标签：cin lead class names pad ble index 字符串的操作 eem
1用Reverse方法反转一个字符串
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string funnyMan = "Roscoe Arbuckle";string backwardsGuy = new string(funnyMan.Reverse().ToArray());//backwardsGuy="elkcubrA eocsoR"; |
2. 使用String.Split把字符串分割成子字符串
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string names = "John,Mary,Elvis,Ringo";//names = "John,Mary,Elvis,Ringo?I‘m fine";//Split参数是数组，所以可以多个字符作为分隔符string[] nameList = names.Split(new char[] { ‘,‘});//new char[] { ‘,‘,‘?‘,‘\‘‘,‘ ‘}Console.WriteLine(nameList[0]); // JohnConsole.WriteLine(nameList[1]); // MaryConsole.WriteLine(nameList[2]); // ElvisConsole.WriteLine(nameList[3]); // Ringo |
也可以使用循环来遍历string数组
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string names = "John - Mary - Elvis - Ringo";// Same result as before - we get four names, without spaces or dashstring[] nameList = names.Split(new string[] { " - " },StringSplitOptions.RemoveEmptyEntries);foreach (string str in nameList){Console.WriteLine(str);} |
参数指定移除空格
3.字符串函数连在一起操作
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char[] braces = new char[] { ‘{‘, ‘}‘ };string s = "{This|That|Such}";s = s.Replace("|", " and ").Trim(braces).Insert(0, "=> ").ToLower();Console.WriteLine(s); // => this and that and such |
可以将操作的字符串的函数在一行中实现
4. 通过Trim方法在字符串中减少前导和尾随字符
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string s = " The core phrase"; // 2 leading spaces, 1 trailings = s.Trim(); // s = "The core phrase" |
注意：(1)Trim()方法默认只是去掉开头和结尾的空格，不会去掉字符串中间的空格。
(2)任何对字符串的操作，都不改变原字符串的值，都会返回一个新的实例，需要赋值给一个变量，才能得到对字符串操作结果的字符串。
也可以给Trim()方法附加参数，指定要截去的字符
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string s = " {The core phrase,} ";s = s.Trim(new char[] { ‘ ‘, ‘{‘, ‘,‘, ‘}‘ });// s = "The core phrase"s = " {Doesn‘t {trim} internal stuff }";s = s.Trim(new char[] { ‘ ‘, ‘{‘, ‘}‘ });// s = "Doesn‘t {trim} internal stuff" |
也可以通过TrimStart和 TrimEnd方法截去字符串的开头和结尾
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string s = "{Name}";char[] braces = new char[] { ‘{‘, ‘}‘ };string s2 = s.TrimStart(braces); // s2 = "Name}"string s3 = s.TrimEnd(braces); // s3 = "{Name" |
可以通过String.Insert方法在一个字符串的任何位置插入一个子字符串。
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string s = "John Adams";int n = s.IndexOf("Adams");s = s.Insert(n, "Quincy "); // s now "John Quincy Adams" |
注意：字符串时不可变的，即使调用Insert方法，如果未把操作的结果赋给任何变量，对原字符串没有任何影响。
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string s = "John Adams";s.Insert(5, "Quincy "); // Allowed, but s is not changed |
可以通过String.Remove方法指定下标开始，指定长度的子字符串，字符串的下标从0开始。
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string s = "OHOLEne";s = s.Remove(1, 4); // Start at position 1, remove 4 characte |
标签：cin lead class names pad ble index 字符串的操作 eem
原文地址：https://www.cnblogs.com/hzy-bk-520/p/13226143.html
