Detailed overview of common string methods in C#

1) Intercept string Use substring method ,

and this method is in c# There are two overloaded functions : substring (parameter), substring (parameter 1, parameter 2),

Usage As follows:

<span style="font-size: 14px;">	string A ="I&#39;m a string";		<br/>	string B=A.substring(1);	    <br/>	string C=A.substring(1,6);</span>

The parameter 1 passed in is the starting position of the string, and character substring B will intercept all characters after the second character of string A. Character substring String C will intercept the string of length 6 after the second character of string A. The parameter must be greater than or equal to 0. If it is less than 0, an ArgumentOutOfRange exception will be thrown.

2) Convert the string into a character array
First of all, the string type variable can be regarded as a read-only array of char variables , so that you can access each character using the following syntax:

string A = "i'm a string"
char B =A[1];

And if you want to turn a string into a writable char array, you can use Tochar Array() method:

char [] = A.Tochararray();

Use B.Length to obtain The length of the string.

##3) Convert case
.ToLower() Convert to lowercase.ToUpper() Convert to uppercase

# #4) Delete spaces or specified characters in the string Delete spaces before and after the string:

<string>.
Trim
()

Delete the specified characters:First use the char array to specify the specific characters

char[] C ={' ','e',}
<string>.Trim(C)

You can also use Trimstart() ,TrimEnd() removes the leading and trailing spaces or specified characters

5) Adds spaces or specified characters # before and after the string ##.PadLeft(parameter) .PadRight(parameter) The parameter is the length of the string after adding spaces .PadLeft(parameter 1 , Parameter 2) Parameter 1 is the length of the string, parameter 2 is the specified character to add.

6)indexof()的用法
IndexOf()
查找字串中指定字符或字串首次出现的位置,返回首索引值，如：

str1.IndexOf("字")； //查找“字”在str1中的索引值（位置）
str1.IndexOf("字串")；//查找“字串”的第一个字符在str1中的索引值（位置）
str1.IndexOf("字",start,end)；//从str1第start+1个字符起，查找end个字符，查找“字”在字符串STR1中的位置

[从第一个字符算起]注意:start+end不能大于str1的长度

7)insert()的用法

<string>.insert(参数1,参数2)

参数1为插入子字符串的其实位置,参数2为要插入的子字符串

8)比较字符串的大小
Compare(str1,str2)——比较两个字符串 str1,str2的大小，如果大于返回正数，等于返回0，小于返回负数

9)替换指定的字符串
String.Replace(参数1,参数2)——用指定的字符替换字符串中的指定字符

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