C # Action String method Summary < Go >

Staticvoid Main (string[] args) {            strings =""; //(1) Character access (subscript access s[i])s ="ABCD"; Console.WriteLine (s[0]);//output "A";Console.WriteLine (s.length);//Output 4Console.WriteLine (); //(2) break into character array (ToCharArray)s ="ABCD"; Char[] arr = S.tochararray ();//break the string into character array {' A ', ' B ', ' C ', ' D '}Console.WriteLine (arr[0]);//The first element of the output array, output "A"Console.WriteLine (); //(3) Intercept sub-string (Substring)s ="ABCD"; Console.WriteLine (S.substring (1));//start at 2nd bit (index starting from 0) intercept until end of string, output "BCD"Console.WriteLine (S.substring (1,2));//2 bits starting from 2nd bit, output "BC"Console.WriteLine (); //(4) matching index (IndexOf ())s ="ABCABCD"; Console.WriteLine (S.indexof ('A'));//search for the first matching character A's position index from the beginning of the string, output "0"Console.WriteLine (S.indexof ("BCD"));//Search the position of the first matching string BCD from the beginning of the string, output "4"Console.WriteLine (S.lastindexof ('C'));//search for the position of the first match character C from the end of the string, output "5"Console.WriteLine (S.lastindexof ("AB"));//Search from the end of the string for the position of the first matching string bcd, Output "3"Console.WriteLine (S.indexof ('E'));//The position of the first matched string e is searched from the beginning of the string, with no matching output "1";Console.WriteLine (S.contains ("ABCD"));//determines if another string "ABCD" is present in the string, outputting trueConsole.WriteLine (); //(5) Case conversion (ToUpper and ToLower)s ="ABcD"; Console.WriteLine (S.tolower ()); //convert to lowercase, output "ABCD"Console.WriteLine (S.toupper ());//convert to uppercase, output "ABCD"Console.WriteLine (); //(6) Fill alignment (PadLeft and PadRight)s ="ABCD"; Console.WriteLine (S.padleft (6,'_'));//fill the left part of the string with ' _ ' to extend it to 6-bit total length, output "__ABCD"Console.WriteLine (S.padright (6,'_'));//fill the right part of the string with ' _ ' to extend it to 6-bit total length, output "abcd__"Console.WriteLine (); //(7) Cutting head to Tail (Trim)s ="__ab__cd__"; Console.WriteLine (S.trim ('_'));//Remove the ' _ ' character from the string in the header and tail, output "AB__CD"Console.WriteLine (S.trimstart ('_'));//Remove the ' _ ' character of the header in the string and output "ab__cd__"Console.WriteLine (S.trimend ('_'));//Remove the trailing ' _ ' character from the string and output "__AB__CD"Console.WriteLine (); //(8) inserting and removing (insert and remove)s ="adef"; Console.WriteLine (S.insert (1,"BC"));//Insert the string "BC" in the 2nd place of the string, output "ABCDEF"Console.WriteLine (s); Console.WriteLine (S.remove (1));//from the beginning of the 2nd bit of the string to the last character is deleted, output "A"Console.WriteLine (s); Console.WriteLine (S.remove (0,2));//Remove 2 characters from the 1th bit of the string, output "EF"Console.WriteLine (); //(9) Replacement character (string) (replace)s ="a_b_c_d"; Console.WriteLine (S.replace ('_','-'));//Replace the ' _ ' character in the string with '-' and output ' a-b-c-d 'Console.WriteLine (S.replace ("_",""));//Replace "_" in the string with an empty string, output "A B C D"Console.WriteLine (); //(10) split into a string array (split)--reciprocal operation: union A string static method join (seperator,arr[])s ="AA,BB,CC,DD"; string[] arr1 = S.split (',');//splits a string with ', ' characters, returns an array of stringsConsole.WriteLine (arr1[0]);//output "AA"Console.WriteLine (arr1[1]);//output "BB"Console.WriteLine (arr1[2]);//output "CC"Console.WriteLine (arr1[3]);//output "DD"Console.WriteLine (); S="AA--BB--CC--DD"; string[] arr2 = S.replace ("--","-"). Split ('-');//tips for splitting with strings: first replace the string "--" with a single character "-" and then split the string with the '-' character to return an array of stringsConsole.WriteLine (arr2[0]);//output "AA"Console.WriteLine (arr2[1]);//output "BB"Console.WriteLine (arr2[2]);//output "CC"Console.WriteLine (arr2[3]);//output "DD"Console.WriteLine (); //(11) Formatting (static method format)Console.WriteLine (string. Format ("{0} + {1} = {2}",1,2,1+2)); Console.WriteLine (string. Format ("{0}/{1} = {2:0.000}",1,3,1.00/3.00)); Console.WriteLine (string. Format ("{0:yyyy mm month DD Day}", DateTime.Now)); //(12) concatenate into a string (static method Concat, static method join, and instance method Stringbuilder.append)s ="a,b,c,d"; string[] Arr3 = S.split (',');//arr = {"A", "B", "C", "D"}Console.WriteLine (string. Concat (ARR3));//concatenate a string array into a string that outputs "ABCD"Console.WriteLine (string. Join (",", ARR3));//concatenate a string array into a string with "," as a split symbol, output "a,b,c,d"StringBuilder SB=NewStringBuilder ();//declares a string constructor instanceSb. Append ("A");//using string constructors to connect strings for higher performanceSb. Append ('B'); Console.WriteLine (sb.) ToString ());//output "AB"Console.readkey (); }

C # Action String method Summary < forwarding;