linq返回dynamic类型的匿名实体

这样会报错：

void Main()
{
    var  x=GetSpareInfoByCode();
    Console.Write(x.Key);//报错：“object”未包含“Key”的定义
}
    public dynamic  GetSpareInfoByCode(){
    var words =
        from word in "The quick brown fox jumps over the lazy dog".Split()
        orderby word.ToUpper()
        select word;
        
    var duplicates =
        from word in words
        group word.ToUpper() by word.ToUpper() into g
        where g.Count() > 1
        select new { g.Key, Count = g.Count() };
            return duplicates;
        }

使用tolist

void Main()
{
    //var  x=GetSpareInfoByCode();
    IEnumerable<object> y=GetSpareInfoByCode();
    //foreach (var item in (IEnumerable<object>)x)
    foreach (var item in y)
    {
        Console.Write(item.GetType().GetProperty("Key").GetValue(item, null));
        Console.Write(item.GetType().GetProperty("Count").GetValue(item, null));
    }
}
    public dynamic  GetSpareInfoByCode(){
    var words =
        from word in "The quick brown fox jumps over the lazy dog".Split()
        orderby word.ToUpper()
        select word;
        
    var duplicates =
        from word in words
        group word.ToUpper() by word.ToUpper() into g
        where g.Count() > 1
        select new { g.Key, Count = g.Count() };
            return duplicates.ToList();
        }

有木有更简单高效的方式呢