GroupBy partitions a list of numbers by their remainder when divided by 5. : GroupBy « LINQ « C# / CSharp Tutorial

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C# / CSharp Tutorial » LINQ » GroupBy 
22.47.2.GroupBy partitions a list of numbers by their remainder when divided by 5.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {

        int[] numbers = 5413};

        var numberGroups =
            from n in numbers
            group n by n % into g
            select new Remainder = g.Key, Numbers = g };

        foreach (var g in numberGroups) {
            Console.WriteLine("Numbers with a remainder of {0} when divided by 5:", g.Remainder);
            foreach (var n in g.Numbers) {
                Console.WriteLine(n);
            }
        }
    }
}
22.47.GroupBy
22.47.1.Use Group By
22.47.2.GroupBy partitions a list of numbers by their remainder when divided by 5.
22.47.3.uses group by to partition a list of products by category.
22.47.4.uses group by to partition a list of each customer's orders, first by year, and then by month.
22.47.5.uses GroupBy to partition trimmed elements of an array using a custom comparer
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