如何在.NET内核中实现自定义模型验证器

using System;
using System.ComponentModel.DataAnnotations;

public class CustomValidatorAttribute : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        // 自定义验证逻辑
        if (value != null && value.ToString().Contains("example"))
        {
            return ValidationResult.Success;
        }
        else
        {
            return new ValidationResult("属性值不符合要求");
        }
    }
}

public class MyModel
{
    [CustomValidator]
    public string CustomProperty { get; set; }
}

public class Program
{
    public static void Main(string[] args)
    {
        var model = new MyModel { CustomProperty = "example" };

        var validationContext = new ValidationContext(model, null, null);
        var validationResults = new System.Collections.Generic.List<ValidationResult>();

        bool isValid = Validator.TryValidateObject(model, validationContext, validationResults, true);

        if (isValid)
        {
            Console.WriteLine("模型验证通过");
        }
        else
        {
            foreach (var validationResult in validationResults)
            {
                Console.WriteLine(validationResult.ErrorMessage);
            }
        }
    }
}