If the archive does not exist, a new archive is created however, creating a zip archive in Update mode is not as efficient as creating it in Create mode. The existing entries can be modified and new entries can be created. When you set the mode parameter to Update, the archive is opened with FileMode.OpenOrCreate as the file mode value.
If the archive already exists, an IOException is thrown. When you set the mode parameter to Create, the archive is opened with FileMode.CreateNew as the file mode value. Setting the mode parameter to Read is equivalent to calling the OpenRead method. If the archive does not exist, a FileNotFoundException exception is thrown. When you set the mode parameter to Read, the archive is opened with Open from the FileMode enumeration as the file mode value. Using archive As ZipArchive = ZipFile.Open(zipPath, ZipArchiveMode.Update)Īrchive.CreateEntryFromFile(newFile, "NewEntry.txt", CompressionLevel.Fastest) String zipPath = extractPath = newFile = (ZipArchive archive = ZipFile.Open(zipPath, ZipArchiveMode.Update))Īrchive.CreateEntryFromFile(newFile, "NewEntry.txt") ĭim zipPath As String = "c:\users\exampleuser\end.zip"ĭim extractPath As String = "c:\users\exampleuser\extract"ĭim newFile As String = "c:\users\exampleuser\NewFile.txt"
#Opening zipx file how to#
The following example shows how to open a zip archive in the update mode and add an entry to the archive. Mode is Update, but an entry is too large to fit into memory. Mode is Update, but an entry is missing or corrupt and cannot be read. ArchiveFileName could not be interpreted as a zip archive.
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