C# | Arrays of Strings - GeeksforGeeks

C# | Arrays of Strings ... declares & initializes string array String[] s1 = new String[2]; // assign the value "Geeks" in array on its ... 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ChangeLanguage DataStructuresAlgorithmsInterviewPreparationTopic-wisePracticeC++JavaPythonCompetitiveProgrammingMachineLearningHTMLSDESheetPuzzlesGFGSchoolProjects RelatedArticles ▲RelatedArticlesC#|HowtogetallelementsofaListthatmatchtheconditionsspecifiedbythepredicateC#|Array.FindAll()MethodC#|Array.Find()MethodC#|String.IndexOf()Method|Set–1C#|Substring()MethodString.Split()MethodinC#withExamplesC#|ArraysofStringsC#|ArraysC#|StackClassC#StackwithExamplesC#QueuewithExamplesLinkedListImplementationinC#C#|LinkedListClassC#|ListClassC#|HowtocheckwhetheraListcontainsaspecifiedelementC#|HowtocheckwhetheraListcontainstheelementsthatmatchthespecifiedconditionsC#|CheckifanarraycontaintheelementsthatmatchthespecifiedconditionsC#|CheckwhetheranelementiscontainedintheArrayListC#|GetorsettheelementatthespecifiedindexinArrayListC#|GetsorSetstheelementatthespecifiedindexintheListC#|IsNullOrEmpty()MethodDifferencebetweenAbstractClassandInterfaceinC#C#DictionarywithexamplesC#|MethodOverridingDifferentwaystosortanarrayindescendingorderinC#C#|IsNullOrWhiteSpace()MethodDifferencebetweenRefandOutkeywordsinC#C#|HowtogetallelementsofaListthatmatchtheconditionsspecifiedbythepredicateC#|Array.FindAll()MethodC#|Array.Find()MethodC#|String.IndexOf()Method|Set–1C#|Substring()MethodString.Split()MethodinC#withExamplesC#|ArraysofStringsC#|ArraysC#|StackClassC#StackwithExamplesC#QueuewithExamplesLinkedListImplementationinC#C#|LinkedListClassC#|ListClassC#|HowtocheckwhetheraListcontainsaspecifiedelementC#|HowtocheckwhetheraListcontainstheelementsthatmatchthespecifiedconditionsC#|CheckifanarraycontaintheelementsthatmatchthespecifiedconditionsC#|CheckwhetheranelementiscontainedintheArrayListC#|GetorsettheelementatthespecifiedindexinArrayListC#|GetsorSetstheelementatthespecifiedindexintheListC#|IsNullOrEmpty()MethodDifferencebetweenAbstractClassandInterfaceinC#C#DictionarywithexamplesC#|MethodOverridingDifferentwaystosortanarrayindescendingorderinC#C#|IsNullOrWhiteSpace()MethodDifferencebetweenRefandOutkeywordsinC#C#|ArraysofStringsViewDiscussion ImproveArticle SaveArticle LikeArticle DifficultyLevel: ExpertLastUpdated: 19Nov,2019Anarrayisacollectionofthesametypevariable.WhereasastringisasequenceofUnicodecharactersorarrayofcharacters.Thereforearraysofstringsisanarrayofarraysofcharacters.Here,stringarrayandarraysofstringsbotharesameterm.ForExample,ifyouwanttostorethenameofstudentsofaclassthenyoucanusethearraysofstrings.Arraysofstringscanbeonedimensionalormultidimensional.Declaringthestringarray:TherearetwowaystodeclarethearraysofstringsasfollowsDeclarationwithoutsize:Syntax:String[]variable_name;orstring[]variable_name;Declarationwithsize:Syntax:String[]variable_name=newString[provide_size_here];orstring[]variable_name=newstring[provide_size_here];Example://declarationusingstringkeywordstring[]s1;//declarationusingStringclassobject//bygivingitssize4String[]s2=newString[4];InitializationofArraysofStrings:Arrayscanbeinitializedafterthedeclaration.Itisnotnecessarytodeclareandinitializeatthesametimeusingthenewkeyword.However,InitializinganArrayafterthedeclaration,itmustbeinitializedwiththenewkeyword.Itcan’tbeinitializedbyonlyassigningvalues.Example://Declarationofthearraystring[]str1,str2;//Initializationofarraystr1=newstring[5]{“Element1”,“Element2”,“Element3”,“Element4”,“Element5”};str2=newstring[]{“Element1”,“Element2”,“Element3”,“Element4”,“Element5”};Note:InitializationwithoutgivingsizeisnotvalidinC#.Itwillgivecompiletimeerror.Example:WrongDeclarationforinitializinganarray//compile-timeerror:mustgivesizeofanarrayString[]str=newString[];//error:wronginitializationofanarraystring[]str1;str1={“Element1”,“Element2”,“Element3”,“Element4”};AccessingArraysofStringsElements:Atthetimeofinitialization,wecanassignthevalue.But,wecanalsoassignthevalueofarrayusingitsindexrandomlyafterthedeclarationandinitialization.Wecanaccessanarrayvaluethroughindexing,placedindexoftheelementwithinsquarebracketswiththearrayname.Example: //declares&initializesstringarray String[]s1=newString[2]; //assignthevalue"Geeks"inarrayonitsindex0 s1[0]=10; //assignthevalue"GFG"inarrayonitsindex1 s1[1]=30; //assignthevalue"Noida"inarrayonitsindex2 s1[2]=20; //Accessingarrayelementsusingindex s1[0];//returnsGeeks s1[2];//returnsNoida Declarationandinitializationofstringarrayinasingleline:Stringarraycanalsobedeclaredandinitializedinasingleline.Thismethodismorerecommendedasitreducesthelineofcode.Example: String[]weekDays=newstring[3]{"Sun","Mon","Tue","Wed"}; Code#1:Stringarraydeclaration,initializationandaccessingitselements//C#programtoillustratetheStringarray //declaration,initializationandaccessing //itselementsusingSystem;  classGeeks{          //MainMethod    publicstaticvoidMain()    {        //Step1:ArrayDeclaration        string[]stringarr;                   //Step2:ArrayInitialization        stringarr=newstring[3]{"Element1","Element2","Element3"};                   //Step3:AccessingArrayElements        Console.WriteLine(stringarr[0]);         Console.WriteLine(stringarr[1]);         Console.WriteLine(stringarr[2]);     }}Output: Element1 Element2 Element3 Code#2:Arraydeclarationandinitializationinsingleline//C#codetoillustrateArraydeclaration//andinitializationinsinglelineusingSystem;  classGeeks{      //MainMethod    publicstaticvoidMain()    {        //arrayinitializationanddeclaration        String[]stringarr=newString[]{"Geeks","GFG","Noida"};           //accessingarrayelements        Console.WriteLine(stringarr[0]);        Console.WriteLine(stringarr[1]);        Console.WriteLine(stringarr[2]);    }}Output: Geeks GFG Noida Note:Inthepublicstaticvoidmain(String[]args),String[]argsisalsoanarrayofstring.Example:ToshowString[]argsisanarrayofstring.//C#programtogetthetypeof"args"usingSystem;  classGFG{      //MainMethod    staticpublicvoidMain(String[]args){                  //usingGetType()methodto        //gettypeatruntime        Console.WriteLine(args.GetType());    }}Output: System.String[] C#stringarrayisbasicallyanarrayofobjects.Itdoesn’tmatterwhetheryouarecreatinganarrayofstringusingstringkeywordorStringclassobject.Botharesame.Example://C#programtogetthetypeofarraysof //stringswhicharedeclaredusing'string'//keywordand'Stringclassobject'usingSystem;  classGFG{      //MainMethod    staticpublicvoidMain(String[]args){          //declaringarrayofstring         //usingstringkeyword        string[]s1={"GFG","Noida"};           //declaringarrayofstring         //usingStringclassobject        String[]s2=newString[2]{"Geeks","C#"};          //usingGetType()methodto        //gettypeatruntime        Console.WriteLine(s1.GetType());        Console.WriteLine(s2.GetType());    }}Output: System.String[] System.String[] MyPersonalNotes arrow_drop_upSave LikePreviousString.Split()MethodinC#withExamplesNext C#|ArraysRecommendedArticlesPage:08,Jun1824,Sep1822,Nov1830,Nov1803,Dec1828,Oct2123,Oct1818,Jul1811,Oct1811,Oct1823,Dec1926,Nov21ArticleContributedBy:AYUSDAS@AYUSDASVotefordifficultyCurrentdifficulty: ExpertEasy Normal Medium Hard ExpertImprovedBy:shubham_singhArticleTags:CSharp-ArraysCSharp-stringPickedC#ReportIssueWritingcodeincomment? 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