检查重复项的通用C#函数(不同的对象，不同的字段)

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

public static class DuplicateChecker
{
    public static bool ContainsDuplicate<T>(IEnumerable<T> items, params string[] fieldNames)
    {
        if (items == null || !fieldNames.Any())
            return false;

        var seen = new HashSet<string>();

        foreach (var item in items)
        {
            var key = GenerateKey(item, fieldNames);
            if (!seen.Add(key))
                return true; // 发现重复项
        }

        return false; // 没有发现重复项
    }

    private static string GenerateKey<T>(T item, string[] fieldNames)
    {
        var keyParts = new List<string>();

        foreach (var fieldName in fieldNames)
        {
            var propertyInfo = typeof(T).GetProperty(fieldName);
            if (propertyInfo == null)
                throw new ArgumentException($"No property named '{fieldName}' on type '{typeof(T).Name}'");

            var value = propertyInfo.GetValue(item)?.ToString();
            keyParts.Add(value ?? string.Empty);
        }

        return string.Join("|", keyParts);
    }
}

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }
}

var people = new List<Person>
{
    new Person { FirstName = "John", LastName = "Doe", Age = 30 },
    new Person { FirstName = "Jane", LastName = "Doe", Age = 28 },
    new Person { FirstName = "John", LastName = "Doe", Age = 30 } // 重复项
};

bool hasDuplicate = DuplicateChecker.ContainsDuplicate(people, "FirstName", "LastName");
Console.WriteLine(hasDuplicate); // 输出: True