Changing size of array in extension method does not work?

Question

So basically I wrote my little Add extension method for array types.

using System;
using System.Linq;
public static class Extensions 
{
    publ         


        

Answer 1

You may change code like this:

public static class Extensions 
{
    public static T[] Add(this T[] _self, T item)
    {
        return _self.Concat(new T[] { item }).ToArray();
    }
}
public class Program
{
    public static void Main()
    {
        string[] test = { "Hello" };
        test = test.Concat(new string[] { "cruel" }).ToArray();
        test = test.Add("but funny");
        Console.WriteLine(String.Join(" ", test) + " world");
    }
}

As a side note - usage will be same as Concat method.