使用数组2

使用数组>查找数组>BinarySearch二进制搜索

BinarySearch找到匹配的元素值，返回指定元素的索引。找不到，返回一个负值。

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //查找数组>BinarySearch二进制搜索
            string[] csharpBooks = new string[3];
            csharpBooks[0] = "book1";
            csharpBooks[1] = "book3";
            csharpBooks[2] = "book2";

            Array.Sort(csharpBooks);//BinarySearch要求搜寻的数组必须先排序，并且按升序排序。数组中的每个元素要实现IComparable接口
            foreach (string csharpBook in csharpBooks)
            {
                Console.WriteLine(csharpBook);
            }

            Console.WriteLine("使用二分算法搜寻数组元素值book2:");

            object searchBook = "book2";

            int searchResult = Array.BinarySearch(csharpBooks, searchBook);
            if (searchResult < 0)
            {
                Console.WriteLine("搜寻数组元素值{0},没有找到！", searchBook);
            }
            else
            {
                Console.WriteLine("搜寻数组元素值{0},已找到，在索引位置{1}", searchBook, searchResult);
            }
            Console.ReadLine();
        }
    }

   
}

 使用数组>查找数组>Find搜索和IndexOf搜索

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //查找数组>Find搜索
            string[] csharpBooks = { "book1", "book2", "book3", "book4", "book5" };
            //传递一个数组和一个委托到Find方法，Find方法将以每个数组元素为参数调用GetSharpBook方法
            string firstCsharpBooks = Array.Find<string>(csharpBooks, GetCSharpBook);
            //如果找到就定位到第一个元素。
            Console.WriteLine("找到了数组元素值为{0}的数组元素", firstCsharpBooks);
            //Console.ReadLine();

            //-------------------------------------------------
            //查找数组>indexOf搜索
            Array IndexOfcsharpBooks = Array.CreateInstance(typeof(string), 6);
            IndexOfcsharpBooks.SetValue("book1", 0);
            IndexOfcsharpBooks.SetValue("book2", 1);
            IndexOfcsharpBooks.SetValue("book3", 2);
            IndexOfcsharpBooks.SetValue("book4", 3);
            IndexOfcsharpBooks.SetValue("book5", 4);
            IndexOfcsharpBooks.SetValue("book6", 5);

            string csharpBook = "book5";
            int searchResultIndex = Array.IndexOf(IndexOfcsharpBooks, csharpBook);
            Console.WriteLine("{0}在IndexOfcsharpBooks数组中首次出现的位置是{1}", csharpBook, searchResultIndex);

        }

        //定义一个执行查找元素的方法
        private static bool GetCSharpBook(string csharpbook)
        {
            if (csharpbook == "book2")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }

   
}

使用数组>反转数组

何谓反转数组，就是123木头人，变成人头木321。

 

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] csharpBooks = { "book1", "book2", "book5", "book7", "book8", "book9" };
            Console.WriteLine("在没有调用Reverse的数组顺序为：");
            printArray(csharpBooks);
            //调用Array.Reverse反转数组的顺序
            Array.Reverse(csharpBooks);
            Console.WriteLine("调用Reverse方法后的数组顺序为：");
            printArray(csharpBooks);
            Console.ReadLine();
        }

        static void printArray(string[] array)
        {
            foreach (string element in array)
            {
                Console.WriteLine(element);
            }
        }
    }

   
}

使用数组>复制数组

有两种方法，System.Array.Copy是静态方法，System.Array.Copyto是实例方法。都可以将一个数组的一部分元素复制到另外一个数组中。

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

namespace CopyArray
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] csharpBooks ={ "book1", "book2", "book5", "book7", "book8", "book9" };
            string[] csharpBooks2=new string[csharpBooks.Length];
            string[] csharpBooks3 = new string[csharpBooks.Length];
            Console.WriteLine("源数组的内容为:");
            PrintArray(csharpBooks);
            //使用Copy复制数组
            Array.Copy(csharpBooks, csharpBooks2, 4);            
            Console.WriteLine("使用copy方法复制到的数组内容为:");
            PrintArray(csharpBooks2);
            //使用Copyto复制数组
            csharpBooks.CopyTo(csharpBooks3,0);
            Console.WriteLine("使用copyTo方法复制到的数组内容为:");
            PrintArray(csharpBooks3);
            Console.ReadLine();
        }
        static void PrintArray(string[] array)
        {
            foreach (string element in array)
            {
                Console.WriteLine(element);
            }
        }
    }
}

 使用数组>复制数组

这个我也有点看不明白，代码还是先放上吧。运行时才检测数组元素的类型以及数组长度。

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

namespace DynamicCreateInstance
{
    class Program
    {
        static void Main(string[] args)
        {
            //动态创建一个5个元素的一维string数组
            Array csharpBooks = Array.CreateInstance(typeof(string), 5);
            for (int i = 0; i <= csharpBooks.GetUpperBound(0); i++)
            {
                csharpBooks.SetValue("book" + (i+1), i);
            }
            foreach (string csharpbook in csharpBooks)
            {
                Console.WriteLine(csharpbook);
            }
            Console.ReadLine();
        }
    }
}