How to get biggest element in HashSet of object by field?-CodePudding

Suppose I have the class

public class Point {
    public float x, y, z;
}

And I've created this hashset:

HashSet<Point> H;

How can I get the element of H with the biggest z? It doesn't need necessarily to use Linq.

CodePudding user response：

You can use Aggregate to mimic MaxBy functionality (note that you need to check if collection has any elements first):

var maxByZ = H.Aggregate((point, point1) => point.z > point1.z ? point : point1);

When .NET 6 is out it should have built in MaxBy.

CodePudding user response：

You could do this:

int maxZ = H.Max(point => point.Z);
var maxPointByZ = H.Where(point => point.Z == maxZ).FirstOrDefault();

This works by first retrieving the largest value of Z in the set:

H.Max(point2 => point2.Z) //Returns the largest value of Z in the set

And then by doing a simple where statement to get the record where Z is equal to that value. If there are multiple values, it will get the first one, so you may want to sort the enumerable in advance.