列表ArrayList

Question

    ArrayList arr1 = new ArrayList();       
    object item = new object();             
    item = "hello";                         
    arr1.Add(item);                         
    item = 1;                               
    arr1.Add(item);                         
    int[] arr2 = new int[] { 1, 2, 3 };     
    arr1.Insert(1, arr2);
请问如何输出arr1的值（hello,1,2,3,1）？

Answer 1

public Form1()
        {
            InitializeComponent();            ArrayList arr1 = new ArrayList();
            object item = new object();
            item = "hello";
            arr1.Add(item);
            item = 1;
            arr1.Add(item);
            int[] arr2 = new int[] { 1, 2, 3 };
            arr1.Insert(1, arr2);            List<string> list = new List<string>();            Process(list, arr1.ToArray());
            string s = string.Join(",", list.ToArray());        }        private void Process(List<string> list, object obj)
        {
            if (obj is Array)
            {
                foreach (var item in (Array)obj)
                {
                    Process(list, item);
                }
            }
            else
            {
                list.Add(obj.ToString());
            }
        }

Answer 2

因为 C# 的强型态(强型别)
现在加到 ArrayList 裹的东西，包括 object (string) 和 int[]
所以这应该已经是比较简单的方法了~如果要"呼叫"更简单 那可能另外写 extension method
那只是呼叫端简单而已，基本原理应该都差不多吧~

Answer 3

static void Main(string[] args)
        {
            ArrayList arr1 = new ArrayList();
            object item = new object();
            item = "hello";
            arr1.Add(item);
            item = 1;
            arr1.Add(item);
            int[] arr2 = new int[] { 1, 2, 3 };
            arr1.Insert(1, arr2);            Print(arr1);
            Console.Read();
        }        public static void Print(IEnumerable myList)
        {
            foreach (Object obj in myList)
            {
                if (obj is int[])
                {
                    foreach (int item in (int[])obj)
                    {
                        Console.Write(" {0}", item);
                    }
                }
                else
                {
                    Console.Write(" {0}", obj);
                }
            }
        }