Category Archives: C# Programming

Section50.1:OptionalArguments Considerprecedingisourfunctiondefinitionwithoptionalarguments. privatestaticdoubleFindAreaWithOptional(intlength,intwidth=56) { try { return(length*width); } catch(Exception) { thrownewNotImplementedException(); } } Herewehavesetthevalueforwidthasoptionalandgavevalueas56.Ifyounote,theIntelliSenseitselfshowsyou the optional argument as shown in the below image.…

Section49.1:Argumentorderisnotnecessary Youcanplacenamedargumentsinanyorderyouwant. Sample Method: publicstaticstringSample(stringleft,stringright) { returnstring.Join("-",left,right); } CallSample: Console.WriteLine(Sample(left:"A",right:"B")); Console.WriteLine(Sample(right:"A",left:"B")); Results: A-B B-A Section49.2:Namedargumentsandoptionalparameters You can combine named arguments with optional parameters.…

Section48.1:Extensionmethods-overview Extension methods were introduced in C# 3.0. Extension methods extend and add behavior to existing typeswithout creating a new derived type, recompiling,…

Section47.1:CallingaMethod Callingastaticmethod: //Singleargument System.Console.WriteLine("HelloWorld"); //Multiplearguments stringname="User"; System.Console.WriteLine("Hello,{0}!",name); Callingastaticmethodandstoringitsreturnvalue: stringinput=System.Console.ReadLine(); Callinganinstancemethod: intx=42; //TheinstancemethodcalledhereisInt32.ToString() stringxAsString=x.ToString(); Callingagenericmethod //Assumingamethod'T[]CreateArray<T>(intsize)' DateTime[]dates=CreateArray<DateTime>(8); Section47.2:Anonymousmethod Anonymousmethodsprovideatechniquetopassacodeblockasadelegateparameter.Theyaremethodswitha body, but no name. delegateintIntOp(intlhs,intrhs);…

Section46.1:Simpleusage Object initializers are handy when you need to create an object and set a couple of properties right away, but the available…

Partial classes provides us an option to split classes into multiple parts and in multiple source files. All parts are combined into one…

Section44.1:DependencyInjectionC#andASP.NETwithUnity First why we should use depedency injection in our code ? We want to decouple other components from other classes in our…

Section43.1:StaticallyInitializedSingleton publicclassSingleton { privatereadonlystaticSingletoninstance=newSingleton(); privateSingleton(){} publicstaticSingletonInstance=>instance; } Thisimplementationisthread-safebecauseinthiscaseinstanceobjectisinitializedinthestaticconstructor.The CLRalreadyensuresthatallstaticconstructorsareexecutedthread-safe. Mutatinginstanceisnotathread-safeoperation,thereforethereadonlyattributeguaranteesimmutabilityafter initialization. Section43.2:Lazy,thread-safeSingleton(usingLazy<T>) .Net4.0typeLazyguaranteesthread-safeobjectinitialization,sothistypecouldbeusedtomakeSingletons. publicclassLazySingleton { privatestaticreadonlyLazy<LazySingleton>_instance=newLazy<Laz ySingleton>(()=>newLazySingleton()); publicstaticLazySingletonInstance { get{return_instance.Value;} } privateLazySingleton(){} }…

Section42.1:StaticClasses The"static"keywordwhenreferringtoaclasshasthree effects: Youcannotcreateaninstanceofastaticclass(thisevenremovesthedefaultconstructor) Allpropertiesandmethodsintheclassmustbestaticaswell. Astaticclassisasealedclass,meaningitcannotbeinherited. publicstaticclassFoo { //Noticethereisnoconstructorasthiscannotbeaninstance publicstaticintCounter{get;set;} publicstaticintGetCount() { returnCounter; } } publicclassProgram { staticvoidMain(string[]args) { Foo.Counter++; Console.WriteLine(Foo.GetCount());//thiswillprint1 //varfoo1=newFoo(); //thislinewouldbreakthecodeastheFooclassdoesnothaveaconstructor…

Section41.1:ImplementinganinterfaceAninterfaceisusedtoenforcethepresenceofamethodinanyclassthat'implements'it.Theinterfaceisdefined withthekeywordinterfaceandaclasscan'implement'itbyadding:InterfaceNameaftertheclassname.Aclass canimplementmultipleinterfacesbyseparatingeachinterfacewithacomma.:InterfaceName,ISecondInterface publicinterfaceINoiseMaker { stringMakeNoise(); } publicclassCat:INoiseMaker { publicstringMakeNoise() { return"Nyan"; } } publicclassDog:INoiseMaker { publicstringMakeNoise() { return"Woof"; } } Because they…