C# string Dictionary sorting

Question

I want to sort below dictionary by Key.

Dictionary<string, string> Numbers;

Sample data:

(100,+100)
(24,+24)
(214,+214)
(3,+3)
(1,+1)

Expected Output:

(1,+1)
(3,+3)
(24,+24)
(100,+100)
(214,+214)

If I use SortedDictionary, my output is

(1,+1)(100,+100)(24,+24)(214,+214)(3,+3)

Could you use a SortedDictionary instead? msdn.microsoft.com/en-us/library/f7fta44c(v=vs.110).aspx — Marco Alves
– Marco Alves, Commented Dec 1, 2015 at 0:05
If I use SortedDictionary<string, string> . My output is (1,+1)(100,+100)(24,+24)(214,+214)(3,+3) — user3194721
– user3194721, Commented Dec 1, 2015 at 0:11
Just for completeness, the reason the sorted dictionary didn't work is because you have a string for the key value. The sort order is correct for a string sort. By using @gaemaf answer you are indicating that the key can be an int value. Your best course of action is to change Numbers to Numbers<int, string> and have the key be an integer everywhere. And just to be pedantic, the sort dictionary result with a string key is (1, +1)(100, +100)(214, +214)(24, +24)(3, +3) — Gridly
– Gridly, Commented Dec 1, 2015 at 1:42

Rob · Accepted Answer · 2015-12-01 00:28:32Z

2

You can use the SortedDictionary but you need to rearrange your input or preserve your type:

Dictionary<string, string> Numbers = new Dictionary<string, string> {
  {"100","+100"},
  {"24","+24"},
  {"214","+214"},
  {"3","+3"},
  {"1","+1"}};

Numbers = Numbers.OrderBy(key => int.Parse(key.Key)).ToDictionary((keyItem) => keyItem.Key, (valueItem) => valueItem.Value);

SortedDictionary<int, string> Numbers1 = new SortedDictionary<int, string> {
  {100,"+100"},
  {24,"+24"},
  {214,"+214"},
  {3,"+3"},
  {1,"+1"}};

edited Dec 1, 2015 at 0:28

Rob♦

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answered Dec 1, 2015 at 0:20

gaetanoM

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Community · Accepted Answer · 2017-05-23 12:15:11Z

1

The dictionary type is inherently unordered, but you can use a SortedDictionary instead.

A similar question was answered in more detail here: https://stackoverflow.com/a/2705623/2608569

edited May 23, 2017 at 12:15

CommunityBot

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answered Dec 1, 2015 at 0:14

Fritz Huie

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