在LINQ中，可以使用GroupBy操作符按时间跨度对数据进行分组。下面是一个使用LINQ的代码示例，按时间跨度分组订单列表的示例：

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

public class Order
{
    public int OrderId { get; set; }
    public DateTime OrderDate { get; set; }
    public decimal TotalAmount { get; set; }
}

public class Program
{
    public static void Main()
    {
        List orders = new List
        {
            new Order { OrderId = 1, OrderDate = new DateTime(2022, 1, 1), TotalAmount = 100 },
            new Order { OrderId = 2, OrderDate = new DateTime(2022, 1, 15), TotalAmount = 200 },
            new Order { OrderId = 3, OrderDate = new DateTime(2022, 2, 1), TotalAmount = 150 },
            new Order { OrderId = 4, OrderDate = new DateTime(2022, 2, 15), TotalAmount = 250 },
            new Order { OrderId = 5, OrderDate = new DateTime(2022, 3, 1), TotalAmount = 300 }
        };

        // 按月份分组
        var ordersByMonth = orders.GroupBy(o => new { o.OrderDate.Year, o.OrderDate.Month });

        // 遍历每个月份的订单
        foreach (var group in ordersByMonth)
        {
            Console.WriteLine($"Month: {group.Key.Year}-{group.Key.Month}");

            foreach (var order in group)
            {
                Console.WriteLine($"Order: {order.OrderId}, Amount: {order.TotalAmount}");
            }

            Console.WriteLine();
        }
    }
}

这个示例将订单列表按照月份进行分组，并输出每个月份的订单信息。运行结果如下：

Month: 2022-1
Order: 1, Amount: 100
Order: 2, Amount: 200

Month: 2022-2
Order: 3, Amount: 150
Order: 4, Amount: 250

Month: 2022-3
Order: 5, Amount: 300

可以根据需要修改代码来按照不同的时间跨度进行分组，例如按季度、年份等。