Question

In C#:

List<List<Point>> SectionList = new List<List<Point>>();

SectionList contains lists of points where each sub list varies in how many points it contains.

What I’m trying to figure out is how to sort SectionList by the Count of sub lists in descending order.

So if SectionList had 3 lists of points, after sorting, SectionList[0] would contain the highest Count value of all 3 lists.

Thanks,
Mythics

Answer 1

This should work:

SectionList.Sort((a,b) => a.Count - b.Count);

The (a,b) => a.Count - b.Count is a comparison delegate. The Sort method calls it with pairs of lists to compare, and the delegate that returns a negative number if a is shorter than b, a positive number if a is longer than b, and zero when the two lists are of the same length.