c# - Identically sorting two lists

Question

I have on list of strings, and one list of integers. They come in "pairs", i.e. at an index, the given string and integer must still be "matched up". I need to sort the integers in descending order and have the strings sort identically, so the pairs are intact. I imagine the best way to achieve may be to just put them into List>, but I'm not sure how that could be sorted by the second Tuple item.

Answer 1

The easiest way is to put them into a single List, and then order that list:

List<string> list = new List<string>() { "A", "C", "T", "F" };
List<int> list2 = new List<int>() { 5, 4, 3, 2 };

var results = list.Zip(list2, (a, b) => new
{
    str = a,
    num = b
})
.OrderBy(pair=> pair.num);

If you really need a list of just the strings you could use a Select to get them back out, but hopefully it just makes sense to have a single list of a more complex object throughout your program. (Consider making an actual class, rather than using an anonymous one, if you do that.)