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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