We Keep Coding

Fast way to add a single file to a large ZIP file using C#

I have a large zip file (let's say 10 GB), to which I want to add a single small file (let's say 50 KB). I'm using the following code:
using System.IO.Compression;
using (var targetZip = ZipFile.Open(largeZipFilePath), ZipArchiveMode.Update)
{
targetZip.CreateEntryFromFile(smallFilePath, "foobar");
}
While this works (eventually), it takes a very long time and consumes a ludicrous amount of memory. It seems to extract and recompress the whole archive.
How can I improve this in .Net 4.7? Solution without external dependencies is preferred, but not required if impossible.

use visual studio nuget package manager and install that
Install-Package DotNetZip -Version 1.11.0
using (ZipFile zip = new ZipFile())
{
zip.AddFile("ReadMe.txt"); // no password for this one
zip.Password= "123456!";
zip.AddFile("7440-N49th.png");
zip.Password= "!Secret1";
zip.AddFile("2005_Annual_Report.pdf");
zip.Save("Backup.zip");
}
https://www.nuget.org/packages/DotNetZip/

Since you are in above .NET 4.5, you can use the ZipArchive (System.IO.Compression) class to achieve this. Here is the MSDN documentation: (MSDN).
Here is their example, it just writes text, but you could read in a .csv file and write it out to your new file. To just copy the file in, you would use CreateFileFromEntry, which is an extension method for ZipArchive.
using (FileStream zipToOpen = new FileStream(#"c:\users\exampleuser\release.zip", FileMode.Open))
{
using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update))
{
ZipArchiveEntry readmeEntry = archive.CreateEntry("Readme.txt");
using (StreamWriter writer = new StreamWriter(readmeEntry.Open()))
{
writer.WriteLine("Information about this package.");
writer.WriteLine("========================");
}
}
}
Check this:- https://stackoverflow.com/a/22339337/9912441
https://learn.microsoft.com/en-us/dotnet/standard/io/how-to-compress-and-extract-files

I found the reason for this behaviour in another Stack Overflow answer: Out of memory exception while updating zip in c#.net.
The gist of it is that this takes a long time because ZipArchiveMode.Update caches the zip file into memory. The suggestion for avoiding this caching behaviour is to create a new archive, and copy the old archive contents along with the new file to it.
See the MSDN documentation which explains how ZipArchiveMode.Update behaves:

programmatically Move and Check in local file to Sharepoint C#

Below is code I am using to programmatically move a local file from D: to sharepoint library. I am able to move the file, but it does not check the file into sharepoint. I am unsure how to check this file in. Has anyone had similar issues with sharepoint? Thanks.
Here is my code, I did not use the exact destination and source urls, so ignore that. It compiles and runs fine and it can be used to move a file from lets say D: to My documents, it jsut does not check the file into sharepoint.
Also I am checking in an excel sheet that performs a number of calculation based on data updated daily. The calculations are done through a macro. Is it possible to write a macro to upload automatically to sharepoint library and check in? if so i can add this to the macro already in place instead of using c#. Thanks.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using Microsoft.SharePoint.WorkflowServices;
using Microsoft.SharePoint.Client;
using Microsoft.SharePoint;
using System.Net;
namespace defectUpload
{
class Program
{
static void Main(string[] args)
{
string fileName = "WS2016.xlsm";
string sourcePath = # source path "";
string targetPath = # destination path "" ;
// Use Path class to manipulate file and directory paths.
string sourceFile = System.IO.Path.Combine(sourcePath, fileName);
string destFile = System.IO.Path.Combine(targetPath, fileName);
// To copy a folder's contents to a new location:
// Create a new target folder, if necessary.
if (!System.IO.Directory.Exists(targetPath))
{
System.IO.Directory.CreateDirectory(targetPath);
}
System.IO.File.Move(sourceFile, destFile);
}
}
}

This was already solved in this post https://sharepoint.stackexchange.com/questions/133197/excel-vba-code-to-upload-document-into-sharepoint-online-2013
Dim SharepointAddress As String
Dim LocalAddress As String
Dim objNet As Object
Dim FS As Object
' Where you will enter Sharepoint location path
SharepointAddress = "\\sharepoint path to document library" & "\"
' Where you will enter the file path, ex: Excel file
LocalAddress = "your file path"
Set objNet = CreateObject("WScript.Network")
Set FS = CreateObject("Scripting.FileSystemObject")
If FS.FileExists(LocalAddress) Then
FS.CopyFile LocalAddress, SharepointAddress
End If
Set objNet = Nothing
Set FS = Nothing
And also a good article on MSDN on this topic Using Microsoft Windows SharePoint Services with the Microsoft Office System.
There are also a lot of samples when you google for example for "vba upload to sharepoint"...

Link to local text file in Solution c#

I need to save a set of 20 txt files into my solution so they will be included into the exe file. In such a way I will be able to send to the final users only the executable file and anything else.
I need to use the following function:
File.Copy( sourcePath, #path + "\\FileName.txt");
to copy one of the 20 files into another directory (according to the request of the user). In order to include the 20 txt files into the solution, I created a new folder into the Solution Explorer and I put them into it. Then I selected "Resources" into the option of the single txt file. Let's suppose the name of the folder is FOO and the file is NAME01, then I'm assuming the local address of the single txt file is "\FOO\NAME01.txt". But this is not working, I'm getting an arror from the File.Copy function related to the sourcePath.
Do you have any suggestions? I'm stacked on this problem and I cannot find any solution on the web. Many thanks!

Step 1: add the files to your project
Step 2: make them embedded resource
Step 3: export them to filesystem at runtime:
using System.Reflection;
namespace ConsoleApplication1
{
class Program4
{
public static void Main(string[] args)
{
using(var stream = Assembly.GetExecutingAssembly()
.GetManifestResourceStream("ConsoleApplication1.Files.TextFile1.txt"))
using (var filestream = System.IO.File.OpenWrite("target.txt"))
{
stream.CopyTo(filestream);
filestream.Flush();
filestream.Close();
stream.Close();
}
}
}
}
"ConsoleApplication1.Files.TextFile1.txt" comes from:
ConsoleApplication1: default namespace of the project containing the files
Files.TextFile1.txt: relative path, dotted, inside the dll (look # screenshot 1)

C# how do I draw on files in the same location as i'm running the program without a long path

So far I haven't found anything that would allow my program to access text files that are in the same folder as it.
for example:
if my file is in C:/testingfolder i would need to use C:/testingfolder/filenames.txt to access the other files, the problem with this is sometimes it wont be in c:/testingfolder but instead it might be in E:/importantfiles or F:/backup and it needs to run from all of those.
If anyone could explain or give code that showed how to make a longer path into a "same folder" path that would answer my question.

With the Environment.CurrentDirectory you can get the path of your process that is executing, then you should use System.IO.Path.Combine() method to concatenate this path with the name of your file, and you will get the absolute location of your file.

You need to use System.IO and System.Text
using System;
using System.IO;
using System.Text;
then
static void Main(string[] args)
{
string line = "";
// look for the file "myfile.txt" in application root directory
using (StreamReader sr = new StreamReader("myfile.txt"))
{
while ((line = sr.ReadLine()) != null)
{
Console.WriteLine(line);
}
}
Console.ReadKey();
}

Zipping Directory using zlib [duplicate]

What is an example (simple code) of how to zip a folder in C#?
Update:
I do not see namespace ICSharpCode. I downloaded ICSharpCode.SharpZipLib.dll but I do not know where to copy that DLL file. What do I need to do to see this namespace?
And do you have link for that MSDN example for compress folder, because I read all MSDN but I couldn't find anything.
OK, but I need next information.
Where should I copy ICSharpCode.SharpZipLib.dll to see that namespace in Visual Studio?

This answer changes with .NET 4.5. Creating a zip file becomes incredibly easy. No third-party libraries will be required.
string startPath = #"c:\example\start";
string zipPath = #"c:\example\result.zip";
string extractPath = #"c:\example\extract";
ZipFile.CreateFromDirectory(startPath, zipPath);
ZipFile.ExtractToDirectory(zipPath, extractPath);

From the DotNetZip help file, http://dotnetzip.codeplex.com/releases/
using (ZipFile zip = new ZipFile())
{
zip.UseUnicodeAsNecessary= true; // utf-8
zip.AddDirectory(#"MyDocuments\ProjectX");
zip.Comment = "This zip was created at " + System.DateTime.Now.ToString("G") ;
zip.Save(pathToSaveZipFile);
}

There's nothing in the BCL to do this for you, but there are two great libraries for .NET which do support the functionality.
SharpZipLib
DotNetZip
I've used both and can say that the two are very complete and have well-designed APIs, so it's mainly a matter of personal preference.
I'm not sure whether they explicitly support adding Folders rather than just individual files to zip files, but it should be quite easy to create something that recursively iterated over a directory and its sub-directories using the DirectoryInfo and FileInfo classes.

In .NET 4.5 the ZipFile.CreateFromDirectory(startPath, zipPath); method does not cover a scenario where you wish to zip a number of files and sub-folders without having to put them within a folder. This is valid when you wish the unzip to put the files directly within the current folder.
This code worked for me:
public static class FileExtensions
{
public static IEnumerable<FileSystemInfo> AllFilesAndFolders(this DirectoryInfo dir)
{
foreach (var f in dir.GetFiles())
yield return f;
foreach (var d in dir.GetDirectories())
{
yield return d;
foreach (var o in AllFilesAndFolders(d))
yield return o;
}
}
}
void Test()
{
DirectoryInfo from = new DirectoryInfo(#"C:\Test");
using (var zipToOpen = new FileStream(#"Test.zip", FileMode.Create))
{
using (var archive = new ZipArchive(zipToOpen, ZipArchiveMode.Create))
{
foreach (var file in from.AllFilesAndFolders().OfType<FileInfo>())
{
var relPath = file.FullName.Substring(from.FullName.Length+1);
ZipArchiveEntry readmeEntry = archive.CreateEntryFromFile(file.FullName, relPath);
}
}
}
}
Folders don't need to be "created" in the zip-archive. The second parameter "entryName" in CreateEntryFromFile should be a relative path, and when unpacking the zip-file the directories of the relative paths will be detected and created.

There is a ZipPackage class in the System.IO.Packaging namespace which is built into .NET 3, 3.5, and 4.0.
http://msdn.microsoft.com/en-us/library/system.io.packaging.zippackage.aspx
Here is an example how to use it.
http://www.codeproject.com/KB/files/ZipUnZipTool.aspx?display=Print

There's an article over on MSDN that has a sample application for zipping and unzipping files and folders purely in C#. I've been using some of the classes in that successfully for a long time. The code is released under the Microsoft Permissive License, if you need to know that sort of thing.
EDIT: Thanks to Cheeso for pointing out that I'm a bit behind the times. The MSDN example I pointed to is in fact using DotNetZip and is really very fully-featured these days. Based on my experience of a previous version of this I'd happily recommend it.
SharpZipLib is also quite a mature library and is highly rated by people, and is available under the GPL license. It really depends on your zipping needs and how you view the license terms for each of them.
Rich

using DotNetZip (available as nuget package):
public void Zip(string source, string destination)
{
using (ZipFile zip = new ZipFile
{
CompressionLevel = CompressionLevel.BestCompression
})
{
var files = Directory.GetFiles(source, "*",
SearchOption.AllDirectories).
Where(f => Path.GetExtension(f).
ToLowerInvariant() != ".zip").ToArray();
foreach (var f in files)
{
zip.AddFile(f, GetCleanFolderName(source, f));
}
var destinationFilename = destination;
if (Directory.Exists(destination) && !destination.EndsWith(".zip"))
{
destinationFilename += $"\\{new DirectoryInfo(source).Name}-{DateTime.Now:yyyy-MM-dd-HH-mm-ss-ffffff}.zip";
}
zip.Save(destinationFilename);
}
}
private string GetCleanFolderName(string source, string filepath)
{
if (string.IsNullOrWhiteSpace(filepath))
{
return string.Empty;
}
var result = filepath.Substring(source.Length);
if (result.StartsWith("\\"))
{
result = result.Substring(1);
}
result = result.Substring(0, result.Length - new FileInfo(filepath).Name.Length);
return result;
}
Usage:
Zip(#"c:\somefolder\subfolder\source", #"c:\somefolder2\subfolder2\dest");
Or
Zip(#"c:\somefolder\subfolder\source", #"c:\somefolder2\subfolder2\dest\output.zip");

Following code uses a third-party ZIP component from Rebex:
// add content of the local directory C:\Data\
// to the root directory in the ZIP archive
// (ZIP archive C:\archive.zip doesn't have to exist)
Rebex.IO.Compression.ZipArchive.Add(#"C:\archive.zip", #"C:\Data\*", "");
Or if you want to add more folders without need to open and close archive multiple times:
using Rebex.IO.Compression;
...
// open the ZIP archive from an existing file
ZipArchive zip = new ZipArchive(#"C:\archive.zip", ArchiveOpenMode.OpenOrCreate);
// add first folder
zip.Add(#"c:\first\folder\*","\first\folder");
// add second folder
zip.Add(#"c:\second\folder\*","\second\folder");
// close the archive
zip.Close(ArchiveSaveAction.Auto);
You can download the ZIP component here.
Using a free, LGPL licensed SharpZipLib is a common alternative.
Disclaimer: I work for Rebex

"Where should I copy ICSharpCode.SharpZipLib.dll to see that namespace in Visual Studio?"
You need to add the dll file as a reference in your project. Right click on References in the Solution Explorer->Add Reference->Browse and then select the dll.
Finally you'll need to add it as a using statement in whatever files you want to use it in.

ComponentPro ZIP can help you achieve that task. The following code snippet compress files and dirs in a folder. You can use wilcard mask as well.
using ComponentPro.Compression;
using ComponentPro.IO;
...
// Create a new instance.
Zip zip = new Zip();
// Create a new zip file.
zip.Create("test.zip");
zip.Add(#"D:\Temp\Abc"); // Add entire D:\Temp\Abc folder to the archive.
// Add all files and subdirectories from 'c:\test' to the archive.
zip.AddFiles(#"c:\test");
// Add all files and subdirectories from 'c:\my folder' to the archive.
zip.AddFiles(#"c:\my folder", "");
// Add all files and subdirectories from 'c:\my folder' to '22' folder within the archive.
zip.AddFiles(#"c:\my folder2", "22");
// Add all .dat files from 'c:\my folder' to '22' folder within the archive.
zip.AddFiles(#"c:\my folder2", "22", "*.dat");
// Or simply use this to add all .dat files from 'c:\my folder' to '22' folder within the archive.
zip.AddFiles(#"c:\my folder2\*.dat", "22");
// Add *.dat and *.exe files from 'c:\my folder' to '22' folder within the archive.
zip.AddFiles(#"c:\my folder2\*.dat;*.exe", "22");
TransferOptions opt = new TransferOptions();
// Donot add empty directories.
opt.CreateEmptyDirectories = false;
zip.AddFiles(#"c:\abc", "/", opt);
// Close the zip file.
zip.Close();
http://www.componentpro.com/doc/zip has more examples