Create duplicate items and submit them inside a list

user_18624767 0
Viewed 81

Hello let me show you the problem with very simple explanation.

I have this;

int[] numbers1= { 1, 2, 3 };

and i need this;

int[] numbers2= { 1,1,1, 2,2,2, 3,3,3 };

how can i duplicate my values then use them in another list?

c#
4 Answers

Try:

using System.Linq;

namespace WebJob1
{
    internal class Program
    {

        static void Main()
        {
            int[] numbers1 = { 1, 2, 3 };
            var numbers2 = numbers1.SelectMany(x => Enumerable.Repeat(x,3)).ToArray();
        }
    }
}
user_172395460
user_2196610

You can try this:

    int multiplier = 3;
    int[] numbers1 = { 1, 2, 3 };

    var numbers2 = numbers1.SelectMany(x => Enumerable.Repeat(x, multiplier)).ToArray();

Maybe some useful information about LINQ extentions Select and SelectMany here.

user_119323130

What about an algoritmic answer:

public class Program
{
    public static void Main()
    {
        int[] numbers1= { 1, 2, 3 };
        var numbers2 = ArrayMultiplier.MultiplyArray(numbers1, 3);  //{ 1,1,1,2,2,2,3,3,3 }
    }
    
    public static class ArrayMultiplier{
        public static int[] MultiplyArray(int[] array, int multiplicationCount){
            int[] result = new int[array.Length*multiplicationCount];
            for(int i =0; i<array.Length; i++){
                for(int j = 0; j<multiplicationCount; j++){
                    result[i*multiplicationCount + j] = array[i];
                }
            }
            return result;
        }
    }   
}
user_115882310
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