高级程序设计C#第八章.pptVIP

static void Main(string[] args) { string s1 = helloworld!; Console.WriteLine(s1={0}, s1); string s2 = new string(a, 5); Console.WriteLine(s2={0}, s2); char[] s3=new char[]{m,i,c,r,o,s,o,f,t}; string s4 = new string(s3); string s5 = new string(s3,1,4); Console.WriteLine(s3={0}, s3); Console.WriteLine(s4={0}, s4); Console.WriteLine(s5={0}, s5); Console.ReadLine(); } static void Main(string[] args) { string s1 = Microsoft!; char[] chs1 = s1.ToCharArray(); char[] chs2 = s1.ToCharArray(5, 4); Console.WriteLine(new string(chs1)); Console.WriteLine(new string(chs2)); char[] chs = new char[20]; Microsoft.CopyTo(0,chs,0,9); Windows2003.CopyTo(0, chs, 10, 7); Console.WriteLine(new string(chs)); Console.ReadLine(); } 字符查找 int IndexOf(char) int IndexOf(char,int) int IndexOf(char,int,int) int LastIndexOf(char,int,int) int IndexOfAny(char[]) public class SearchCharSample { static void Main() { bool bFail = true; string sName; char[] illChars = { @, #, $, %, , !, ? }; while (bFail) { Console.Write(请输入用户名:); sName = Console.ReadLine(); if (sName.Length == 0 || !Char.IsLetter(sName[0])) { Console.WriteLine(错误! 用户名必须以字母开头); } else { if (sName.IndexOfAny(illChars) = 0) Console.WriteLine(错误! 用户名中含有非法字符); else bFail = false; } } Console.WriteLine(注册成功!); Console.ReadLine(); } } 练习 输入一个字符串，求其中字符‘e’出现的次数 using System; using System.Collections