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I have aList<XYZ>, let's call itoListXYZ.

{{3,2,1},{6,5,4},{9,8,7}}

and aList<double>we'll calloListD.

{9,2,5}

Both lists are related, i.eoListD[i]corresponds tooListXYZ[i].I need to sort theXYZvalues inoListXYZaccording to their correspondingdoublevalues inoListD, like so:

{2,5,9} {{6,5,4},{9,8,7},{3,2,1}}

UsingoListD.Sortgives the desired order, but i need a way to sortoListXYZfollowing said order.

I have tried with LINQ or the solution described here, but haven't found the desired results yet.

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  • I don't understand the question @_@. Commented Feb 6, 2020 at 8:53
  • what is their 'corresponding double value'? I dont think you've given enough info here for us to help Commented Feb 6, 2020 at 8:53
  • Can you post some tests case (i.e. a list of inputs/outputs)? Commented Feb 6, 2020 at 8:57

1 Answer 1

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Use Enumerable.Zip to combine them, then OrderBy to order

Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results.

var list = new List<(int, int, int)>(){(3, 2, 1),(6, 5, 4),(9, 8, 7)}; var doubles = new List<double>(){9,2,5}; var results = list.Zip(doubles, (tuple, d) => (t: tuple, d: d)) .OrderBy(x => x.d) .Select(x => x.t); foreach (var result in results) Console.WriteLine(result);

Output

(6, 5, 4) (9, 8, 7) (3, 2, 1)
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2 Comments

Your answer is superb - it's easily better than the ones in the duplicate question - I'd suggest you go and post yours there too (with a bit of tweaking).
Exactly the kind of solution i was looking for. Simple and to the point. Thank you.

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