使用数组2

时间：2010-09-26 来源：草珊瑚

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。

代码 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();
        }
    }


}

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