使用 Fluent Validation 与枚举进行大于或等于比较？
好吧，假设我正在尝试根据枚举的值有条件地验证对象，我该怎么做？
这是验证对象的示例调用。
MyObjectValidator validator = new MyObjectValidator();
ValidationResult results = validator.Validate(new MyObject());
这是具有枚举值的类的示例。
public class MyObjectValidator : AbstractValidator<MyObject>
{
public MyObjectValidator()
{
RuleFor(x => x.anEnum).Equal(MyObject.MyEnum.First).SetValidator(new FirstValidator());
}
}
public class FirstValidator : AbstractValidator<MyObject>
{
public FirstValidator()
{
RuleFor(x => x.someDecimal).Equal(1).WithMessage("Decimal must equal 5 with anEnum set to First");
}
}
public class MyObject
{
public enum MyEnum : int
{
First = 0,
Second = 1,
Third = 2
}
public decimal someDecimal { get; set; }
public MyEnum anEnum { get; set; }
public MyObject()
{
anEnum = MyEnum.First;
someDecimal = 5;
}
}
这个特定的示例抛出消息：“验证器‘FirstValidator’无法验证类型‘MyEnum’的成员 - 类型不兼容。”
经过一些编辑后，我想出了一个包装器来完成我所希望的事情，但我更喜欢一个更优雅的解决方案。我将 MyObjectValidator 替换为
public MyObjectValidator()
{
RuleFor(x => x.anEnum).SetValidator(new ValidatorWrapper<MyObject>()).When(x => x.anEnum == MyObject.MyEnum.First);
}
并添加了验证器包装器
public class ValidatorWrapper<T> : PropertyValidator
{
public ValidatorWrapper() : base("Validator Message")
{
}
protected override bool IsValid(PropertyValidatorContext context)
{
MyObject myObj = (MyObject)context.Instance;
FirstValidator validator = new FirstValidator();
ValidationResult results = validator.Validate(myObj);
}
}
有没有一种方法可以引用内部上下文而无需提供 propertyvalidator 包装器，以便我可以根据枚举值有条件地验证多个规则？
Ok, let's say I'm trying to validate an object conditionally based upon the value of an enum, how can I do that?
Here's a sample call to validate the object.
MyObjectValidator validator = new MyObjectValidator();
ValidationResult results = validator.Validate(new MyObject());
Here's a sample of a class with an Enum Value.
public class MyObjectValidator : AbstractValidator<MyObject>
{
public MyObjectValidator()
{
RuleFor(x => x.anEnum).Equal(MyObject.MyEnum.First).SetValidator(new FirstValidator());
}
}
public class FirstValidator : AbstractValidator<MyObject>
{
public FirstValidator()
{
RuleFor(x => x.someDecimal).Equal(1).WithMessage("Decimal must equal 5 with anEnum set to First");
}
}
public class MyObject
{
public enum MyEnum : int
{
First = 0,
Second = 1,
Third = 2
}
public decimal someDecimal { get; set; }
public MyEnum anEnum { get; set; }
public MyObject()
{
anEnum = MyEnum.First;
someDecimal = 5;
}
}
This particular example throws the message: "The validator 'FirstValidator' cannot validate members of type 'MyEnum' - the types are not compatible."
After some editing, I came up with a wrapper to do what I'm hoping, but I'd prefer a more elegant solution. I replaced MyObjectValidator with
public MyObjectValidator()
{
RuleFor(x => x.anEnum).SetValidator(new ValidatorWrapper<MyObject>()).When(x => x.anEnum == MyObject.MyEnum.First);
}
And added a validator wrapper
public class ValidatorWrapper<T> : PropertyValidator
{
public ValidatorWrapper() : base("Validator Message")
{
}
protected override bool IsValid(PropertyValidatorContext context)
{
MyObject myObj = (MyObject)context.Instance;
FirstValidator validator = new FirstValidator();
ValidationResult results = validator.Validate(myObj);
}
}
Is there a way to reference the inner context without having to provide the propertyvalidator wrapper such that I can conditionally validate a number of rules based upon an enum value?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
您看到的错误（“验证器 'FirstValidator' 无法验证类型 'MyEnum' 的成员 - 类型不兼容”）是因为通过使用 SetValidator，您尝试验证 anEnum 属性使用 FirstValidator （只能验证 MyObject 的实例） - 这不是正确的方法。如果要根据枚举属性触发规则，则需要使用FluentValidation对条件的支持。
如果您只有一个要应用条件的规则，那么您可以执行以下操作：
...或者，如果您想将相同的条件应用于多个规则，您可以使用顶部的单个条件-level When 方法：
The error you're seeing ("The validator 'FirstValidator' cannot validate members of type 'MyEnum' - the types are not compatible") is because by using SetValidator you're trying to validate the anEnum property with FirstValidator (which can only validate instances of MyObject) - this isn't the correct approach. If you want to trigger rules based on the enum property, you need to use FluentValidation's support for conditions.
If you've only got a single rule to which you want to apply the condition, then you can do this:
...alternatively, if you want to apply the same condition to multiple rules, you can use a single condition using the top-level When method:
您正在使用 CLR 的
Object.Equals()，您需要使用Equal()或库提供的任何其他方法。You're using the CLR's
Object.Equals(), you need to useEqual()or whatever else the library provides.