. Net C # string learning Summary

In the past, I used to forward others' posts. Today I am sending my study notes:
(1) compare strings
Compareto:
Str1.compareto (str2); returns int
If str1 is longer than str2, return 1. If str2 is longer than str1, return-1.
If the values are equal, 0 is returned.
Equals:
Str1.equals (str2); Return bool
Returns true if str1 is equal to str2; otherwise, returns false.
(2) Positioning characters
Int I = str1.indexof (str2 );
Find the character or substring str2 in str1 and return the index count starting from "0 ".
(3) format the string
Format: format any numeric enumeration date as a string of a specific format
Syntax: public static string format (string format, object ARGO );
The first parameter is: format. The second parameter is the object to be formatted.
I understand it as a user-defined format for data processing.
(4) Intercepting substrings
Substring:
Syntax: Public string substring (INT first, int length );
The index intercepts the length of the substring from first.
(5) separator string
Split:
Syntax: Public String [] Split (char [] SEP );
Splits a string into a string group by using parameters as the separator.
For example:
Str1 = '1 | 2 | 3 | 4 | 5 ";
String [] idnum = str1.split ('| ');
(6) Insert a string
Syntax: Public String insert (INT index, string value );
Here, index is the index location to be inserted, and value is the substring to be inserted.
(7) Fill in the string
Syntax: Public String padleft (INT total, char padchar );
It indicates filling the character padchar on the left side of the string to make the total length after filling into total. Note: it is the length after filling.
Similarly, you can also fill in the right, padright
(8) delete strings and substrings
Syntax: Public String remove (INT index, int count );
Str1.remove (5, 9 );
From str1, from index 5, 9 characters after deletion. In syntax, index is the index of the characters to be deleted, and count is the number of characters to be deleted.
(9) Remove a string
Syntax: Public String trimstart (char [] trimchars );
Str1.trimstart ('% ','#');
That is, from the 0 index position of str1, the characters % and # are deleted backward. If the next character is not % and #, it is stopped.
(10) copy a string
Needless to say, Public String Copy (string to be copied );
(11) Replacing strings
Syntax: Public String Replace (string old, string new );
In the parameter, old is the substring to be replaced, and new is the substring to be replaced.

I hope it will be helpful and helpful to everyone.