效果

代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace ConsoleAppNumberOneHelloWorld
{class Program{static void Main(string[] args){Console.WriteLine("hello world！2020Year！");#region 2 截取字符串方法//string originalString = "Hello, World!";string truncatedString = originalString.Substring(0, 5); // 截取从索引0开始的5个字符;  会获取到Hello内容打印出来； 8.31Console.WriteLine(truncatedString);//截取前6个字符；string sixS = originalString.Substring(0, 6);Console.WriteLine(sixS);//W1string str = "业务为先，代码再写的顺序，才是正确的写代码入门的方式所在，以至于进阶所在！";string waterStr2 = str.Substring(0, 12);Console.WriteLine(waterStr2);#endregionConsole.ReadLine();}}
}