[Summary-basic usage of string and char]

Basic usage of the string class

String is the alias of string, just as Int Is int32 and long is the alias of int64. These structures are derived from the valuetype class.

 

Attribute or Method	Description
Equals ()	Determine whether two string objects are equal
Compareto ()
Startwith (s)	Determines whether a string starts with S.
Endwith (s)	Determines whether a string ends with S.
Gethashcode ()	Obtains the hash value of a string.
Indexof (char)	Index position of the first occurrence of a character (string) in a string
Indexofany (char [])	Index position where the character array appears for the first time in the string
Lastindexof (char)	The last index position of the character (string) in the string
Lastindexofany (char [])	The last index position of the character array in Str
Substring ()	Substring
Replace ()	Replace old characters with new characters
Tolower ()	Converts a specified string to lowercase.
Toupper ()	Converts a specified string to uppercase.
Trim ()	Remove spaces on both sides of the string
Trimend ()	Remove spaces on the right of the string
Trimstart ()	Remove the space on the left of the string.
Tostring ()	Convert to string
Split ()	Splits a string based on a specific character.
Join ()	Connect strings based on specific characters

 

Basic usage of char

Char is of the struct type. Most methods of the char structure are static methods, and at least one character parameter is accepted.

Attribute or Method	Description
Isdigit ()	Determines whether the entered character is a number.
Isletter ()	Determines whether the entered character is a letter.
Islower ()	Determines whether the input character is a lowercase letter.
Isupper ()	Determines whether the input character is an uppercase letter.
Tolower ()	Converts the input characters to lowercase letters.
Toupper ()	Converts the input characters into uppercase letters.
Ispunctuation ()	Determines whether the entered character is a punctuation mark.
Issymbol ()	Determines whether the entered character is a symbol.
Iswhitespace ()	Determines whether the entered character is a blank character (replacement character, tab, space, etc)