C# appending values to empty array int[] doesn't work-CodePudding

I'm doing a windows form app and I need to declare empty array for some listbox operations. But i can't add value to array. When I try to print the lenght of the array after adding a value I reading the value 0 all the time.

public partial class Form1 : Form
    {
        public static int[] arrayOfNumbers = new int[] { };
        public Form1()
        {
            InitializeComponent();
        }
        
        public void button1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Add(textBox1.Text);
           
            arrayOfNumbers.Append(Convert.ToInt32(textBox1.Text));
            Console.WriteLine(arrayOfNumbers.Length);
            
        }

CodePudding user response：

Enumerable.Append appends an item to a sequence and returns it, so you need to use it to re-assign a new array to the field. But it doesn't return an arrray but IEnumerable<T>, so you have to append ToArray:

arrayOfNumbers = arrayOfNumbers.Append(Convert.ToInt32(textBox1.Text)).ToArray();

Arrays are a fixed size collection which you can't modify anyway.