How to sort the list of objects by the values coming from array? [duplicate]

Question

I have a List products; with 100+ items.

For each item from the list I have product id.

And I have an array int[] sortedArray = {3,6,22,98,6,45,87};

I have to sort my product list and make order by productid, how it is in sortedArray. How can I implement that?

Thanks in Advance!

What is in sortedArray? Is it indices, or product IDs?

Matthew Watson
– Matthew Watson

2020-01-27 12:05:35 +00:00
Commented Jan 27, 2020 at 12:05 — Matthew Watson
– Matthew Watson, Commented Jan 27, 2020 at 12:05

Mihai Alexandru-Ionut · Accepted Answer · 2020-01-27 12:05:51Z

2

One possible approach could be using OrderBy method by passing a Func which uses IndexOf method in order to sort the list based on the sortedArray.

list.OrderBy(s => sortedArray.IndexOf(s.ProductId)).ToList();

edited Jan 27, 2020 at 12:05

answered Jan 27, 2020 at 11:59

Mihai Alexandru-Ionut

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2 Comments

Matthew Watson Over a year ago

Watch out though - this is an O(N^2.Log(N)) operation which is going to be nasty on large data sets.

Mihai Alexandru-Ionut Over a year ago

@MatthewWatson, Then we could create a hash structure or dictionary in order to access the element with O(1)

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