[英]C# Unable to validate property using a custom validate attribute
I have a validation class: 我有一个验证类:
public sealed class ValidationSet : ValidationAttribute
{
private List<string> _set = new List<string>();
public ValidationSet(params string[] setOfValues)
{
_set = setOfValues.ToList();
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
if (!(_set.Select(s => s.ToLower()).Contains(value.ToString().ToLower())))
{
throw new Exception("not in the set");
}
return ValidationResult.Success;
}
}
and here is how I use it: 这是我的用法:
public class Car
{
[ValidationSet("honda", "gm")]
public string CarMake{ get; set; }
}
When I instantiate the Car class by: 当我通过以下方式实例化Car类时:
...
Car c = new Car();
c.CarMake = "ford";
...
Nothing will happen and if I print c.CarMake, it shows ford - the validation didn't happened. 什么都不会发生,如果我打印c.CarMake,则显示为福特-验证未发生。
I am just wondering what do I miss here. 我只是想知道我在这里想念什么。
Thanks! 谢谢!
Just instantiating the class and assigning the field is not going to call IsValid, you need to use the class in a framework that examines Car, sees that it has ValidationAttribute on CarMake and will call IsValid. 只需实例化该类并分配该字段就不会调用IsValid,您需要在检查Car,看到CarMake上具有ValidationAttribute并调用IsValid的框架中使用该类。
In this example asp:DynamicValidator is doing the work: 在此示例中,asp:DynamicValidator正在执行工作:
I would look into FluentValidation. 我将研究FluentValidation。 You can create a validator class for Car.
您可以为Car创建一个验证器类。
public class CarValidator : AbstractValidator<Car>
{
public CarValidator() {
RuleFor(m => m.CarMake).Equal("gm").Equal("honda");
}
}
Usage: 用法:
var car = new Car { CarMake = "honda" };
var validator = new CarValidator();
if (validator.Validate(car).IsValid)
// car is valid
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