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外文翻译--ASP.NET技术和VB语言.doc

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外文翻译--ASP.NET技术和VB语言.doc

ASP.NETtechnologyandVBlanguageASP.NETisaunifiedWebdevelopmentmodelthatincludestheservicesnecessaryforyoutobuildenterpriseclassWebapplicationswithaminimumofcoding.ASP.NETispartofthe.NETFramework,andwhencodingASP.NETapplicationsyouhaveaccesstoclassesinthe.NETFramework.YoucancodeyourapplicationsinanylanguagecompatiblewiththecommonlanguageruntimeCLR,includingMicrosoftVisualBasic,C,JScript.NET,andJ.TheselanguagesenableyoutodevelopASP.NETapplicationsthatbenefitfromthecommonlanguageruntime,typesafety,inheritance,andsoon.ASP.NETincludesApageandcontrolsframeworkTheASP.NETcompilerSecurityinfrastructureStatemanagementfacilitiesApplicationconfigurationHealthmonitoringandperformancefeaturesDebuggingsupportAnXMLWebservicesframeworkExtensiblehostingenvironmentandapplicationlifecyclemanagementAnextensibledesignerenvironment.TheASP.NETpageandcontrolsframeworkisaprogrammingframeworkthatrunsonaWebservertodynamicallyproduceandrenderASP.NETWebpages.ASP.NETWebpagescanberequestedfromanybrowserorclientdevice,andASP.NETrendersmarkupsuchasHTMLtotherequestingbrowser.Asarule,youcanusethesamepageformultiplebrowsers,becauseASP.NETrenderstheappropriatemarkupforthebrowsermakingtherequest.However,youcandesignyourASP.NETWebpagetotargetaspecificbrowser,suchasMicrosoftInternetExplorer6,andtakeadvantageofthefeaturesofthatbrowser.ASP.NETsupportsmobilecontrolsforWebenableddevicessuchascellularphones,handheldcomputers,andpersonaldigitalassistantsPDAs.ASP.NETWebpagesarecompletelyobjectoriented.WithinASP.NETWebpagesyoucanworkwithHTMLelementsusingproperties,methods,andevents.TheASP.NETpageframeworkremovestheimplementationdetailsoftheseparationofclientandserverinherentinWebbasedapplicationsbypresentingaunifiedmodelforrespondingtoclienteventsincodethatrunsattheserver.Theframeworkalsoautomaticallymaintainsthestateofapageandthecontrolsonthatpageduringthepageprocessinglifecycle.TheASP.NETpageandcontrolsframeworkalsoenablesyoutoencapsulatecommonUIfunctionalityineasytouse,reusablecontrols.Controlsarewrittenonce,canbeusedinmanypages,andareintegratedintotheASP.NETWebpagethattheyareplacedinduringrendering.TheASP.NETpageandcontrolsframeworkalsoprovidesfeaturestocontroltheoveralllookandfeelofyourWebsiteviathemesandskins.Youcandefinethemesandskinsandthenapplythematapageleveloratacontrollevel.AllASP.NETcodeiscompiled,whichenablesstrongtyping,performanceoptimizations,andearlybinding,amongotherbenefits.Oncethecodehasbeencompiled,thecommonlanguageruntimefurthercompilesASP.NETcodetonativecode,providingimprovedperformance.ASP.NETincludesacompilerthatwillcompileallyourapplicationcomponentsincludingpagesandcontrolsintoanassemblythattheASP.NEThostingenvironmentcanthenusetoserviceuserrequests.Inadditiontothesecurityfeaturesof.NET,ASP.NETprovidesanadvancedsecurityinfrastructureforauthenticatingandauthorizinguseraccessaswellasperformingothersecurityrelatedtasks.YoucanauthenticateusersusingWindowsauthenticationsuppliedbyIIS,oryoucanmanageauthenticationusingyourownuserdatabaseusingASP.NETformsauthenticationandASP.NETmembership.Additionally,youcanmanagetheauthorizationtothecapabilitiesandinformationofyourWebapplicationusingWindowsgroupsoryourowncustomroledatabaseusingASP.NETroles.Youcaneasilyremove,addto,orreplacetheseschemesdependingupontheneedsofyourapplication.ASP.NETalwaysrunswithaparticularWindowsidentitysoyoucansecureyourapplicationusingWindowscapabilitiessuchasNTFSAccessControlListsACLs,databasepermissions,andsoon.FormoreinformationontheidentityofASP.NET,ASP.NETprovidesintrinsicstatemanagementfunctionalitythatenablesyoutostoreinformationbetweenpagerequests,suchascustomerinformationorthecontentsofashoppingcart.Youcansaveandmanageapplicationspecific,sessionspecific,pagespecific,userspecific,anddeveloperdefinedinformation.Thisinformationcanbeindependentofanycontrolsonthepage.ASP.NEToffersdistributedstatefacilities,whichenableyoutomanagestateinformationacrossmultipleinstancesofthesameapplicationononecomputeroronseveralcomputers.ASP.NETapplicationsuseaconfigurationsystemthatenablesyoutodefineconfigurationsettingsforyourWebserver,foraWebsite,orforindividualapplications.YoucanmakeconfigurationsettingsatthetimeyourASP.NETapplicationsaredeployedandcanaddorreviseconfigurationsettingsatanytimewithminimalimpactonoperationalWebapplicationsandservers.ASP.NETconfigurationsettingsarestoredinXMLbasedfiles.BecausetheseXMLfilesareASCIItextfiles,itissimpletomakeconfigurationchangestoyourWebapplications.Youcanextendtheconfigurationschemetosuityourrequirements.ASP.NETincludesfeaturesthatenableyoutomonitorhealthandperformanceofyourASP.NETapplication.ASP.NEThealthmonitoringenablesreportingofkeyeventsthatprovideinformationaboutthehealthofanapplicationandabouterrorconditions.Theseeventsshowacombinationofdiagnosticsandmonitoringcharacteristicsandofferahighdegreeofflexibilityintermsofwhatisloggedandhowitislogged.ASP.NETsupportstwogroupsofperformancecountersaccessibletoyourapplicationscountergroupASP.NETtakesadvantageoftheruntimedebugginginfrastructuretoprovidecrosslanguageandcrosscomputerdebuggingsupport.Youcandebugbothmanagedandunmanagedobjects,aswellasalllanguagessupportedbythecommonlanguageruntimeandscriptlanguages.Inaddition,theASP.NETpageframeworkprovidesatracemodethatenablesyoutoinsertinstrumentationmessagesintoyourASP.NETWebpages.ASP.NETsupportsXMLWebservices.AnXMLWebserviceisacomponentcontainingbusinessfunctionalitythatenablesapplicationstoexchangeinformationacrossfirewallsusingstandardslikeHTTPandXMLmessaging.XMLWebservicesarenottiedtoaparticularcomponenttechnologyorobjectcallingconvention.Asaresult,programswritteninanylanguage,usinganycomponentmodel,andrunningonanyoperatingsystemcanaccessXMLWebservices.ASP.NETincludesanextensiblehostingenvironmentthatcontrolsthelifecycleofanapplicationfromwhenauserfirstaccessesaresourcesuchasapageintheapplicationtothepointatwhichtheapplicationisshutdown.WhileASP.NETreliesonaWebserverIISasanapplicationhost,ASP.NETprovidesmuchofthehostingfunctionalityitself.ThearchitectureofASP.NETenablesyoutorespondtoapplicationeventsandcreatecustomHTTPhandlersandHTTPmodules.ASP.NETincludesenhancedsupportforcreatingdesignersforWebservercontrolsforusewithavisualdesigntoolsuchasVisualStudio.Designersenableyoutobuildadesigntimeuserinterfaceforacontrol,sothatdeveloperscanconfigureyourcontrolspropertiesandcontentinthevisualdesigntool.MicrosoftVisualBasic,abbreviateVBastoolthemostofapplicationprogramoneofunderWindowsoperatingplatform.Nomatterbeginnerorprofessionaldeveloper,VBhasallofferedawholesetoftoolstothem,Developmentapplicationprogramthatitcanberelaxedandconvenient.SoVBasmostcomputerfirstselectedtheABCofprogramminglanguageofbeginner.VisualmeanmethodtoadoptvisualuserofdevelopmentfigureinterfaceGUI,needandwritealargenumberofcodegoanddescribeinterfaceappearanceandpositionofelementseldom,Towandshowcontrollingpartthatneedcorrespondingpositiontogetscreencanhelpfiguredesigninterface,useroffigure,BasicmeansBASIClanguage,becauseVBisdevelopedonthebasisofalreadyexistingBAISClanguage.VBisakindofprogramminglanguageincommonuseofMicrosoft,It,includingVBAofthenumerousWindowsapplicationsoftwareuseVBlanguageinMicrosoftExcel,MicrosoftAccessed.,ForuserstocarryonthesecondarydevelopmentMakewebpageusemoreVBScriptscriptlanguagesubcollectionofVBtooatpresent.UtilizedataofVBvisitcharacteristicusercanestablishthedatabasetomostdatabaseformsincludingMicrosoftSQLServerandotherenterprisesdatabaseWiththeapplicationprogramoffront,andadjustableserviceendpart.UtilizeActiveXTMtechnology,VBcanusewordprocessor,electronicdatalistheWindowsfunctionthatapplicationprogramoffersextremely,ExcelofMicrosoft,,WordofMicrosoft,,EvencanusebyVBspecialtyeditionorenterpriseapplicationprogramandtargetthateditionestablishdirectly.Theprocedurethatusersestablishedfinallyisareal.EXEfile,canissuefreely.VBofferstudyedition,thespecialtyeditionandenterpriseedition,usetosatisfiedwithdifferentdevelopmentdemands.StudyeditionmakeprogrammingpersonneldevelopWindowsandWindowsapplicationprogramofNTveryeasily.Thespecialtyeditionhasofferedthedevelopinginstrumentwithcompletefunctiontoprogrammingpersonnelofthespecialty,Includestudyingallfunctionsofeditioninthespecialtyedition.Enterpriseeditionallowtheprofessionalpersonneltoestablishstrongdistributedapplicationprogramintheformofgroup.Itincludesallcharacteristicsofthespecialtyedition.Socanchoosedifferenteditionsaccordingtodifferentneeds.Section1integrateddevelopmentenvironmentsIntegratedenvironmentofVBcallIDE,madeupofalotofparts,includetitleboard,menufence,toolfence,controllingpartcase,Andwindowbodywindow,engineeringmanagementdevicewindow,attributewindow,codewindowandwindowbodyoverallarrangementwindowbodyoverallarrangement,etc.ofdesigningetc..Havecoveredallfunctions,suchasdesignwhichdevelopstheapplicationprogram,editting,compilinganddebugging,etc..InVB,theapplicationprogramcallstheprojecttoo.WhenstartVBandopenanewprojectforthefirsttime,canseeandpursueintegrateddevelopmentenvironmentinterfacethatshow.VBcomeandorganizedevelopmentofapplicationprogramthroughproject,useprojectcomeandmanageandformfilesofapplicationprogram.Oneprojectusestheenvironmenttomakeupbyseveralwindowbodies,standardmodulegenerally.Thesystemmanagesprojectthroughtheprojectmenu,forinstanceaddthewindowbody,quote.Systemallowturnonandmanagealotofprojectsbesides.Section2VisualBasiclanguagebriefintroductionsBasicuseanddotheelementaryhighlevellanguagethatusedoftenmost.ItsfullnameisBeginnersAllpurposeSymbolicInstructionCode,abbreviateasBASIC.Asitsnamesuggests,Basiconespeciallyforlanguagethatbeginnerdesign,becauseiteasytolearneasytoknow,Sothebodyispopular.EarlyBasiclanguagetobelongtoandsolvetranslatingtype,socancarryoutlinebyline,Soitcanseetheresultcarriedoutatonce,thisisaveryconvenientdesignforbeginner.Butithaveconceptofstructureeither,onethatisinproceduremaintainandmanagementhaveasmuchasotherlanguageproblems.ButbackendBasiccorrectshortcomingoftheabovesuchasQuickBasic,makeitmayusedforanddevelopthelargescalerproceduretoo.Section3LanguageThelanguageisthebasiccomposition,whichformsVBprocedure.VBhasstipulatedtheformofsentencesandfunction.GrammarThesentencedefinesincantationsSentence

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