C#中String类的简单应用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace String类àà
{
class Program
{
static void Main(string[] args)
{
string str1 = "this is my first test about Strnig";
string str2 = "this is the second test";
Console.WriteLine("========================string 类中compare的应用==================");
Console.WriteLine("str1和str2分别是" + str1 + "    " + str2);
Console.WriteLine("str1与str2比较的结果是: " + str1.CompareTo(str2));
Console.WriteLine("str1的长度" + str1.Length);
Console.WriteLine("=======================string中contains的用ó?法·¨=====================");
string str3 = "written by majianjie";
string str4 = "written by majianjie too";
Console.WriteLine("str3和oístr4测的结果是：" + str4.Contains(str3));
Console.WriteLine("=======================string 中equals的用法·¨======================");
string str5 = str4;
Console.WriteLine("equals比较的结果是： " + str4.Equals(str5));
Console.WriteLine("=======================string中copyto的用法·¨========================");
string str6 = "majianjiemajianjiemajianjie";
char[] ch1 = new char[str6.Length];
str6.CopyTo(0, ch1, 0, 5);
foreach (char ontChar in ch1)
{
Console.Write("{0}", ontChar);
}
Console.WriteLine();
Console.WriteLine("========================string中Dstart的用法·¨===================================");
string str7 = "my name is majianjie, i am in qinhuangdao, shagndaxue...oo, shit!!";
Console.WriteLine("str7字符串是: "+str7);
Console.WriteLine("判D断是否以\"my\"开a始的" + str7.StartsWith("my") + "   和是否以\"!!\"结束的  " + str7.EndsWith("!!"));
Console.WriteLine("========================string 中Dindex的用法·¨=======================");
Console.WriteLine("str7中D\"am\"出现的为a位置是: " + str7.IndexOf("m") + "   str7中D\"qinhuangdao\"第1次出现的位置?: " + str7.LastIndexOf("qinhuangdao"));
Console.WriteLine("===================string 中indexofany的用法和lastindexofany的用法·¨===============");
Console.WriteLine("str7 的长度是: "+str7.Length);
char[] ch = { 'q','i'};
int a = str7.IndexOfAny(ch);                //最早出现q或者i的位置
Console.WriteLine("indexofany  q i  :"+a);
char[] ch2 = { 'i','t'};
int b = str7.LastIndexOfAny(ch2);           //最后出现i或者t的位置
Console.WriteLine("lastindexofany  i  t    :"+b);
Console.WriteLine("===============string中substring的用法·¨=============================");
Console.WriteLine(str7.Substring(64));
Console.WriteLine(str7.Substring(60,6));
Console.WriteLine("=================string中拆分字符串的用法·¨===========================");
string chaifen = "majianjie1:22|majianjie2:23|majianjie3:24|majianjie4:25";
Console.WriteLine(chaifen);
Console.WriteLine();
//string x = "\\|";
string[] result1=chaifen.Split(("\\|").ToCharArray());
for (int i = 0; i < result1.Length;i++ )
{
Console.WriteLine(result1[i]);
}
Console.WriteLine();
for (int i = 0; i < result1.Length; i++)
{
string[] result2 = result1[i].Split((":".ToCharArray()));
Console.WriteLine(result2[0]+"-->"+result2[1]);
}
Console.WriteLine("================string中replace的用法·¨====================");
Console.WriteLine(chaifen.Replace("jie","kang"));
Console.WriteLine();
Console.WriteLine("============string中DTrim--trimstart--Trimend--toupper--tolower的用法·¨===============");
string str8 = "    ma  jiaNjIe  M ma  JiANjie  MAJIAN JiE ie    ";
Console.WriteLine("原型:   "+str8);
Console.WriteLine(str8.ToLower());
Console.WriteLine(str8.ToUpper());
Console.WriteLine(str8.Trim());
Console.WriteLine(str8.TrimEnd());
Console.WriteLine(str8.TrimStart());
Console.WriteLine("=======================StringBuffer的用法·¨=========================");
StringBuilder sb = new StringBuilder();
sb.Append("this is my first test");
sb.Append("11111111111111");
Console.WriteLine(sb);
Console.WriteLine("=======================AppendFormat的用法·¨=========================");
StringBuilder strBu = new StringBuilder();
strBu.AppendFormat("111 {0} {1}", '\n', DateTime.Now.ToString("HH:mm:ss"));

Console.WriteLine(strBu);
string []value={"1","2","3"};
string c="";
StringBuilder str10=new StringBuilder();
foreach(string text in value)
{
str10.AppendFormat(",{0}", text);   //将value数组中的值拼接成一个字符串，以逗号分隔
}
if(str10!=null&&str10.Length>0)
{
str10.Remove(0,1);//移除第一个逗号
}
c=str10.ToString();
Console.WriteLine(c);
Console.ReadLine();
}
}
}