linqts -按多个属性分组

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

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }
    public string Category { get; set; }
}

public class Program
{
    public static void Main()
    {
        List<Product> products = new List<Product>
        {
            new Product { Id = 1, Name = "Laptop", Price = 1200.00m, Category = "Electronics" },
            new Product { Id = 2, Name = "Smartphone", Price = 800.00m, Category = "Electronics" },
            new Product { Id = 3, Name = "Chair", Price = 150.00m, Category = "Furniture" },
            new Product { Id = 4, Name = "Table", Price = 300.00m, Category = "Furniture" },
            new Product { Id = 5, Name = "Headphones", Price = 100.00m, Category = "Electronics" }
        };

        var groupedProducts = products
            .GroupBy(p => new { p.Category, p.Price })
            .Select(g => new
            {
                Category = g.Key.Category,
                Price = g.Key.Price,
                Count = g.Count()
            });

        foreach (var group in groupedProducts)
        {
            Console.WriteLine($"Category: {group.Category}, Price: {group.Price}, Count: {group.Count}");
        }
    }
}