字符串（转）

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Text;

using System.Threading;

  

namespace ConsoleApp1

{

  class Program

  {

    /// <summary>

    /// 字符串，数组和List的截取，转换

    /// </summary>

    /// <param name="args"></param>

    static void Main(string[] args)

    {

      string str = "abcdefghij1234567890";

      int i = 4;

      string str1 = str.Substring(0, i);//截取字符串前i位--abcd

      string str2 = str.Remove(i, str.Length - i);//移除字符串i位后面的字符=截取字符串前i位--abcd

      string str3 = str.Remove(0, i);//截取字符串i位之后的字符串--efghij1234567890

      string str4 = str.Substring(i);//截取字符串i位之后的字符串--efghij1234567890

      string str5 = str.Substring(str.Length - i);//截取字符串后i位--7890

      string str6 = str.Remove(0, str.Length - i);//截取字符串后i位--7890

      string str7 = str.Substring(0, str.Length - i);//去掉字符串后i位--abcdefghij123456

      string str8 = str.Remove(str.Length - i, i);//去掉字符串后i位--abcdefghij123456

      string str9 = str.Replace("abc", "ABC");//替换字符串中的字符串--ABCdefghij1234567890

      string str0 = str.ToUpper();//小写字母转换成大写字母--ABCDEFGHIJ1234567890

      string str10 = str0.ToLower();//大写字母转换成小写字母--abcdefghij1234567890

      string str11= str.Substring(str.Length - 1, 1);//截取字符串最后一位--0

      int m = str.IndexOf("cde") + 1;

      int n = str.IndexOf("23");

      string str12 = str.Substring(m, n - m + 2);//截取从开始字符串到结束字符串范围--cdefghij123

      string s = "a,b,c,d,e,f,g,h,i,j";

      string[] strArray = s.Split(','); //字符串转数组

      string str13 = string.Join(",", strArray);//数组转字符串

      List<string> list = new List<string>(s.Split(','));//字符串转List

      string str14 = string.Join(",", list.ToArray());//List转字符串

      string[] str15 = list.ToArray();//List转数组

      List<string> listS = new List<string>(str15);//数组转List

      Console.WriteLine(str0);

      Console.WriteLine(str12);

      Console.ReadLine();

    }

  }

    

}