在特定位置后，用lambda按字母顺序对列表进行排序

Question

Given a list with three elements that must stay at the top always:

Stay@Top1
Stay@Top2
Stay@Top3
Chicken
Bull
Zebra
Elephant
Hippo

Using lamdba expression, how can you sort this list alphabetically starting with "Chicken", and keeping the first three elements at the top?

Thanks ahead of time for any hints!

Answer 1

取前三个项目，然后与排序后的余数合并。

lst.Take(3).Concat(lst.Skip(3).OrderBy(s=>s);

Answer 2

尝试使用此：

list.Take(3).Concat(list.Skip (3).OrderBy (x => x.Name))

Answer 3

Given a List<T> where you wish to sort it but keep the first three elements at the start, you can use the overload of List<T>.Sort(int index, int count, IComparer<T> comparer) which lets you specify the range of elements to sort.

So you could do (assuming List<string> ):

lst.Sort(3, lst.Length - 3, Comparer<string>.Default);

This doesn't use a lambda like you asked for - but I don't see why you need to use a lambda. ;)

An in-place sort is going to be much more efficient, if you can use it.

Answer 4

var final = lst.Take(3).ToList(); ;

var sortedSet = lst.Skip(3).OrderBy(x => x);

final.AddRange(sortedSet);