在Linq中添加嵌套类列表中的嵌套值

List<OuterClass> outerList = new List<OuterClass>
{
    new OuterClass
    {
        Id = 1,
        Name = "Outer 1",
        InnerList = new List<InnerClass>
        {
            new InnerClass { Id = 1, Name = "Inner 1" },
            new InnerClass { Id = 2, Name = "Inner 2" }
        }
    },
    new OuterClass
    {
        Id = 2,
        Name = "Outer 2",
        InnerList = new List<InnerClass>
        {
            new InnerClass { Id = 3, Name = "Inner 3" },
            new InnerClass { Id = 4, Name = "Inner 4" }
        }
    }
};

int outerId = 1; // 外部类的 Id
string newInnerName = "New Inner";

var query = from outer in outerList
            where outer.Id == outerId
            select new OuterClass
            {
                Id = outer.Id,
                Name = outer.Name,
                InnerList = outer.InnerList.Concat(new List<InnerClass>
                {
                    new InnerClass { Id = outer.InnerList.Max(i => i.Id) + 1, Name = newInnerName }
                }).ToList()
            };

OuterClass updatedOuter = query.FirstOrDefault();