如何在 ASP.NET Core 中实现自定义模型验证?

问题描述

在以前版本的 ASP.NET MVC 中，向模型添加自定义验证的方法是实现 IValidatableObject 并实现自己的 Validate() 方法.举个例子:

In previous versions of ASP.NET MVC the way to add custom validation to your model was by implementing the IValidatableObject and implementing your own Validate() method. As an example:

public class BestModelEver : IValidatableObject {
    public DateTime? Birthday { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) {
        if (Birthday.HasValue) {
            yield return new ValidationResult("Error message goes here");
        }
    }
}

这仍然是向 ASP.NET Core 中的模型添加自定义验证的推荐方法吗?使用 IValidatableObject 会产生 System.ComponentModel.DataAnnotations 依赖.

Is this still the recommended way of adding custom validation to a model in ASP.NET Core? Using IValidatableObject takes on a System.ComponentModel.DataAnnotations dependency.

推荐答案

在 ASP.NET Core 中进行自定义模型验证有两种方法:

There are two ways to do custom model validation in ASP.NET Core:

• 从 ValidationAttribute 子类化的自定义属性.当您想将自定义业务逻辑应用到具有属性的特定模型property 时，这很有用.
• 实施 IValidatableObject 以进行类级验证.当您需要一次对整个模型进行验证时，请使用此选项.

• A custom attribute subclassed from ValidationAttribute. This is useful when you want to apply custom business logic to a particular model property with an attribute.
• Implementing IValidatableObject for class-level validation. Use this instead when you need to do validation on an entire model at once.

文档 两者都有例子.在您的情况下，IValidatableObject 可能是最好的方法.

The documentation has examples of both. In your case, IValidatableObject would probably be the best approach.

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