Sort on List with KeyValuePair

Question

I have this code:

List<KeyValuePair<String,List<MyObject>>> aux = retEmpty.ToList();
aux.ForEach(x => ret.Add(x.Key, x.Value));

I need to sort "ret" by the first element("string"). I tried a couple example but none of them work. Any help?

What have you tried ? Can you be more descriptive what would You like to achive ? — Dawid Dziadkiewicz, Nov 13 '13 at 12:39

score 2 · Accepted Answer · answered Nov 13 '13 at 12:39

2

Did you try replacing the second line with:

aux.OrderBy(x=>x.Key).ToList().ForEach(x=>ret.Add(x.Key,x.Value));

?

answered Nov 13 '13 at 12:39

Boluc Papuccuoglu

This won't work because ret is a simple Dictionary and the [order of elements in a Dictionary is non-deterministic](http://stackoverflow.com/a/4007787/2504607) – Kabbalah Nov 13 '13 at 12:46
Yes, I posted the answer before the comments on ret being a Dictionary. – Boluc Papuccuoglu Nov 13 '13 at 12:47
1

Fair enough. I made my comment just to clarify for future reference. – Kabbalah Nov 13 '13 at 12:50
@RicardoNeves Be careful using this method because it's just pure luck that a Dictionary returns values in the same order they where added. – Kabbalah Nov 13 '13 at 12:51

score 1 · Answer 2 · answered Nov 13 '13 at 12:40

1

Based on your comment you can simply use a SortedDictionary

var ret = new SortedDictionary<String,List<MyObject>>();
ret.Add(...

answered Nov 13 '13 at 12:40

VladL

score 0 · Answer 3 · answered Nov 13 '13 at 12:40

0

Did you try something like:

var v = from obj in ret
    orderby obj.Key
    select obj

answered Nov 13 '13 at 12:40

Noctis

score 0 · Answer 4 · answered Nov 13 '13 at 12:40

0

ret looks like a Dictionary. If this assumption is correct you could use a SortedDictionary instead.

answered Nov 13 '13 at 12:40

Kabbalah

4 Answers4