C# 字符串、数组和List的截取和转换实例

如下所示：

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();
   }
 }

}

来源：http://www.cnblogs.com/sanday/archive/2017/11/21/7873440.html