如何在C#中向数组添加项

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int>();
        numbers.Add(1);
        numbers.Add(2);
        numbers.Add(3);

        // 转换为数组
        int[] array = numbers.ToArray();
    }
}

using System;

class Program
{
    static void Main()
    {
        int[] array = new int[3] { 1, 2, 3 };
        Array.Resize(ref array, array.Length + 1);
        array[array.Length - 1] = 4;
    }
}

using System;

class Program
{
    static void Main()
    {
        int[] array = new int[3] { 1, 2, 3 };
        int[] newArray = new int[array.Length + 1];
        Array.Copy(array, newArray, array.Length);
        newArray[newArray.Length - 1] = 4;
    }
}