c# 数组操作

using System;  
using System.Collections.Generic;  
using System.Text;  
 
namespace ClassAboutArray  
{  
public class CreateArray  
{  
/// <summary> 
/// 一维数组的定义  
/// </summary> 
public void testArr1()  
{  
int[] myIntArr = new int[100];  
//定义一个长度为100的int数组  
string[] mystringArr = new string[100];  
//定义一个长度为100的string数组  
object[] myObjectArr = new object[100];  
//定义一个长度为100的int数组  
 
int[] myIntArr2 = new int[] { 1, 2, 3 };   
//定义一个int数组，长度为3  
string[] mystringArr2 = new string[] { "油", "盐" };  
//定义一个string数组，长度为2  
}  
 
/// <summary> 
/// 多维数组的定义  
/// </summary> 
public void testArr2()  
{  
int[,] myIntArr = new int[10, 100];   
//定义一个10*100的二维int数组  
string[, ,] mystringArr = new string[2, 2, 3];   
//定义一个2*2*3的三维string数组   
 
int[,] myIntArr2 = new int[,] { { 1, 2, 3 }, { -1, -2, -3 } };  
//定义一个2*3的二维int数组，并初始化  
string[,] mystringArr2 = new string[,] { { "油", "盐" }, { "《围城》", "《晨露》" } };  
//定义一个2*2的二维string数组，并初始化  
}  
 
/// <summary> 
/// 交错数组的定义  
/// </summary> 
public void testArr3()  
{  
int[][] myJaggedArray = new int[3][];  
myJaggedArray[0] = new int[5];  
myJaggedArray[1] = new int[4];  
myJaggedArray[2] = new int[2];  
 
int[][] myJaggedArray2 = new int[][]  
 {  
new int[] {1,3,5,7,9},  
new int[] {0,2,4,6},  
new int[] {11,22}  
 };  
}  
}  
 
public class TraverseArray  
{  
/// <summary> 
/// 使用GetLowerBound|GetUpperBound遍历数组  
/// </summary> 
public void test1()  
{  
//定义二维数组  
string[,] myStrArr2 = new string[,] 
{ { "油", "盐" }, { "《围城》", "《晨露》" }, { "毛毛熊", "Snoopy" } };  
//循环输出  
for (int i = myStrArr2.GetLowerBound(0); i <= myStrArr2.GetUpperBound(0); i++)  
{  
Console.WriteLine("item{0}", i);  
for (int j = myStrArr2.GetLowerBound(1); j <= myStrArr2.GetUpperBound(1); j++)  
{  
Console.WriteLine(" item{0}{1}:{2}", i, j, myStrArr2.GetValue(i, j));  
}  
}  
}  
 
/// <summary> 
/// 使用foreach遍历数组  
/// </summary> 
public void test2()  
{  
//定义二维数组  
string[,] myStrArr2 = new string[,] 
{ { "油", "盐" }, { "《围城》", "《晨露》" }, { "毛毛熊", "Snoopy" } };  
//循环输出  
foreach (string item in myStrArr2)  
{  
{  
Console.WriteLine("{0}", item);  
}  
}  
}  
}  
 
public class SortArray  
{  
/// <summary> 
/// 利用Sort方法进行数组排序  
/// </summary> 
public void test1()  
{  
//定义数组  
int[] myArr = { 5, 4, 3, 2, 1 };  
 
//输出原始数组：原始数组:5->4->3->2->1-> 
Console.WriteLine("原始数组:");  
for (int i = 0; i < myArr.Length; i++)  
Console.Write("{0}->", myArr[i]);  
Console.WriteLine();  
 
//对数组排序  
Array.Sort(myArr);  
 
//并输出排序后的数组：1->2->3->4->5-> 
Console.WriteLine("排序以后数组:");  
for (int i = 0; i < myArr.Length; i++)  
Console.Write("{0}->", myArr[i]);  
}  
 
/// <summary> 
/// 多个数组的关键字排序  
/// </summary> 
public void test2()  
{  
//定义数组  
int[] arrSid = { 5, 4, 3, 2, 1 };  
string[] arrSname = { "张三", "李四", "王五", "麻子", "淘气" };  
 
//输出原始数组：原始数组:张三(5)->李四(4)->王五(3)->麻子(2)->淘气(1)-> 
Console.WriteLine("原始数组:");  
for (int i = 0; i < arrSid.Length; i++)  
Console.Write("{0}({1})->", arrSname[i], arrSid[i]);  
Console.WriteLine();  
 
//根据学号关键字排序  
Array.Sort(arrSid, arrSname);  
 
//并输出排序后的数组：淘气(1)->麻子(2)->王五(3)->李四(4)->张三(5)  
Console.WriteLine("排序以后数组:");  
for (int i = 0; i < arrSid.Length; i++)  
Console.Write("{0}({1})->", arrSname[i], arrSid[i]);  
}  
}  
 
public class SearchArray  
{  
/// <summary> 
/// 利用BinarySearch方法搜索元素  
/// </summary> 
public void test1()  
{  
//定义数组  
int[] myArr = { 5, 4, 3, 2, 1 };  
 
//对数组排序  
Array.Sort(myArr);  
 
//搜索  
int target = 3;  
int result = Array.BinarySearch(myArr, target); //2  
Console.WriteLine("{0}的下标为{1}", target, result); //2  
}  
 
/// <summary> 
/// 判断是否包含某个值  
/// </summary> 
public void test2()  
{  
//定义数组  
string[] arrSname = { "张三", "李四", "王五", "麻子", "淘气" };  
 
//判断是否含有某值  
string target = "王五";  
bool result = ((System.Collections.IList)arrSname).Contains(target);  
Console.WriteLine("包含{0}?{1}", target, result); //true  
}  
}  
 
public class ReverseArray  
{  
/// <summary> 
/// 利用Reverse方法反转数组  
/// </summary> 
public void test1()  
{  
//定义数组  
int[] myArr = { 5, 4, 3, 2, 1 };  
 
//输出原始数组：原始数组:5->4->3->2->1-> 
Console.WriteLine("原始数组:");  
for (int i = 0; i < myArr.Length; i++)  
Console.Write("{0}->", myArr[i]);  
Console.WriteLine();  
 
//对数组反转  
Array.Reverse(myArr);  
 
//并输出反转后的数组：1->2->3->4->5-> 
Console.WriteLine("反转以后数组:");  
for (int i = 0; i < myArr.Length; i++)  
Console.Write("{0}->", myArr[i]);  
}  
}  
 
public class CopyArray  
{  
/// <summary> 
/// 利用Copy静态方法复制数组  
/// </summary> 
public void test1()  
{  
//定义数组  
int[] myArr = { 5, 4, 3, 2, 1 };  
 
//输出原始数组：原始数组:5->4->3->2->1-> 
Console.WriteLine("原始数组:");  
for (int i = 0; i < myArr.Length; i++)  
Console.Write("{0}->", myArr[i]);  
Console.WriteLine();  
 
//复制数组  
int[] newnewArr = new int[3];  
Array.Copy(myArr, newArr, 3);  
 
//并输出反复制的数组：5->4->3-> 
Console.WriteLine("复制数组:");  
for (int i = 0; i < newArr.Length; i++)  
Console.Write("{0}->", newArr[i]);  
}  
 
/// <summary> 
/// 利用CopyTo实例方法复制数组  
/// </summary> 
public void test2()  
{  
//定义数组  
int[] myArr = { 5, 4, 3, 2, 1 };  
 
//输出原始数组：原始数组:5->4->3->2->1-> 
Console.WriteLine("原始数组:");  
for (int i = 0; i < myArr.Length; i++)  
Console.Write("{0}->", myArr[i]);  
Console.WriteLine();  
 
//复制数组  
int[] newnewArr = new int[7];  
myArr.CopyTo(newArr, 2);  
 
//并输出反复制的数组：0->0->5->4->3->2->1-> 
Console.WriteLine("复制数组:");  
for (int i = 0; i < newArr.Length; i++)  
Console.Write("{0}->", newArr[i]);  
}  
}  
 
public class DynamicCreateArray  
{  
/// <summary> 
/// 利用CreateInstance动态创建数组  
/// </summary> 
public void test1()  
{  
//定义长度数组  
int[] lengthsArr = new int[] { 3, 4 };  
int[] lowerBoundsArr = { 1, 11 };  
 
Array arr = Array.CreateInstance(Type.GetType("System.Int32"), lengthsArr, lowerBoundsArr);  
 
Random r = new Random(); //声明一个随机数对象  
//循环赋值、输出  
for (int i = arr.GetLowerBound(0) - 1; i < arr.GetUpperBound(0) - 1; i++)  
{  
for (int j = arr.GetLowerBound(1) - 1; j < arr.GetUpperBound(1) - 1; j++)  
{  
arr.SetValue((int)r.Next() % 100, i, j);//用1～100的随即数赋值  
Console.WriteLine("arr[{0},{1}]={3}", i, j, arr.GetValue(i, j));  
}  
}  
}  
}  
}