C#_字符串的操作

   1:  using System;
   2:  using System.Collections.Generic;
   3:  using System.Linq;
   4:  using System.Text;
   5:  using System.Threading.Tasks;
   6:
   7:  namespace FunWithStrings
   8:  {
   9:      class Program
  10:      {
  11:          //基本操作
  12:          static void BasicStringFunctionality()
  13:          {
  14:              Console.WriteLine("Basic String Functionality:");
  15:              string str = "VisualStudio2013";
  16:              Console.WriteLine("Value of str:{0}", str);
  17:              Console.WriteLine("str has {0} characters.", str.Length); //获取长度
  18:              Console.WriteLine("str in uppercase:{0}", str.ToUpper()); //转成大写
  19:              Console.WriteLine("str in lowercase:{0}", str.ToLower()); //转成小写
  20:              Console.WriteLine("str contains the letter 2013 ? :{0}", str.Contains("2013")); //判断是否包含"2013"
  21:              Console.WriteLine("str after replace : {0}",str.Replace("2013","")); //将2013 替换掉
  22:              Console.ReadKey();
  23:          }
  24:          //拼接字符串
  25:          static void StringConcatenation()
  26:          {
  27:              //使用“+”拼接字符串
  28:              Console.WriteLine("String concatenation:");
  29:              string str1 = "字符串";
  30:              string str2 = "拼接";
  31:              string str3 = str1 + str2;
  32:              Console.WriteLine(str3);
  33:              Console.ReadKey();
  34:              //使用String.Concat()拼接
  35:              Console.WriteLine("String concatenation:");
  36:              string str4 = "世界杯";
  37:              string str5 = "比赛";
  38:              string str6 = String.Concat(str4, str5);
  39:              Console.WriteLine(str6);
  40:              Console.ReadKey();
  41:
  42:          }
  43:          //给字符串转义
  44:          static void EscapeChars()
  45:          {
  46:              Console.WriteLine("Escape character:\a");
  47:              string stringWithTabs = "this\tis\ta\tdemo\t!";
  48:              Console.WriteLine(stringWithTabs);
  49:              Console.WriteLine("\"Hello Wolrd!\"");
  50:              Console.WriteLine("C:\\Windows\\System32\\drivers\\etc");
  51:              //使用逐字字符串
  52:              Console.WriteLine(@"D:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7");
  53:              //使用逐字字符串保留空格
  54:              string longString = @"
  55:                                  春江潮水连海平，海上明月共潮生。
  56:                                  滟滟随波千万里，何处春江无月明！
  57:                                  江流宛转绕芳甸，月照花林皆似霰;
  58:                                  空里流霜不觉飞，汀上白沙看不见。
  59:                                  江天一色无纤尘，皎皎空中孤月轮。
  60:                                  江畔何人初见月？江月何年初照人？
  61:                                  人生代代无穷已，江月年年只相似。";
  62:              Console.WriteLine(longString);
  63:              Console.ReadKey();
  64:          }
  65:          //相等性测试
  66:          static void StringWquality()
  67:          {
  68:              Console.WriteLine("字符串相等测试");
  69:              string str1 = "Hello";
  70:              string str2 = "World";
  71:              Console.WriteLine("str1={0}", str1);
  72:              Console.WriteLine("str2={0}", str2);
  73:              Console.WriteLine("str1=str2:{0}", str1 = str2);
  74:              Console.WriteLine("str1=Hello:{0}", str1 == "Hello");
  75:              Console.WriteLine("str1=HELLO:{0}", str1 == "HELLO");
  76:              Console.WriteLine("str1.Equals(str2):{0}", str1.Equals(str2));
  77:              Console.WriteLine("Hello.Equals(str2):{0}", "Hello".Equals(str2));
  78:              Console.ReadKey();
  79:          }
  80:          static void Main(string[] args)
  81:          {
  82:              BasicStringFunctionality();
  83:              StringConcatenation();
  84:              EscapeChars();
  85:              StringWquality();
  86:          }
  87:      }
  88:  }

运行效果