C# 数组Array

数组是对相同类型的一组数据的封装。数组定义的时候，要说明是对哪一种类型的封装，并且要指定长度。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestArrayList
{
    class Program
    {
        static void Main(string[] args)
        {
            //System.Array
            //1、数组[]特定类型、固定长度
            string[] str1 = new string[3];
            str1[0] = "a";
            str1[1] = "b";
            str1[2] = "c";
            Console.WriteLine(str1[2]);

            string[] str2 = new string[] { "a", "b", "c" };
            Console.WriteLine(str2[0]);

            string[] str3 = { "a", "b", "c" };
            Console.WriteLine(str3[0]);

            //2.二维数组
            //int[,] intArray = new int 
            int[,] intArray = new int[2, 3];
            intArray[0, 0] = 1;
            intArray[0, 1] = 11;
            intArray[0, 2] = 111;
            intArray[1, 0] = 2;
            intArray[1, 1] = 22;
            intArray[1, 2] = 222;
            Console.WriteLine("{0},{1},{2}", intArray[0, 0], intArray[0, 1], intArray[0, 2]);
            Console.WriteLine("{0},{1},{2}", intArray[1, 0], intArray[1, 1], intArray[1, 2]);

            //3多维数组
            int[, ,] intArray1 = new int[,,]
            {
               {{1,1},{11,11},{111,111}},
               {{2,2},{22,22},{33,33}},
               {{3,3},{33,33},{333,333}}
            };
            Console.WriteLine("多维数组");
            Console.WriteLine("{0},{1},{2},{3},{4},{5}", intArray1[0, 0, 0], intArray1[0, 0, 1], intArray1[0, 1, 0], intArray1[0, 1, 1], intArray1[0, 2, 0], intArray1[0, 2, 1]);
            Console.WriteLine("{0},{1},{2},{3}", intArray1[1, 0, 0], intArray1[1, 0, 1], intArray1[1, 1, 0], intArray1[1, 1, 1]);
            Console.WriteLine("{0},{1},{2},{3},{4},{5}", intArray1[2, 0, 0], intArray1[2, 0, 1], intArray1[2, 1, 0], intArray1[2, 1, 1], intArray1[2, 2, 0], intArray1[2, 2, 1]);

            //4交错数组即数组的数组
            int[][] intArray2 = new int[4][];
            intArray2[0] = new int[] { 1 };
            intArray2[1] = new int[] { 2, 22 };
            intArray2[2] = new int[] { 3, 33, 333 };
            intArray2[3] = new int[] { 4, 44, 444, 4444 };
            Console.WriteLine("交错数组");
            for (int i = 0; i < intArray2.Length; i++)
            {
                for (int j = 0; j < intArray2[i].Length; j++)
                {
                    Console.WriteLine("{0}", intArray2[i][j]);
                }
            }
            Console.ReadKey();
            int[] myIntArray = new int[5] { 1, 2, 3, 4, 5 };
            Object[] myObjArray = new Object[5] { 26, 27, 28, 29, 30 };
            Console.WriteLine("Initially,");
            Console.Write("integer array:");
            PrintValues(myIntArray);
            Console.Write("Object array: ");
            PrintValues(myObjArray);

            System.Array.Copy(myIntArray, myObjArray, 2);

            Console.WriteLine("\n After copying the first two elements of the integer array to the Object array.");
            Console.Write("integer array:");
            PrintValues(myIntArray);
            Console.Write("Object array: ");
            PrintValues(myObjArray);

            System.Array.Copy(myObjArray, myObjArray.GetUpperBound(0) - 1, myIntArray, myIntArray.GetUpperBound(0) - 1, 2);

            Console.WriteLine("\nAfter copying the last two elements of the object array to the integer array,");
            Console.Write("integer array:");
            PrintValues(myIntArray);
            Console.Write("Object array:");
            PrintValues(myObjArray);
            Console.ReadKey();
        }

        public static void PrintValues(Object[] myArr)
        {
            foreach (Object i in myArr)
            {
                Console.Write("\t{0}", i);
            }
            Console.WriteLine();
        }

        public static void PrintValues(int[] myArr)
        {
            foreach (int i in myArr)
            {
                Console.Write("\t{0}", i);
            }
            Console.WriteLine();
        }
    }
}

运行结果如下：

数组是一种数据类型，并且二维数组在图像处理中会应用。一维数组的起始下标是[0]。二维数组的起始下标是[0,0]。交错也称参差数组的起始下标是[0][0]。

数组一定是固定长度和类型确定并且有序的，这种呆板的数据类型，导致它的INSERT，非常不方便，于是有了ArrayList

那么C#中数组是引用类型？还是值类型？C#中数组是引用类型，为什么是引用类型，依据是什么？