with base model
[英]Skip all the validation of a model base on one of its property (ASP.Net Core 2.0)
我如何可以跳过基于其属性之一的模型的所有验证。 例如,如果对象的WillBeDeleted
属性为 true,验证器将跳过所有验证规则。
namespace ViewModel
{
public class ContactForm : IViewModel
{
[ValidateNever]
public Contact Item { get; set; }
public Category Category { get; set; }
[Required, DisplayName("First name")]
[StringLength(200, ErrorMessage = "First name should not exceed 200 characters.")]
public string FirstName { get; set; }
[Required, DisplayName("Last name")]
[StringLength(200, ErrorMessage = "Last name should not exceed 200 characters.")]
public string LastName { get; set; }
public List<TelephonesSubForm> Telephones { get; set; } = new List<TelephonesSubForm>();
public List<EmailsSubForm> Emails { get; set; } = new List<EmailsSubForm>();
public class TelephonesSubForm : IViewModel
{
public int Id { get; set; }
public bool MustBeDeleted { get; set; }
[Required]
public TelephoneAndEmailType Type { get; set; }
[Required]
[StringLength(200, MinimumLength = 10, ErrorMessage = "Telephone should not exceed 200 characters.")]
public string Telephone { get; set; }
}
public class EmailsSubForm
{
public int Id { get; set; }
public bool MustBeDeleted { get; set; }
[Required]
public TelephoneAndEmailType Type { get; set; }
[Required]
[StringLength(200, MinimumLength = 10, ErrorMessage = "Email should not exceed 200 characters.")]
public string Email { get; set; }
}
}
}
在给定的示例模型中,当MustBeDeleted
为true
,表示将在保存操作中删除电子邮件或电话项。
我搜索并发现了几个关于条件(自定义)验证的问题,他们建议在检查ModelState
的验证状态之前从ModelState
删除特定的键。 像这个。
我正在添加一个新答案并保留旧答案,因为它可能对某人有用
因此,创建一个自定义属性:
public class CustomShouldValidateAttribute : Attribute, IPropertyValidationFilter
{
public CustomShouldValidateAttribute(){
}
public bool ShouldValidateEntry(ValidationEntry entry, ValidationEntry parentEntry)
{
//Here you change this verification to Wether it should verificate or not, In this case we are checking if the property is ReadOnly (Only a get method)
return !entry.Metadata.IsReadOnly;
}
}
和他们在你的班级上你用你的自定义属性装饰它
[CustomShouldValidateAttribute]
public class MyClass{
public string Stuff{get;set;}
public string Name {get{return "Furlano";}}
}
尽管这不是问题的完整答案,但可以继承验证属性( RequiredAttribute
、 StringLength
等)并覆盖IsValid
方法。 作为示例,我提供其中之一。
public class RequiredWhenItIsNotDeletingAttribute : RequiredAttribute
{
string DeletingProperty;
/// <summary>
/// Check if the object is going to be deleted skip the validation.
/// </summary>
/// <param name="deletingProperty">The boolean property which shows the object will be deleted.</param>
public RequiredWhenItIsNotDeletingAttribute(string deletingProperty = "MustBeDeleted") =>
DeletingProperty = deletingProperty;
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var property = validationContext.ObjectType.GetProperty(DeletingProperty);
if((bool)property.GetValue(validationContext.ObjectInstance))
return ValidationResult.Success;
return base.IsValid(value, validationContext);
}
}
从 IValidatableObject 继承您的模型
并实现接口方法:
public virtual IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
if (YourCondition==false){
yield return new ValidationResult(
$"This is wrong",
new[] { nameof(Email) });
}
else
yield return ValidationResult.Success
}
但是您必须为您的每个属性实现验证并排除您已经编写的装饰!
您可以调用该方法:
ModelState.Clear()
当 MustBeDeleted 为真时
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