Csharp/C#核心/Lesson6_封装-索引器练习/Program.cs

using System.Runtime.InteropServices;

namespace Lesson6_封装_索引器练习
{
    class IntArray
    {
        private int[] array;
        private int used, capacity;
        public IntArray()
        {
            capacity = 5;
            array = new int[capacity];
            used = 0;
        }
        //增
        public void Add(int value)
        {
            if (used < capacity)
            {
                array[used] = value;
                used++;
            }
            else
            {
                capacity += 1;
                int[] newArray = new int[capacity];
                for (int i = 0; i < array.Length; i++)
                {
                    newArray[i] = array[i];
                }
                array = newArray;

                array[used] = value;
                used++;
            }
        }
        //删
        public void DelValue(int target)
        {
            for (int i = 0; i < used; i++) 
            { 
                if(target == array[i])
                {
                    DelIndex(i);
                    return;
                }
            }
            Console.WriteLine("没找到");
        }
        public void DelIndex(int target)
        {
            if (target > array.Length - 1)
            {
                Console.WriteLine("当前数组只有{0}长，溢出",used);
            }
            else
            {
                for (int i = target; i < used-1; i++)
                {
                    array[i] = array[i + 1];
                }
                for (int i = used - 1; i < used; i++)
                {
                    array[i] = 0;
                }
            }
            --used;
            
        }
        public int this[int index] 
        { 
            get 
            {
                if (index >= capacity)
                {
                    Console.WriteLine("已溢出,当前index:"+index+'\n'+"当前已用值:"+(used)+"当前容量:"+(capacity));
                    return 0;
                }
                else 
                {
                    return array[index]; 
                }
                    
            }
            set 
            {
                Console.WriteLine(index);
                array[index] = value;
            } 
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
            IntArray a = new IntArray();
            a.Add(1);
            a.Add(2);
            a.Add(3);
            a.Add(4);
            a.Add(5);
            a.Add(6);
            a.Add(7);
            a.Add(8);
            a.Add(9);
            a.Add(10);
            Console.WriteLine("dfdf" + a[0]);
            Console.WriteLine("dfdf" + a[1]);
            Console.WriteLine("dfdf" + a[2]);
            Console.WriteLine("dfdf" + a[3]);
            Console.WriteLine("dfdf" + a[4]);
            Console.WriteLine("dfdf" + a[5]);
            Console.WriteLine("dfdf" + a[6]);
            Console.WriteLine("dfdf" + a[7]);
            Console.WriteLine("dfdf" + a[8]);
            Console.WriteLine("dfdf" + a[9]);
            Console.WriteLine("越界测试" + a[10]);
            Console.WriteLine();
            a.DelIndex(3);
            Console.WriteLine("dfdf" + a[0]);
            Console.WriteLine("dfdf" + a[1]);
            Console.WriteLine("dfdf" + a[2]);
            Console.WriteLine("dfdf" + a[3]);
            Console.WriteLine("dfdf" + a[4]);
            Console.WriteLine("dfdf" + a[5]);
            Console.WriteLine("dfdf" + a[6]);
            Console.WriteLine("dfdf" + a[7]);
            Console.WriteLine("dfdf" + a[8]);
            Console.WriteLine("dfdf" + a[9]);
            Console.WriteLine();
            a.DelValue(7);
            Console.WriteLine("dfdf" + a[0]);
            Console.WriteLine("dfdf" + a[1]);
            Console.WriteLine("dfdf" + a[2]);
            Console.WriteLine("dfdf" + a[3]);
            Console.WriteLine("dfdf" + a[4]);
            Console.WriteLine("dfdf" + a[5]);
            Console.WriteLine("dfdf" + a[6]);
            Console.WriteLine("dfdf" + a[7]);
            Console.WriteLine("dfdf" + a[8]);
            Console.WriteLine("dfdf" + a[9]);
        }
    }
}