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HomeBackend DevelopmentC#.Net TutorialSummary of methods for operating strings in C#

This article mainly introduces the C# operation string method summary example code. Friends who need it can refer to it

No more nonsense, the specific code is as follows:


staticvoid Main(string[] args)
{
      string s ="";
      //(1)字符访问(下标访问s[i])
      s ="ABCD";
      Console.WriteLine(s[0]); // 输出"A";
      Console.WriteLine(s.Length); // 输出4
      Console.WriteLine();
      //(2)打散为字符数组(ToCharArray)
      s ="ABCD";
      char[] arr = s.ToCharArray(); // 把字符串打散成字符数组{'A','B','C','D'}
      Console.WriteLine(arr[0]); // 输出数组的第一个元素,输出"A"
      Console.WriteLine();
      //(3)截取子串(Substring)
      s ="ABCD";
Console.WriteLine(s.Substring(1)); // 从第2位开始(索引从0开始)截取一直到字符串结束,输出"BCD"
      Console.WriteLine(s.Substring(1, 2)); // 从第2位开始截取2位,输出"BC"
      Console.WriteLine();
      //(4)匹配索引(IndexOf())
      s ="ABCABCD";
      Console.WriteLine(s.IndexOf('A')); // 从字符串头部开始搜索第一个匹配字符A的位置索引,输出"0"
      Console.WriteLine(s.IndexOf("BCD")); // 从字符串头部开始搜索第一个匹配字符串BCD的位置,输出"4"
      Console.WriteLine(s.LastIndexOf('C')); // 从字符串尾部开始搜索第一个匹配字符C的位置,输出"5"
      Console.WriteLine(s.LastIndexOf("AB")); // 从字符串尾部开始搜索第一个匹配字符串BCD的位置,输出"3"
      Console.WriteLine(s.IndexOf('E')); // 从字符串头部开始搜索第一个匹配字符串E的位置,没有匹配输出"-1";
      Console.WriteLine(s.Contains("ABCD")); // 判断字符串中是否存在另一个字符串"ABCD",输出true
      Console.WriteLine();
      //(5)大小写转换(ToUpper和ToLower)
      s ="aBcD";
      Console.WriteLine(s.ToLower()); // 转化为小写,输出"abcd"
      Console.WriteLine(s.ToUpper()); // 转化为大写,输出"ABCD"
      Console.WriteLine();
      //(6)填充对齐(PadLeft和PadRight)
      s ="ABCD";
      Console.WriteLine(s.PadLeft(6, '_')); // 使用'_'填充字符串左部,使它扩充到6位总长度,输出"__ABCD"
      Console.WriteLine(s.PadRight(6, '_')); // 使用'_'填充字符串右部,使它扩充到6位总长度,输出"ABCD__"
      Console.WriteLine();
      //(7)截头去尾(Trim)
      s ="__AB__CD__";
      Console.WriteLine(s.Trim('_')); // 移除字符串中头部和尾部的'_'字符,输出"AB__CD"
      Console.WriteLine(s.TrimStart('_')); // 移除字符串中头部的'_'字符,输出"AB__CD__"
      Console.WriteLine(s.TrimEnd('_')); // 移除字符串中尾部的'_'字符,输出"__AB__CD"
      Console.WriteLine();
      //(8)插入和删除(Insert和Remove)
      s ="ADEF";
      Console.WriteLine(s.Insert(1, "BC")); // 在字符串的第2位处插入字符串"BC",输出"ABCDEF"
      Console.WriteLine(s);
      Console.WriteLine(s.Remove(1)); // 从字符串的第2位开始到最后的字符都删除,输出"A"
      Console.WriteLine(s);
      Console.WriteLine(s.Remove(0, 2)); // 从字符串的第1位开始删除2个字符,输出"EF"
      Console.WriteLine();
      //(9)替换字符(串)(Replace)
      s ="A_B_C_D";
      Console.WriteLine(s.Replace('_', '-')); // 把字符串中的'_'字符替换为'-',输出"A-B-C-D"
      Console.WriteLine(s.Replace("_", "")); // 把字符串中的"_"替换为空字符串,输出"A B C D"
      Console.WriteLine();
      //(10)分割为字符串数组(Split)——互逆操作:联合一个字符串静态方法Join(seperator,arr[])
      s ="AA,BB,CC,DD";
      string[] arr1 = s.Split(','); // 以','字符对字符串进行分割,返回字符串数组
      Console.WriteLine(arr1[0]); // 输出"AA"
      Console.WriteLine(arr1[1]); // 输出"BB"
      Console.WriteLine(arr1[2]); // 输出"CC"
      Console.WriteLine(arr1[3]); // 输出"DD"
      Console.WriteLine();
      s ="AA--BB--CC--DD";
      string[] arr2 = s.Replace("--", "-").Split('-'); // 以字符串进行分割的技巧:先把字符串"--"替换为单个字符"-",然后以'-'字符对字符串进行分割,返回字符串数组
      Console.WriteLine(arr2[0]); // 输出"AA"
      Console.WriteLine(arr2[1]); // 输出"BB"
      Console.WriteLine(arr2[2]); // 输出"CC"
      Console.WriteLine(arr2[3]); // 输出"DD"
      Console.WriteLine();
      //(11)格式化(静态方法Format)
      Console.WriteLine(string.Format("{0} + {1} = {2}", 1, 2, 1+2));
      Console.WriteLine(string.Format("{0} / {1} = {2:0.000}", 1, 3, 1.00/3.00));
      Console.WriteLine(string.Format("{0:yyyy年MM月dd日}", DateTime.Now));
      //(12)连接成一个字符串(静态方法Concat、静态方法Join和实例方法StringBuilder.Append)
      s ="A,B,C,D";
      string[] arr3 = s.Split(','); // arr = {"A","B","C","D"}
      Console.WriteLine(string.Concat(arr3)); // 将一个字符串数组连接成一个字符串,输出"ABCD"
      Console.WriteLine(string.Join(",", arr3)); // 以","作为分割符号将一个字符串数组连接成一个字符串,输出"A,B,C,D"
      StringBuilder sb =new StringBuilder(); // 声明一个字符串构造器实例
      sb.Append("A"); // 使用字符串构造器连接字符串能获得更高的性能
      sb.Append('B');
      Console.WriteLine(sb.ToString());// 输出"AB"
      Console.ReadKey();
    }

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