如何在C#中无重复地导出列表头？

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

public class ExampleClass
{
    public int Id { get; set; }
    public string Name { get; set; }
    public DateTime Date { get; set; }
}

public class Program
{
    public static void Main()
    {
        List<ExampleClass> exampleList = new List<ExampleClass>
        {
            new ExampleClass(),
            new ExampleClass(),
            // 添加更多对象...
        };

        HashSet<string> headers = GetUniqueHeaders(exampleList);

        foreach (string header in headers)
        {
            Console.WriteLine(header);
        }
    }

    private static HashSet<string> GetUniqueHeaders<T>(IEnumerable<T> list)
    {
        HashSet<string> headers = new HashSet<string>();

        if (list != null && list.Any())
        {
            Type itemType = typeof(T);
            var properties = itemType.GetProperties();

            foreach (var property in properties)
            {
                headers.Add(property.Name);
            }
        }

        return headers;
    }
}