CustomValidationAttribute specifed方法不会被调用 [英] CustomValidationAttribute specifed method not being called

问题描述

我使用的是System.ComponentModel.DataAnnotations.CustomValidationAttribute来验证我的POCO类之一，当我试图单元测试，它甚至没有调用验证方法。

I'm using the System.ComponentModel.DataAnnotations.CustomValidationAttribute to validate one of my POCO classes and when I try to unit test it, it's not even calling the validation method.

public class Foo
{
  [Required]
  public string SomethingRequired { get; set }
  [CustomValidation(typeof(Foo), "ValidateBar")]
  public int? Bar { get; set; }
  public string Fark { get; set; }

  public static ValidationResult ValidateBar(int? v, ValidationContext context) {
    var foo = context.ObjectInstance as Foo;
    if(!v.HasValue && String.IsNullOrWhiteSpace(foo.Fark)) {
      return new ValidationResult("Either Bar or Fark must have something in them.");
    }
    return ValidationResult.Success;
  }
}

但是当我尝试对其进行验证：

but when I try to validate it:

var foo = new Foo { 
  SomethingRequired = "okay"
};
var validationContext = new ValidationContext(foo, null, null);
var validationResults = new List<ValidationResult>();
bool isvalid = Validator.TryValidateObject(foo, validationContext, validationResults);
Assert.IsFalse(isvalid); //FAIL!!! It's valid when it shouldn't be!

它甚至从来没有步入自定义验证方法。是什么给了？

It never even steps into the custom validation method. What gives?

推荐答案

尝试使用，需要一个布尔值，指定如果所有属性都应该被验证过载。对最后一个参数传递true。

Try using the overload that takes a bool that specifies if all properties should be validated. Pass true for the last parameter.

public static bool TryValidateObject(
    Object instance,
    ValidationContext validationContext,
    ICollection<ValidationResult> validationResults,
    bool validateAllProperties
)

如果你传递虚假或省略validateAllProperties，只有将RequiredAttribute标签进行检查。
这里是 MSDN文档。

If you pass false or omit the validateAllProperties, only the RequiredAttribute will be checked. Here is the MSDN documentation.

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