How can i custom sort dictionary by value base near zero via c#

Question

I have a Dictionary<int, double> and i want to custom sort it. But is it a little different sorting.

For example here is the codes:

Dictionary<int, double> dicZeroPeriods = new Dictionary<int, double>();
dicZeroPeriods.Add (80,-3.5);
dicZeroPeriods.Add (90,-2.4);
dicZeroPeriods.Add (50,4.2);
dicZeroPeriods.Add (65,1.2);

So how can i custom sort the dicZeroPeriods by value base near zero. I mean the result should be:

65,1.2
90,-2.4
80,-3.5
50,4.2

`Dictionary` don't have a sort method you may need to use `SortedDictionary` check this post [How to use custom IComparer for SortedDictionary?](http://stackoverflow.com/questions/2720009/how-to-use-custom-icomparer-for-sorteddictionary), or recreate the dictionary in sorted order — bansi, Mar 01 '17 at 06:00
I can't use SortedDictionary because i have some same entries. — lotomax, Mar 01 '17 at 06:02

teo van kot · Accepted Answer · 2017-03-01T06:04:40.233

4

Just use OrderBy with Math.Abs function. Here you go:

dicZeroPeriods = dicZeroPeriods.OrderBy(x => Math.Abs(x.Value))
            .ToDictionary(x => x.Key, x => x.Value);

edited Mar 01 '17 at 06:04

answered Mar 01 '17 at 05:58

teo van kot

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Thank you for your answer. It is working clearly. And how can i do that without LINQ? – lotomax Mar 01 '17 at 06:09
@lotomax I can say how. With a lot of pain. Write loop manually and realize one of sorting algorithm. – teo van kot Mar 01 '17 at 06:18
Thank you, i need that because i wanna use this in JAVA. And there is no LINQ sorting in java. – lotomax Mar 01 '17 at 06:23

score 0 · Answer 2 · answered Mar 01 '17 at 06:03

0

use Math.Abs() to sort your dictionary elements by its absolute values. Math.Abs(1.2) < Math.Abs(-3.5) and so on.

answered Mar 01 '17 at 06:03

Gramin

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How can i custom sort dictionary by value base near zero via c#

2 Answers2