asp.net C # common string manipulation functions

In C # There is a type that directly represents a string, a string type, and he is a collection of char characters, like a system array of char types

The. NET framework supports powerful processing of strings, such as finding, replacing, formatting, adjusting, etc.

String can be spliced with + to connect 2 strings

Traversal string

Can traverse a string like an array

The code is as follows	Copy Code
String thestring = "Hello,world"; Char Thefristchar = thestringp[0];

Characters are read-only and cannot be modified for individual characters

The code is as follows	Copy Code
String thestring = "Hello,world"; Thestring[0] = ' s ';//wrong

Like an array, you can get the length of a string with length

You can iterate over a string with foreach

The code is as follows	Copy Code
String thestring = "Hi,world"; foreach (char s in thestring) { Console.Write (s); }

A character array representing a string can be obtained through the ToCharArray () Form

The code is as follows	Copy Code
string thestring = "Hello World"; char[] Thechars = Thestring.tochararray ();

Trim goes to the 2-head space, TrimStart to the specified string at the beginning, trimend the specified string to the end

The code is as follows	Copy Code
string s = "aaasssddd"; string S1 = "ASASASDDD"; Console.WriteLine (S.trimstart (new char[] {' A ', ' s '})); Ddd. Console.WriteLine (S1. TrimStart (new char[] {' A ', ' s '}); Sasasddd.

PadLeft or padright Add the specified characters at the beginning and end

The code is as follows	Copy Code
string s = "12345"; Console.WriteLine (S.padleft, ' V ')); vvvvv12345 string s = "12345"; Console.WriteLine (S.padleft (5, ' V ')); 12345 string s = "12345"; Console.WriteLine (S.padleft (3, ' V ')); 12345

Split splits the string into a string fragment by the specified character, resulting in an array of strings

The code is as follows	Copy Code
String str = "one Two_three=four"; string[] arr = str. Split (new char[] {', ' _ ', ' = '}); foreach (string s in arr) { Console.WriteLine (s); }

Substring can get the specified position to the end of the string fragment the first argument is the start position 2nd is the length of the Intercept string

The code is as follows	Copy Code
String str= "0123456789"; string newstr = str. Substring (3); Console.WriteLine (NEWSTR); string newStr2 = str. Substring (3,1); Console.WriteLine (NEWSTR2);

Repalce the string specified by the replacement string

The code is as follows	Copy Code
String str = "ASDASDZXC"; Console.WriteLine (str. Replace (' A ', ' 1 '));

Remove deletes the string fragment at the specified position in the string the first argument is the position the 2nd parameter is the length

The code is as follows	Copy Code
String str = "0123456789"; Console.WriteLine (str. Remove (5)); Console.WriteLine (str. Remove (5,1));

IndexOf find the specified string position in the string, the first argument is the string to find the 2nd parameter start position

The code is as follows	Copy Code
String str = "OK is OK"; Console.WriteLine (str. IndexOf ("OK")); Console.WriteLine (str. IndexOf ("OK", 1));