验证List<T>以确保列表中包含一个带有数据注释的项目MVC C#

using System;
using System.Collections.Generic;
using System.Reflection;

public class MyClass
{
    public string Name { get; set; }

    [DataAnnotation("This is a data annotation")]
    public int Age { get; set; }
}

public class DataAnnotation : Attribute
{
    public string Description { get; private set; }

    public DataAnnotation(string description)
    {
        Description = description;
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        List<MyClass> myList = new List<MyClass>
        {
            new MyClass { Name = "John", Age = 25 },
            new MyClass { Name = "Jane", Age = 30 },
            new MyClass { Name = "Bob", Age = 35 }
        };

        bool containsDataAnnotation = false;

        foreach (var item in myList)
        {
            Type type = item.GetType();

            foreach (MemberInfo member in type.GetMembers())
            {
                foreach (Attribute attribute in member.GetCustomAttributes(true))
                {
                    if (attribute is DataAnnotation)
                    {
                        containsDataAnnotation = true;
                        break;
                    }
                }

                if (containsDataAnnotation)
                {
                    break;
                }
            }

            if (containsDataAnnotation)
            {
                break;
            }
        }

        if (containsDataAnnotation)
        {
            Console.WriteLine("List contains an item with data annotation");
        }
        else
        {
            Console.WriteLine("List does not contain any item with data annotation");
        }
    }
}