c# linq按日期时间分组到最接近的秒数

var groupedData = dataList.GroupBy(d => (int)d.DateTime.TimeOfDay.TotalSeconds);

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

public class Program
{
    public static void Main()
    {
        // 模拟的日期时间数据
        var dataList = new List<Data>
        {
            new Data { DateTime = new DateTime(2022, 1, 1, 10, 0, 1) },
            new Data { DateTime = new DateTime(2022, 1, 1, 10, 0, 2) },
            new Data { DateTime = new DateTime(2022, 1, 1, 10, 0, 3) },
            new Data { DateTime = new DateTime(2022, 1, 1, 10, 0, 4) },
            new Data { DateTime = new DateTime(2022, 1, 1, 10, 0, 5) },
            new Data { DateTime = new DateTime(2022, 1, 1, 10, 0, 6) }
        };

        var groupedData = dataList.GroupBy(d => (int)d.DateTime.TimeOfDay.TotalSeconds);

        foreach (var group in groupedData)
        {
            Console.WriteLine($"秒数：{group.Key}");
            foreach (var data in group)
            {
                Console.WriteLine($"日期时间：{data.DateTime}");
            }
            Console.WriteLine();
        }
    }
}

public class Data
{
    public DateTime DateTime { get; set; }
}