The stream that is internally created by the CreateFromDirectory method remains opened and the user can't close it:
This is error message observed when using the below code snippet:
The process cannot access the file 'C:\Users\dyordano\OneDrive - Progress Software Corporation\MyProjects\1640071ZipFileCreateFromDirectory\myzip.zip' because it is being used by another process.
static void Main(string[] args)
string archiveFileName = @"..\..\myzip.zip";
string sourceDirectoryName = @"..\..\Folder";
File.Delete(archiveFileName);
Telerik.Windows.Zip.Extensions.ZipFile.CreateFromDirectory(sourceDirectoryName, archiveFileName, Telerik.Windows.Zip.CompressionLevel.Optimal, true);
using (Stream stream = File.Open(archiveFileName, FileMode.Open))
}
Workaround:
static void Main(string[] args)
string archiveFileName = @"..\..\myzip.zip";
string sourceDirectoryName = @"..\..\Folder";
File.Delete(archiveFileName);
CreateFromDirectory(sourceDirectoryName, archiveFileName, Telerik.Windows.Zip.CompressionLevel.Optimal, true);
using (Stream stream = File.Open(archiveFileName, FileMode.Open))
private static void CreateFromDirectory(string sourceDirectoryName, string destinationArchiveFileName, Telerik.Windows.Zip.CompressionLevel compressionLevel, bool includeBaseDirectory)
Encoding entryNameEncoding = null;
DeflateSettings compressionSettings = new DeflateSettings()
CompressionLevel = compressionLevel,
HeaderType = CompressedStreamHeader.None
char[] directorySeparatorChar = new char[] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar };
sourceDirectoryName = Path.GetFullPath(sourceDirectoryName);
destinationArchiveFileName = Path.GetFullPath(destinationArchiveFileName);
FileStream fileStream = File.Open(destinationArchiveFileName, FileMode.CreateNew, FileAccess.Write, FileShare.None); ;
using (ZipArchive zipArchive = new ZipArchive(fileStream, ZipArchiveMode.Create,false, entryNameEncoding))
bool empty = true;
DirectoryInfo directoryInfo = new DirectoryInfo(sourceDirectoryName);
string fullName = directoryInfo.FullName;
if (includeBaseDirectory && directoryInfo.Parent != null)
fullName = directoryInfo.Parent.FullName;
foreach (FileSystemInfo fileSystemInfo in directoryInfo.EnumerateFileSystemInfos("*", SearchOption.AllDirectories))
empty = false;
int length = fileSystemInfo.FullName.Length - fullName.Length;
string entryName = fileSystemInfo.FullName.Substring(fullName.Length, length);
entryName = entryName.TrimStart(directorySeparatorChar);
DirectoryInfo subfolder = fileSystemInfo as DirectoryInfo;
if (subfolder != null)
if (IsDirectoryEmpty(subfolder))
zipArchive.CreateEntry(string.Concat(entryName, Path.DirectorySeparatorChar));
ZipFile.CreateEntryFromFile(zipArchive, fileSystemInfo.FullName, entryName, compressionSettings);
if (includeBaseDirectory && empty)
zipArchive.CreateEntry(string.Concat(directoryInfo.Name, Path.DirectorySeparatorChar));
private static bool IsDirectoryEmpty(DirectoryInfo directoryInfo)
bool empty = true;
using (IEnumerator<FileSystemInfo> enumerator = directoryInfo.EnumerateFileSystemInfos("*", SearchOption.AllDirectories).GetEnumerator())
if (enumerator.MoveNext())
empty = false;
return empty;
}
Note: We should ensure that all of the obsolete API that used to use the "leave open" flag don't keep the stream locked.
Hi Joe,
I checked the code snippet from this ticket thread and I can confirm there is an error message when extacting a zip archive that contains an empty folder I logged an item on your behalf in order to investigate this unexpected behavior:
ZipLibrary: 7zip reports errors while extracting archive containing empty folders
. Please, make sure to subscribe to the task so we can notify you when its status changes.
On the other hand, with the sample project I created the archive could be successfully exported (even with the error message). The output can be seen in the attached "
observed.gif
"
As for setting the last modified date, you can check the ZipArchive entry`s
LastWriteTime
property. An example can be found in "
Example 4: Set last entry's write time
" in the
ZipArchive Entry
help article.
Regards,
Martin
Progress Telerik
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Attached Files:
observed.gif
The workaround code seems to have an issue: While empty folders do get added to the ZIP file, these do not get extracted when unzipping (neither with 7-ZIP nor with the Windows built-in ZIP extension). I also noted that folders added by this method do not have a "last modified" date in the ZIP file.
What needs to be done that empty folders added to a ZIP file also get extracted as empty folders?
Hi,
I have added a temporary solution for handling the cases when opening an existing zip with the ZipFile.Open method for example:
static void Main(string[] args)
string path = @"path-to-file.zip";
using (ZipArchive zip = OpenAndClose(path, ZipArchiveMode.Read))
foreach (var entry in zip.Entries)
if (entry.Name == "TemplateSample.docx")
entry.ExtractToFile(@"unzipped-file-name.docx", true);
File.Delete(path);
public static ZipArchive OpenAndClose(string archiveFileName, ZipArchiveMode mode, Encoding entryNameEncoding=null)
FileMode fileMode;
FileAccess fileAccess;
FileShare fileShare;
ZipArchive zipArchive;
switch (mode)
case ZipArchiveMode.Read:
fileMode = FileMode.Open;
fileAccess = FileAccess.Read;
fileShare = FileShare.Read;
break;
case ZipArchiveMode.Create:
fileMode = FileMode.CreateNew;
fileAccess = FileAccess.Write;
fileShare = FileShare.None;
break;
case ZipArchiveMode.Update:
fileMode = FileMode.OpenOrCreate;
fileAccess = FileAccess.ReadWrite;
fileShare = FileShare.None;
break;
default:
throw new ArgumentOutOfRangeException("mode");
FileStream fileStream = null;
fileStream = File.Open(archiveFileName, fileMode, fileAccess, fileShare);
bool leaveOpen = false;
zipArchive = new ZipArchive(fileStream, mode, leaveOpen, entryNameEncoding);
catch
if (fileStream != null)
fileStream.Dispose();
throw;
return zipArchive;
}
Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik
