C# 嵌套字典排序

linq两种写法，如下所示：

1.

var resultInformation = from outer in userInformation
                        from inner in outer.Value
                        let data = new { Outer = outer.Key, Inner = inner.Key, Value = inner.Value }
                        orderby data.Outer, data.Inner, data.Value
                        select data;

2.

var resultInformation = 
    from student in userInformation
    orderby student.Key
    select new
    {
        studentId = student.Key,
        courses = 
            from courseScore in student.Value
            orderby courseScore.Value descending
            select new {
                course = courseScore.Key,
                score = courseScore.Value
            }
    };

等价写法：

var resultInformation = userInformation
    .SelectMany(i => i.Value, (key, inner) => new { Outer = key, Inner = inner.Key, Value = inner.Value})
    .OrderBy(e => e.Outer)
    .ThenBy(e => e.Inner)
    .ThenBy(e => e.Value);