LINQ用于对列表进行分组并返回包含嵌入式字典的自定义对象列表

// 自定义对象类
public class CustomObject
{
    public string Key { get; set; }
    public int Value { get; set; }
}

// 列表数据
List<CustomObject> list = new List<CustomObject>
{
    new CustomObject { Key = "A", Value = 1 },
    new CustomObject { Key = "B", Value = 2 },
    new CustomObject { Key = "A", Value = 3 },
    new CustomObject { Key = "B", Value = 4 }
};

// 使用LINQ进行分组并返回包含嵌入式字典的自定义对象列表
var result = list.GroupBy(obj => obj.Key)
                 .Select(group => new CustomObject
                 {
                     Key = group.Key,
                     Value = group.Sum(obj => obj.Value)
                 })
                 .ToList();

// 输出结果
foreach (var obj in result)
{
    Console.WriteLine($"Key: {obj.Key}, Value: {obj.Value}");
}