C#编程--字符串处理

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

    class Program

    {

       

        static void Main(string[] args)

        {

            //字符串处理

            string s = "hello";

            //1,得到字符串的长度

            Console.WriteLine("字符串的长度"+s.Length);

            //2,利用数组操作字符串 只能读不能写 字符串一旦声明 ，不能改变

            Console.WriteLine("第一个字符" + s[0]);

            //3,转换为字符

            char[] arr = s.ToCharArray();

            arr[0] = 'A';

            //4，利用数组构造字符串

            s = new string(arr);

            Console.WriteLine(s);

            //5,字符串转换成小写

            String t = s.ToLower();

            Console.WriteLine(t);

            //6,转换成大写

            t = s.ToUpper();

            Console.WriteLine(t);

            //7,去掉空白两边

            Console.WriteLine(s.Trim());

            //8,字符串的比较

            Console.WriteLine("aello".Equals(s));

            Console.WriteLine("aello".Equals(s, StringComparison.OrdinalIgnoreCase)); //忽略大小写的比较

            Console.WriteLine("Aello" == s); //==区分大小写的比较

            //9,分割字符串

            s = "aaa,bbb,ccc,,   ddd|sdf|dddd|ddd";

            string[] strArr = s.Split(',','|');

            foreach (string temp in strArr)

            {

                Console.WriteLine(temp);

            }

            //             也可以换成字符串的数组

            strArr = s.Split(new char[]{','}, StringSplitOptions.RemoveEmptyEntries) ;//移除空的元素

            foreach(string strtemp in strArr)

            {

                Console.WriteLine(strtemp);

            }

            //10.字符串替换

            s = "11111";

            string temp2 = s.Replace("11", "22");

            Console.WriteLine(temp2);

            //11,字符串截取

            s = "1234567890";

            Console.WriteLine(s.Substring(2));  //从索引2号开始截取

            Console.WriteLine(s.Substring(2,4));  //                           ，截取4个字符

            //12,判断是否含有子川

            Console.WriteLine(s.Contains("345"));

            //13,判断字符串是否以什么开头

            Console.WriteLine(s.StartsWith("123"));

            //s.EndsWith();

            Console.ReadKey();

        }

    }

}

 
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