字符串的处理

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

namespace Ch11Ex02
{
    class Program
    {
        static void Main(string[] args)
        {
            string str1 = "this is a string";
            string str2 = "this";
            Console.WriteLine(string.Compare(str1, str2));//比较大小大于为1，小于为-1，等于为0
            Console.WriteLine(string.Equals(str1, str2));//结果为true和fasce
            Console.WriteLine(str1.IndexOf("is"));//查找
            Console.WriteLine(str1.LastIndexOf("is"));
          
            Console.WriteLine("{0}",  str1.Insert(2, "abc"));//插入
           
            Console.WriteLine("{0}",str1.Remove(2, 3));//删除
           
            Console.WriteLine("{0}", str1.Replace("this", "that"));//替换
            string []str=str1 .Split (' ');//分离
            for (int i=0;i<str .Length ;i++)
            {
                Console .WriteLine (str [i ]);
            }
            char []charArray=str1.ToCharArray (); //复制
            for (int i=0;i<charArray .Length ;i++)
            {
                Console .WriteLine (charArray [i ]);
            }
          
             Console.WriteLine("{0}", str1 .ToUpper ());//转大写

             string str5 = "    this is a book    ";
             string str3 = "     this is a book";
             string str4 = "this a book      ";
            
             Console.WriteLine(str5.Trim());//去空格
            
             Console.WriteLine(str3.TrimStart());
            
             Console.WriteLine(str4.TrimEnd());
             Console.ReadKey();

        }
    }
}