C#中的反射:对属性进行分组并计算其他属性的和

using System;
using System.Reflection;
using System.Linq;

public class MyClass
{
    public int GroupId { get; set; }
    public int Value1 { get; set; }
    public int Value2 { get; set; }
}

public class Program
{
    public static void Main()
    {
        // 创建一个包含属性的对象列表
        var objects = new[]
        {
            new MyClass { GroupId = 1, Value1 = 10, Value2 = 20 },
            new MyClass { GroupId = 1, Value1 = 30, Value2 = 40 },
            new MyClass { GroupId = 2, Value1 = 50, Value2 = 60 },
            new MyClass { GroupId = 2, Value1 = 70, Value2 = 80 }
        };

        // 使用LINQ和反射对属性进行分组并计算其他属性的和
        var result = objects.GroupBy(obj => obj.GroupId)
                            .Select(group => new
                            {
                                GroupId = group.Key,
                                SumValue1 = group.Sum(obj => GetPropertyValue<int>(obj, "Value1")),
                                SumValue2 = group.Sum(obj => GetPropertyValue<int>(obj, "Value2"))
                            });

        // 输出结果
        foreach (var item in result)
        {
            Console.WriteLine($"GroupId: {item.GroupId}, SumValue1: {item.SumValue1}, SumValue2: {item.SumValue2}");
        }
    }

    // 使用反射获取属性的值
    public static T GetPropertyValue<T>(object obj, string propertyName)
    {
        var propertyInfo = obj.GetType().GetProperty(propertyName);
        return (T)propertyInfo.GetValue(obj);
    }
}