LINQ group by并筛选特定记录

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

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

public class Program
{
    public static void Main()
    {
        List<Product> products = new List<Product>
        {
            new Product { Category = "Electronics", Name = "Laptop", Price = 1000 },
            new Product { Category = "Electronics", Name = "Smartphone", Price = 800 },
            new Product { Category = "Clothing", Name = "T-Shirt", Price = 20 },
            new Product { Category = "Clothing", Name = "Jeans", Price = 50 }
        };

        // Group by Category and filter products with price > 50
        var groupedProducts = products
            .GroupBy(p => p.Category)
            .Where(g => g.Any(p => p.Price > 50))
            .SelectMany(g => g);

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