How do you sort array of arrays in c#?

Question

I'm trying to sort a list of intervals based on start time (which is the first element).

public static int[][] SortIntervals(int[][] intervals)
{
    intervals.Sort(Comparer<int[]>.Create((a, b) => a[0].CompareTo(b[0]))); // error
    return intervals;
}

Error -CS1503 Argument 1: cannot convert from 'System.Collections.Generic.Comparer<int[]>' to 'System.Array'

I can sort a list of intervals just fine, maybe I'm missing the correct syntax for it.

public static List<int[]> SortIntervals(List<int[]> intervals)
{
    intervals.Sort(Comparer<int[]>.Create((a, b) => a[0].CompareTo(b[0])));
    return intervals;
}

Array.Sort(intervals, (a, b) => a[0].CompareTo(b[0]));

Dmitrii Bychenko
– Dmitrii Bychenko

2022-01-13 04:55:45 +00:00
Commented Jan 13, 2022 at 4:55 — Dmitrii Bychenko
– Dmitrii Bychenko, Commented Jan 13, 2022 at 4:55

Nicholas Carey · Accepted Answer · 2022-01-13 07:13:59Z

3

You are right, in case of array you should use different syntax Array.Sort:

public static int[][] SortIntervals(int[][] intervals)
{
    if (null == intervals)
        throw new ArgumentNullException(nameof(intervals));

    Array.Sort(intervals, (a, b) => a[0].CompareTo(b[0]));    

    return intervals;
}

edited Jan 13, 2022 at 7:13

Nicholas Carey

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answered Jan 13, 2022 at 4:57

Dmitrii Bychenko

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1 Comment

chaoz Over a year ago

Great, thank you!

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