Array转换ArrayList

1. Foreach

2. ArrayList.Adapter.

3. ArrayList to Array. 强制转换Array result = (int[])arrayList.ToArray(typeof(int))

class Program
    {
        static void Main(string[] args)
        {
            int[] arrayInt = new int[] { 1, 2, 3, 4 };
            ArrayList arrlistInt = new ArrayList();
            //方法一
            foreach (int a in arrayInt)
            {
                arrlistInt.Add(a);
            }
            Console.WriteLine(arrlistInt[2].ToString());//输出3
            //方法二：
            ArrayList arrlistInt2 = ArrayList.Adapter(arrayInt);         
            Console.WriteLine(arrlistInt2[2].ToString());//输出3
            //逆向转换
            Array resultArr = (int[])arrlistInt2.ToArray(typeof(int));
            Console.WriteLine(resultArr.GetValue(2));//输出3
        }
    }