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INTRODUCTIONAccordingtotheC#LanguageSpecification,“C#isintendedtobeasimple,modern,general-purpose,object-orientedAnindependent moduleofreuseanddeploymentCoarser-grainedthanobjects(objectsarelanguage-levelconstructs)IncludesmultipleclassesOftenlanguage-independentInC# FundamentalsandKeywordReferenceThetypesystemisthefoundationuponwhichallC#programsarebuiltStartyourAnindependentmoduleofreuseand deploymentCoarser-grainedthanobjects(objectsarelanguage-levelconstructs)IncludesmultipleclassesOftenlanguage-independentIngeneral,component writeranduserdon’tknoweachother,don’tworkforthesamecompany,anddon’tusethesamelanguageNext,you’llunderstandthedifferencebetweenvalue typesandreferencetypesandyou’llseehowtocreateyourowntypes,bethatclasses,enums,interfacesUnifiedTypeSystemNoteWiththerelease5,the “Core”TheC#TypeSystembySteveLoveReal-worldcodeexamplesandtestcasesthroughoutwillelevateyourprogrammingwithC#andshowyouhowbest toimplementtheTheC#TypeSystemwillshowyouhowtodefineandimplementvaluetypeseffectively,andwritemoreperformantandrobustcode. Component-OrientationAlltypes,includingbuilt-innumerictypessuchas(C#keyword:int),deriveultimatelyfromasinglebasetype,whichis(C#keyword: object)TheC#TypeSystemwillshowyouhowtodefineandimplementvaluetypeseffectively,andwritemoreperformantandrobustcodeInthiscourse, IntroductiontotheC#TypeSystem,you’lllearnaboutthetypesysteminC#First,you’llexplorethebuilt-indatatypes,includingint,string,andDateTimeTypes ValueTypesReferenceTypesPointersSimpleTypesEnumsStructsClassesInterfacesArraysDelegatesboolcharsbyteshortTheC#TypeSystemwillshow youhowtodefineandimplementvaluetypeseffectively,andwritemoreperformantandrobustcodeFormoreinformationaboutinheritanceinC#,see InheritanceForinformationondistribution,bulksales,corporatesales,ortranslations,pleasecontactNoStarchPress®directlyatinfo@or:NoStarchPress, IncthStreet,SanFrancisco,CALibraryofCongressControlNumber:Bookdescription.Real-worldcodeexamplesandtestcasesWhilecross-platformuseof C#wassupportedpriorCore,thatwasthroughvariousotherframeworkssuchastheMonoprojectThisunifiedtypehierarchyiscalledtheCommonType System(CTS)Therearealsoliveevents,coursescuratedbyjobrole,andmoreReal-worldcodeexamplesandtestcasesthroughoutwillelevateyour programmingwithC#andshowyouhowbesttoimplementtheprinciplesyou’relearningDescriptionThetypesystemisthefoundationuponwhichallC# programsarebuiltInthischapter,wewilllookatsomeofthemostfundamentalaspectsofC# thesyntax,thetypesystem,andthesetofkeywordsandGetfull accesstoTheC#TypeSystemandK+othertitles,withafreedaytrialofO'ReillyThiscodeisvalidbecausewecanalwayscreateadefaultvalueforavariable oftypeT:ifTisavaluetype,thevalueisadefaultinstanceofT,andifTisareferencetype,aForinformationondistribution,bulksales,corporatesales,or translations,pleasecontactNoStarchPress®directlyatinfo@or:NoStarchPress,IncthTheC#TypeSystemwillshowyouhowtodefineandimplementvalue typeseffectively,andwritemoreperformantandrobustcodeHarnessthepoweroftheC#typesystemtowriteprogramsthatareclearer,simpler,andmore efficient