Manipulation of strings

strings: string non-variability of strings when you re-assign a string, the old value is not destroyed, but a space is re-opened   when the program is finished, the GC scans the entire memory, if you find that some space is not pointed, immediately destroy them we can consider a string type as a read-only group of type char ToCharArray () new String () ToString () ToUpper (): Converts a string to uppercase ToLower (): Convert string to lowercase S1. Equals (S2,stringcomparison.ordinalignorecase): Compares two strings ignoring case S1. Split (new char[]{the character to be split},stringsplitoptions.removeemptyentris) splits the string and removes the empty string refer to Using.system.Text.RegularExpressions first regex.split (str, "JS", regexoptions.ignorecase); Split String string a= "123456789";//Convert to 12-345-6789 A=int. Parse (a). ToString ("##-###-####");   string. Replace ("character to replace", "substituted character") string. SubString (position to start intercept): Intercept string string. SubString (the position to begin interception, the length of interception) contains ("string") to determine whether it contains string.startwith ("string") to determine whether to start with what string.endswith ("string") indexof (' character ') calculates the position of the character at the first occurrence of the string LastIndexOf Find the last occurrence of a character in a string   . Trim () Remove empty items before or after a string  . Rtirm ("1") a string in parentheses   . TrimStart ()   . TrimEnd () followed by an array of type char to move the elements in the divisor group string. IsNullOrEmpty () to determine if it is null or empty string. Join ("delimiter", string[]) joins the array according to the specified string, returning a string   turns a character array into a string. String S=new string (char array); String s=new string (' C ', 5); Gets a string of 5 characters   declares a string, but does not need to assign a value to it string s =null; string s= ""; string s= String. Empty;   simple string manipulation at present the little brother summed up so much, welcome to the Fairy Supplement.

Manipulation of strings