使用Linq扩展从每个类别中获取最后一项

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        // 假设我们有一个包含多个类别的列表
        var items = new[]
        {
            new { Category = "A", Item = "Item 1" },
            new { Category = "A", Item = "Item 2" },
            new { Category = "B", Item = "Item 3" },
            new { Category = "B", Item = "Item 4" },
            new { Category = "C", Item = "Item 5" },
            new { Category = "C", Item = "Item 6" }
        };

        // 使用Linq扩展从每个类别中获取最后一项
        var lastItemsByCategory = items
            .GroupBy(x => x.Category) // 按类别进行分组
            .Select(g => g.Last()); // 选择每个组的最后一项

        // 输出结果
        foreach (var item in lastItemsByCategory)
        {
            Console.WriteLine($"Category: {item.Category}, Last Item: {item.Item}");
        }
    }
}

Category: A, Last Item: Item 2
Category: B, Last Item: Item 4
Category: C, Last Item: Item 6