C# Properties (GET, SET) - Tutlane

In c#, properties will enable class variables to expose in a public way using get and set accessors by hiding implementation details. · In properties, a get ... 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Read-Only Apropertythatcontainsonlygetaccessor,thenwewillcallitaread-onlyproperty. Write-Only Apropertythatcontainsonlysetaccessor,thenwewillcallitawrite-onlyproperty. Inc#,Propertieswon’tacceptanyparameters,andweshouldnotpassapropertyasareforoutparameterinourapplication.   Followingisthesimpleexampleofdefiningaprivatevariableandapropertyinthec#programminglanguage.   classUser{  privatestringname;  publicstringName  {    get{returnname;}    set{name=value;}  }} Ifyouobservetheaboveexample,wedefinedapropertycalled“Name”andweusedagetaccessortoreturnapropertyvalueandsetaccessorstosetanewvalue.Here,thevalue keyword in set accessorisusedtodefineavaluethatisbeingassignedby set accessor.   Inc#,the get accessorneedstobeusedonlytoreturnthefieldvalueortocomputeitandreturnit,butweshouldnotuseitforchangingthestateofanobject.   Asdiscussed,wecanextendthebehaviorofclass variables usingproperties get and set accessors.Followingistheexampleofextendingthebehaviorofprivate variable inpropertyusing get and set accessors inc#programminglanguage.   classUser{  privatestringname="SureshDasari";  publicstringName  {   get   {     returnname.ToUpper();   }   set   {     if(value=="Suresh")       name=value;   }  }} Ifyouobservetheaboveexample,weareextendingthebehaviorofprivate variable nameusingapropertycalledNamewithgetandsetaccessorsbyperformingsomevalidationsliketomakesureNamevalueequalstoonly“Suresh”usingsetaccessorandconvertingpropertytexttouppercasewithgetaccessor.   Herethefield“name”ismarkedasprivate,soifyouwanttomakeanychangestothisfield,wecandoitonlybycallingtheproperty(Name).   Inc#properties,the get accessorwillbeinvokedwhilereadingthevalueofaproperty,andwhenweassignanewvaluetotheproperty,thenthe set accessorwillbeinvokedbyusinganargumentthatprovidesthenewvalue.   Followingistheexampleofinvoking get and set accessorsofpropertiesinc#programminglanguage.   Useru=newUser();u.Name="Rohini";//setaccessorwillinvokeConsole.WriteLine(u.Name);//getaccessorwillinvoke Intheaboveexample,whenweassignanewvaluetotheproperty,thenthe set accessorwillbeinvokedandthe get accessorwillbeinvokedwhenwetrytoreadthevaluefromtheproperty. C#Properties(Get,Set)Example Followingistheexampleofdefiningproperties with get and set accessorstoimplementrequiredvalidationswithoutaffectingtheexternalwayofusingitinthec#programminglanguage.   usingSystem;namespaceTutlane{   classUser   {    privatestringlocation;    privatestringname="SureshDasari";    publicstringLocation    {      get{returnlocation;}      set{location=value;}    }    publicstringName    {      get      {        returnname.ToUpper();      }      set      {        if(value=="Suresh")         name=value;      }    }   }   classProgram   {    staticvoidMain(string[]args)    {      Useru=newUser();      //setaccessorwillinvoke      u.Name="Rohini";      //setaccessorwillinvoke      u.Location="Hyderabad";      //getaccessorwillinvoke      Console.WriteLine("Name:"+u.Name);      //getaccessorwillinvoke      Console.WriteLine("Location:"+u.Location);      Console.WriteLine("\nPressEnterKeytoExit..");      Console.ReadLine();    }   }} Ifyouobservetheaboveexample,weareextendingthebehaviorofprivate variables (name,location)usingproperties(Name,Location)with get and set accessorsbyperformingsomevalidationsliketomakesureNamevalueequalstoonly“Suresh”using set accessorandconvertingpropertytexttouppercasewith get accessor.   Whenyouexecutetheabovec#program,wewillgettheresultasshownbelow.     Ifyouobservetheaboveexample,ourvariabletextconvertedtouppercase,andevenafterwesetvariabletextas“Rohini”,itdisplayedtextas“SureshDasari”becauseofthe set accessorvalidationfailsintheproperty. C#CreateRead-OnlyProperties Asdiscussed,ifapropertycontainstheonly get accessor,thenwewillcallita read-onlyproperty. Followingistheexampleofcreating read-only properties inthec#programminglanguage.   usingSystem;namespaceTutlane{  classUser  {    privatestringname;    privatestringlocation;    publicUser(stringa,stringb)    {     name=a;     location=b;    }    publicstringName    {     get     {       returnname;     }    }    publicstringLocation    {     get     {       returnlocation;     }    }  }  classProgram  {    staticvoidMain(string[]args)    {      Useru=newUser("SureshDasari","Hyderabad");      //compileerror      //u.Name="Rohini";      //getaccessorwillinvoke      Console.WriteLine("Name:"+u.Name);      //getaccessorwillinvoke      Console.WriteLine("Location:"+u.Location);      Console.WriteLine("\nPressEnterKeytoExit..");      Console.ReadLine();    }  }} Ifyouobservetheaboveexample,wecreatedpropertiesusingonly get accessortomakethepropertiesare read-only basedonourrequirements.   Ifweuncommentthecommentedcode,wewillgetacompileerrorbecauseourNamepropertydoesn’tcontainany set accessortosetanewvalue.It’sjust read-only property.   Whenyouexecutetheabovec#program,youwillgetaresultlikeasshownbelow.     Thisishowwecancreate read-only propertiesinc#applicationsbasedonourrequirements. C#CreateWriteOnlyProperties Asdiscussed,ifapropertycontainstheonly set accessor,thenwewillcallitawrite-onlyproperty. Followingistheexampleofcreatingwrite-onlyproperties inthec#programminglanguage.   usingSystem;namespaceTutlane{   classUser   {    privatestringname;    publicstringName    {      set      {       name=value;      }    }    privatestringlocation;    publicstringLocation    {      set      {        location=value;      }    }    publicvoidGetUserDetails()    {      Console.WriteLine("Name:"+name);      Console.WriteLine("Location:"+location);    }   }   classProgram   {     staticvoidMain(string[]args)     {       Useru=newUser();       u.Name="SureshDasari";       u.Location="Hyderabad";       //compileerror       //Console.WriteLine(u.Name);       u.GetUserDetails();       Console.WriteLine("\nPressEnterKeytoExit..");       Console.ReadLine();     }   }} Ifyouobservetheaboveexample,wecreatedpropertiesusingonly set accessortomakethepropertiesarewrite-onlybasedonourrequirements.   Ifweuncommentthecommentedcode,thenwewillgetacompileerrorbecauseourNamepropertydoesn’tcontainany get accessortoreturnavalue.It’sajustwrite-onlyproperty.   Whenyouexecutetheabovec#program,youwillgetaresultlikeasshownbelow.     Thisishowwecancreatewrite-onlypropertiesinc#applicationsbasedonourrequirements. C#AutoImplementedProperties Inc#,apropertyiscalledanauto-implementedpropertywhenitcontainsaccessors(get,set)withouthavinganylogicimplementation.   Generally,theauto-implementedpropertiesareusefulwheneverthereisnologicimplementationrequiredinpropertyaccessors.   Followingistheexampleofcreatingauto-implementedpropertiesinthec#programminglanguage.   usingSystem;namespaceTutlane{   classUser   {    publicstringName{get;set;}    publicstringLocation{get;set;}   }   classProgram   {     staticvoidMain(string[]args)     {       Useru=newUser();       u.Name="SureshDasari";       u.Location="Hyderabad";       Console.WriteLine("Name:"+u.Name);       Console.WriteLine("Location:"+u.Location);       Console.WriteLine("\nPressEnterKeytoExit..");       Console.ReadLine();     }   }} Ifyouobservetheaboveexample,wecreatedpropertieswith get and set accessorswithouthavinganylogicimplementation.   Whenyouexecutetheabovec#program,wewillgetaresultlikeasshownbelow.     Thisishowwecancreateauto-implementedpropertiesinc#applicationsbasedonourrequirements. C#PropertiesOverview Thefollowingaretheimportantpointswhichweneedtorememberaboutpropertiesinthec#programminglanguage.   Inc#,propertieswillenableclassvariablestoexposeinapublicwayusing get and set accessorsbyhidingimplementationdetails. Inproperties,a get accessorisusedtoreturnapropertyvalueanda set accessorisusedtoassignanewvalue. The value  keyword in set accessorisusedtodefineavaluethatisgoingtobeassignedbythe set accessor. Inc#,thepropertiesarecategorizedasread-write,read-only,orwrite-only. Previous   Next    TableofContents PropertiesinC#withExamples C#Properties(GetSet)Example C#ReadOnlyPropertieswithExamples C#WriteOnlyPropertieswithExamples C#AutoImplementedPropertieswithExamples