Question

I have two lists { 7 3 5 } and {9 8 1}.

I want to sort my first list and I want the second list to have the same index permutation as given by the first list.

{3 5 7} => {8 1 9}

Is it possible to do this in a single LINQ statement?

Answer 1

Sounds like you might want:

var list1 = new List<int> { 7, 3, 5 };
var list2 = new List<int> { 9, 8, 1 };

var orderedZip = list1.Zip(list2, (x, y) => new { x, y } )
                      .OrderBy(pair => pair.x)
                      .ToList();
list1 = orderedZip.Select(pair => pair.x).ToList();
list2 = orderedZip.Select(pair => pair.y).ToList();