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1、Chapter1SyntaxofC#Language1.1Object-OrientedProgramminginC#ThefirstsectionintroducestheC#languageandtheprinciplesofobject-orientedprogrammingingeneral.WecoverthesyntaxOfC#andhowtocreatesimpleprograms?Thenwediscussclasses,objects,inheritance,andinterfacesandexplainthefu
2、ndamentalsofUMLdiagrams.BythetimeyoiTvefinishedthisintroductorysection,youshouldfeelquiteathomeinC#and00programmingandreadytolearnhowtouseDesignPatternsinyourprogramming.C#hasallthefeaturesofanypowerful,modernlanguage?IfyouarefamiliarwithJava,C,orC++”you'llfindmostofC#
3、'ssyntaxveryfamilia匚IfyouhavebeenworkinginVisualBasicorrelatedareas,youshouldreadthischaptertoseehowC#differsfromVB.You'llquicklyseethateverymajoroperationyoucancarryoutinVisualBasic.NEThasasimilaroperationinC#?ThetwomajordifferencesbetweenC#andVisualBasicare(l)C#iscas
4、esensitive(mostofitssyntaxiswritteninlowercase),and(2)everystatementinC#isterminatedwithasemicolon(;).Thus,C#statementsarenotconstrainedtoasingleline,andthereisnolinecontinuationcharacter.InVisualBasic,wecouldwritethefollowing?y=m*x+bComputeyforgivenxOrwecouldwritethis
5、.Y=M*X+brcomputeyforgivenxBothwouldbetreatedasthesame.ThevariablesY,M,andXarethesamewhetherwritteninupper-orlowercase.InC#,however,caseissignificant,andifwewritethisConstPI=3.1416AsSingleinVBconstfloatPI=3.1416;//inc#TheconstmodifierinC#meansthatthenamedValueisaconstan
6、tandcannotbemodified.Programmersalsosometimesdefinedatatypeswithmixedcaseandvariablesofthatdatatypewithlowercase.classTemperature{//begindefinitionof//newdatatypeTemperaturetemp;//tempisofthisnewtypeWellcoverclassesinmuchmoredetailinthechaptersthatfollow.1.2DataTypesTh
7、emajordatatypesinC#areshowninTable2?l.Notethelengthsofthesebasictypesarenotrelatedtothecomputertypeoroperatingsystem.CharactersandstringsinC#arealways16bitswidetoallowforrepresentationofcharactersinnon-Latinlanguages?ItusesacharactercodingsystemcalledUnicode,inwhichtho
8、usandsofcharactersformostmajorwrittenlanguageshavebeendefined?Youcanconvertbetweenvariabletypesintheusualways.booltru
