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。

  1 using system;
  2 using system.collections.generic;
  3 using system.linq;
  4 using system.text;
  5 
  6 namespace testarraylist
  7 {
  8     class program
  9     {
 10         static void main(string[] args)
 11         {
 12             //system.array
 13             //1、数组[]特定类型、固定长度
 14             string[] str1 = new string[3];
 15             str1[0] = "a";
 16             str1[1] = "b";
 17             str1[2] = "c";
 18             console.writeline(str1[2]);
 19 
 20             string[] str2 = new string[] { "a", "b", "c" };
 21             console.writeline(str2[0]);
 22 
 23             string[] str3 = { "a", "b", "c" };
 24             console.writeline(str3[0]);
 25 
 26             //2.二维数组
 27             //int[,] intarray = new int 
 28             int[,] intarray = new int[2, 3];
 29             intarray[0, 0] = 1;
 30             intarray[0, 1] = 11;
 31             intarray[0, 2] = 111;
 32             intarray[1, 0] = 2;
 33             intarray[1, 1] = 22;
 34             intarray[1, 2] = 222;
 35             console.writeline("{0},{1},{2}", intarray[0, 0], intarray[0, 1], intarray[0, 2]);
 36             console.writeline("{0},{1},{2}", intarray[1, 0], intarray[1, 1], intarray[1, 2]);
 37 
 38             //3多维数组
 39             int[, ,] intarray1 = new int[,,]
 40             {
 41                {{1,1},{11,11},{111,111}},
 42                {{2,2},{22,22},{33,33}},
 43                {{3,3},{33,33},{333,333}}
 44             };
 45             console.writeline("多维数组");
 46             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]);
 47             console.writeline("{0},{1},{2},{3}", intarray1[1, 0, 0], intarray1[1, 0, 1], intarray1[1, 1, 0], intarray1[1, 1, 1]);
 48             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]);
 49 
 50             //4交错数组即数组的数组
 51             int[][] intarray2 = new int[4][];
 52             intarray2[0] = new int[] { 1 };
 53             intarray2[1] = new int[] { 2, 22 };
 54             intarray2[2] = new int[] { 3, 33, 333 };
 55             intarray2[3] = new int[] { 4, 44, 444, 4444 };
 56             console.writeline("交错数组");
 57             for (int i = 0; i < intarray2.length; i++)
 58             {
 59                 for (int j = 0; j < intarray2[i].length; j++)
 60                 {
 61                     console.writeline("{0}", intarray2[i][j]);
 62                 }
 63             }
 64             console.readkey();
 65             int[] myintarray = new int[5] { 1, 2, 3, 4, 5 };
 66             object[] myobjarray = new object[5] { 26, 27, 28, 29, 30 };
 67             console.writeline("initially,");
 68             console.write("integer array:");
 69             printvalues(myintarray);
 70             console.write("object array: ");
 71             printvalues(myobjarray);
 72 
 73             system.array.copy(myintarray, myobjarray, 2);
 74 
 75             console.writeline("\n after copying the first two elements of the integer array to the object array.");
 76             console.write("integer array:");
 77             printvalues(myintarray);
 78             console.write("object array: ");
 79             printvalues(myobjarray);
 80 
 81             system.array.copy(myobjarray, myobjarray.getupperbound(0) - 1, myintarray, myintarray.getupperbound(0) - 1, 2);
 82 
 83             console.writeline("\nafter copying the last two elements of the object array to the integer array,");
 84             console.write("integer array:");
 85             printvalues(myintarray);
 86             console.write("object array:");
 87             printvalues(myobjarray);
 88             console.readkey();
 89         }
 90 
 91         public static void printvalues(object[] myarr)
 92         {
 93             foreach (object i in myarr)
 94             {
 95                 console.write("\t{0}", i);
 96             }
 97             console.writeline();
 98         }
 99 
100         public static void printvalues(int[] myarr)
101         {
102             foreach (int i in myarr)
103             {
104                 console.write("\t{0}", i);
105             }
106             console.writeline();
107         }
108     }
109 }

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？