计算机科学与技术：VB.NET应用教程 978-7-302-09622-1 Advanced VB.NET Chapter 5

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1、Chapter5Directories,Files,Paths,andSequentialFileAccessObjectivesPaths,Directories,andFilesDirectoryandFileDialogsStreamsandtheSequentialAccessMethodLab5.1:DirectoriesandFileAccessLab5.2:TheSequentialAccessMethodSuggestedHomeAssignments2Copyright2004Pearson

2、Education,Inc.DirectoriesandFilesAFileiswheredataarestoredTextSpreadsheetPictureProgramVideoclipMusicclipAccessDatabaseAndsoon.ADirectoryisaclusterofFilesOtherdirectories3Copyright2004PearsonEducation,Inc.DirectoriesandFilesAFilecanbethroughofbeinganalogous

3、toabook.ADirectorycanbethroughofbeinganalogoustoalibrary.BooksareclusteredinlibrariesJustasfilesareclusteredinadirectorySometimes,librariesareclusteredinsidelargerlibraries.Justasdirectoriesaresometimesclusteredinaotherdirectories.4Copyright2004PearsonEduca

4、tion,Inc.PathTheaddressofadirectoryorofafileiscalleditsPathDirectoryPathFile5Copyright2004PearsonEducation,Inc.VBandDirectoriesTheDirectoryClassMethodsTheGetmethodsGetinformationaboutthedirectoryCurrentdirectoryDateandtimewhenthedirectorywascreated.Nameofth

5、erootdirector.DatewhenthedirectorywaslastaccessedDatewhenitwaslastupdated.TheSetMethodsSetsinformationaboutthedirectoryOthermethods6Copyright2004PearsonEducation,Inc.DirectoryGetMethodsGetCurrentDirectoryReturnsthepathofthecurrentdirectory.GetCreationTimeRe

6、turnsthedateandtimewhenthedirectorywascreated.GetDirectoryRootReturnsthenameoftherootdirectory.GetLastAccessTimeReturnswhenthedirectorywaslastaccessed.GetLastWriteTimeReturnswhenthedirectorywaslastupdated.GetDirectoriesReturnsacollectionwiththenamesofthesub

7、directoriesThiscollectioncanbereadwithaForEachloop.7Copyright2004PearsonEducation,Inc.ExampleDimstrPathAsStringIfNotIO.Directory.Exists(strPath))ThenstrPath=System.IO.Directory.GetCurrentDirectory()EndIfConsole.WriteLine("CreationTime"&_System.IO.Directory.

8、GetCreationTime(strPath))Console.WriteLine("CurrentDirectory"&_System.IO.Directory.GetCurrentDirectory)Console.WriteLine("DirectoryRoot"&_System.IO.Directory.GetDirectoryRoot(strPath))Console.WriteLine