[英]Custom validation attribute is never validated
我正在尝试创建一个自定义验证属性,以仅要求一个字段,具体取决于另一个字段的结果。
我遇到的问题是,从未调用过IsValid块。 数据似乎正在进入领域,我已经能够使用断点进行检查。
我尝试将TryValidateModel(this)
放在OnPostAsync
并且可以通过断点,但是我可以看到发生了另一个错误。
请求的操作对DynamicMethod无效
这是下面的代码。 任何帮助,将不胜感激。
public class PageOneModel : PageModel
{
[BindProperty]
public bool CompanyHouseToggle { get; set; }
[BindProperty]
[StringLength(60, MinimumLength = 3)]
[RequiredIf("CompanyHouseToggle", desiredvalue: "true")]
public string CompanyNumber { get; set; }
[BindProperty]
[StringLength(60, MinimumLength = 3)]
public string OrganisationName { get; set; }
[BindProperty]
[RegularExpression(pattern: "(GB)?([0-9]{9}([0-9]{3})?|[A-Z]{2}[0-9]{3})", ErrorMessage = "This VAT number is not recognised")]
public string VatNumber { get; set; }
public void OnGet()
{
}
public async Task<IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return Page();
}
RedirectToPage("2");
}
}
public class RequiredIfAttribute : System.ComponentModel.DataAnnotations.ValidationAttribute
{
private String PropertyName { get; set; }
private Object DesiredValue { get; set; }
public RequiredIfAttribute(String propertyName, Object desiredvalue)
{
this.PropertyName = propertyName;
this.DesiredValue = desiredvalue;
}
protected override ValidationResult IsValid(object value, ValidationContext context)
{
var property = context.ObjectType.GetProperty(PropertyName);
if (property == null)
throw new ArgumentException("Property with this name not found");
// Just for testing purposes.
return new ValidationResult(ErrorMessage);
}
}
我建议您从ReuiredAttribute继承。 它完全适合我。
public class RequiredUnlessDeletingAttribute : RequiredAttribute
{
string DeletingProperty;
/// <summary>
/// Check if the object is going to be deleted skip the validation.
/// </summary>
/// <param name="deletingProperty">The boolean property`s name which shows the object will be deleted.</param>
public RequiredUnlessDeletingAttribute(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);
}
}
在此处检查完整的实施
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