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Trying to compress files from multiple folders

I have files stored in multiple different folders and I need to make a ZIP archive from all the files in those folders. I have created a simple function using System.IO.Compression, that takes the data from just one folder and makes a ZIP archive, but I can't figure out how to do that for multiple folders. No folders needed in ZIP, just the files from it.
If it can't be done in this library, I can use a different one like DotNetZip or similar.
string folder1 = #"c:\ex\ZipFolder1";
string zipPath = #"c:\ex\AllFiles.zip";
ZipFile.CreateFromDirectory(folder1, zipPath);

I think you're using DotNetZip.Just create a ZipFile and add files by the method AddFiles
using (var file = new ZipFile())
{
//fileNames is an array containing the paths of the files from differents folders
file.AddFiles(fileNames);
file.Save(zipFile);
}

Have you tried using AddFile() method of ZipFile Class. Here you can replace 'PathOfFiles' dynamically as per your requirement.
var fileNames = new string[] { "a.txt", "b.xlsx", "c.png" };
using (var zip = new ZipFile()){
foreach (var file in fileNames)
zip.AddFile(#"PathOfFiles\" + fileName, "");
zip.Name = "ZipFile";
var pushStreamContent = new PushStreamContent((stream, content, context) =>
{
zip.Save(stream);
stream.Close();
}, "application/zip");
}

for anyone encountering this today, here's an updated short and simple answer based on Microsoft's docs:
https://learn.microsoft.com/en-us/dotnet/api/system.io.compression.zipfileextensions.createentryfromfile?view=net-6.0
static void SaveFilesToZip(string zipTargetPath, string[] filePaths)
{
using var newZip = ZipFile.Open(zipTargetPath, ZipArchiveMode.Create);
foreach (var filePath in filePaths)
{
newZip.CreateEntryFromFile(filePath, Path.GetFileName(filePath));
}
}

Unzip .zip file from Assets folder to Internal Storage (Xamarin.Android)

So the question is pretty simple. I'm using Xamarin.Android and I have a zip file in the Assets folder named "MyZipFile.zip", which I want extracted to the following path: System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
It sounds simple enough, but I cannot figure out how to read the Asset into memory through the AssetManager and then unzip it at the targeted location.
Is there a simple way to do this?

The Android Java framework includes a Java.Util.Zip package, so without adding any additional app libraries, I directly use it instead of using C# framework code, thus no bloat that linking can not remove.
So basically you are creating an asset stream and feeding that to a ZipInputStream and iterating over each ZipEntry in that zip stream to either create directories or files to your destination path.
UnZipAssets
public void UnZipAssets(string assetName, string destPath)
{
byte[] buffer = new byte[1024];
int byteCount;
var destPathDir = new Java.IO.File(destPath);
destPathDir.Mkdirs();
using (var assetStream = Assets.Open(assetName, Android.Content.Res.Access.Streaming))
using (var zipStream = new ZipInputStream(assetStream))
{
ZipEntry zipEntry;
while ((zipEntry = zipStream.NextEntry) != null)
{
if (zipEntry.IsDirectory)
{
var zipDir = new Java.IO.File(Path.Combine(destPath, zipEntry.Name));
zipDir.Mkdirs();
continue;
}
// Note: This is deleting existing entries(!!!) for debug purposes only...
#if DEBUG
if (File.Exists(Path.Combine(destPath, zipEntry.Name)))
File.Delete(Path.Combine(destPath, zipEntry.Name));
#endif
using (var fileStream = new FileStream(Path.Combine(destPath, zipEntry.Name), FileMode.CreateNew))
{
while ((byteCount = zipStream.Read(buffer)) != -1)
{
fileStream.Write(buffer, 0, byteCount);
}
}
Log.Debug("UnZipAssets", zipEntry.Name);
zipEntry.Dispose();
}
}
}
Usage:
UnZipAssets("gameModLevels.zip", Path.Combine(Application.Context.CacheDir.AbsolutePath, "assets"));
Note: Even through the asset/zip steam is fast, depending upon number/size of the zip entries and the speed of the flash the entry is being written to, this should be done on a background thread as not to block UI thread and cause an ANR

Compress a single file using C#

I am using .NET 4.5, and the ZipFile class works great if I am trying to zip up an entire directory with "CreateFromDirectory". However, I only want to zip up one file in the directory. I tried pointing to a specific file (folder\data.txt), but that doesn't work. I considered the ZipArchive class since it has a "CreateEntryFromFile" method, but it seems this only allows you to create an entry into an existing file.
Is there no way to simply zip up one file without creating an empty zipfile (which has its issues) and then using the ZipArchiveExtension's "CreateEntryFromFile" method?
**This is also assuming I am working on a company program which cannot use third-party add-ons at the moment.
example from:http://msdn.microsoft.com/en-us/library/ms404280%28v=vs.110%29.aspx
string startPath = #"c:\example\start";
string zipPath = #"c:\example\result.zip";
string extractPath = #"c:\example\extract";
ZipFile.CreateFromDirectory(startPath, zipPath);
ZipFile.ExtractToDirectory(zipPath, extractPath);
But if startPath were to be #"c:\example\start\myFile.txt;", it would throw an error that the directory is invalid.

Use the CreateEntryFromFile off a an archive and use a file or memory stream:
Using a filestream if you are fine creating the zip file and then adding to it:
using (FileStream fs = new FileStream(#"C:\Temp\output.zip",FileMode.Create))
using (ZipArchive arch = new ZipArchive(fs, ZipArchiveMode.Create))
{
arch.CreateEntryFromFile(#"C:\Temp\data.xml", "data.xml");
}
Or if you need to do everything in memory and write the file once it is done, use a memory stream:
using (MemoryStream ms = new MemoryStream())
using (ZipArchive arch = new ZipArchive(ms, ZipArchiveMode.Create))
{
arch.CreateEntryFromFile(#"C:\Temp\data.xml", "data.xml");
}
Then you can write the MemoryStream to a file.
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write)) {
byte[] bytes = new byte[ms.Length];
ms.Read(bytes, 0, (int)ms.Length);
file.Write(bytes, 0, bytes.Length);
ms.Close();
}

Using file (or any) stream:
using (var zip = ZipFile.Open("file.zip", ZipArchiveMode.Create))
{
var entry = zip.CreateEntry("file.txt");
entry.LastWriteTime = DateTimeOffset.Now;
using (var stream= File.OpenRead(#"c:\path\to\file.txt"))
using (var entryStream = entry.Open())
stream.CopyTo(entryStream);
}
or briefer:
// reference System.IO.Compression
using (var zip = ZipFile.Open("file.zip", ZipArchiveMode.Create))
zip.CreateEntryFromFile("file.txt", "file.txt");
make sure you add references to System.IO.Compression
Update
Also, check out the new dotnet API documentation for ZipFile and ZipArchive too. There are a few examples there. There is also a warning about referencing System.IO.Compression.FileSystem to use ZipFile.
To use the ZipFile class, you must reference the
System.IO.Compression.FileSystem assembly in your project.

The simplest way to get this working is to use a temporary folder.
FOR ZIPPING:
Create a temp folder
Move file to folder
Zip folder
Delete folder
FOR UNZIPPING:
Unzip archive
Move file from temp folder to your location
Delete temp folder

In .NET, there are quite a few ways to tackle the problem, for a single file. If you don't want to learn everything there, you can get an abstracted library, like SharpZipLib (long standing open source library), sevenzipsharp (requires 7zip libs underneath) or DotNetZip.

just use following code for compressing a file.
public void Compressfile()
{
string fileName = "Text.txt";
string sourcePath = #"C:\SMSDBBACKUP";
DirectoryInfo di = new DirectoryInfo(sourcePath);
foreach (FileInfo fi in di.GetFiles())
{
//for specific file
if (fi.ToString() == fileName)
{
Compress(fi);
}
}
}
public static void Compress(FileInfo fi)
{
// Get the stream of the source file.
using (FileStream inFile = fi.OpenRead())
{
// Prevent compressing hidden and
// already compressed files.
if ((File.GetAttributes(fi.FullName)
& FileAttributes.Hidden)
!= FileAttributes.Hidden & fi.Extension != ".gz")
{
// Create the compressed file.
using (FileStream outFile =
File.Create(fi.FullName + ".gz"))
{
using (GZipStream Compress =
new GZipStream(outFile,
CompressionMode.Compress))
{
// Copy the source file into
// the compression stream.
inFile.CopyTo(Compress);
Console.WriteLine("Compressed {0} from {1} to {2} bytes.",
fi.Name, fi.Length.ToString(), outFile.Length.ToString());
}
}
}
}
}
}

Creating in-memory archive with multiple files [duplicate]

I know that the likes of the DotNetZip or SharpZipLib libraries are usually recommended for creating ZIP files in a .net language (C# in my case), but it's not impossible to use System.IO.Packaging to generate a ZIP file. I thought it might be nice to try and develop a routine in C# which could do it, without the need to download any external libraries. Does anyone have a good example of a method or methods that will use System.IO.Packaging to generate a ZIP file?

let me google this for you -> system.io.packaging+generate+zip
first link
http://weblogs.asp.net/jongalloway//creating-zip-archives-in-net-without-an-external-library-like-sharpziplib
using System;
using System.IO;
using System.IO.Packaging;
namespace ZipSample
{
class Program
{
static void Main(string[] args)
{
AddFileToZip("Output.zip", #"C:\Windows\Notepad.exe");
AddFileToZip("Output.zip", #"C:\Windows\System32\Calc.exe");
}
private static void AddFileToZip(string zipFilename, string fileToAdd, CompressionOption compression = CompressionOption.Normal)
{
using (Package zip = System.IO.Packaging.Package.Open(zipFilename, FileMode.OpenOrCreate))
{
string destFilename = ".\\" + Path.GetFileName(fileToAdd);
Uri uri = PackUriHelper.CreatePartUri(new Uri(destFilename, UriKind.Relative));
if (zip.PartExists(uri))
{
zip.DeletePart(uri);
}
PackagePart part = zip.CreatePart(uri, "", compression);
using (FileStream fileStream = new FileStream(fileToAdd, FileMode.Open, FileAccess.Read))
{
using (Stream dest = part.GetStream())
{
fileStream.CopyTo(dest);
}
}
}
}
}
}

In .NET Framework 4.5 you can use the new classes in the System.IO.Compression namespace.

Using System.IO.Packaging to generate a ZIP file

I know that the likes of the DotNetZip or SharpZipLib libraries are usually recommended for creating ZIP files in a .net language (C# in my case), but it's not impossible to use System.IO.Packaging to generate a ZIP file. I thought it might be nice to try and develop a routine in C# which could do it, without the need to download any external libraries. Does anyone have a good example of a method or methods that will use System.IO.Packaging to generate a ZIP file?

let me google this for you -> system.io.packaging+generate+zip
first link
http://weblogs.asp.net/jongalloway//creating-zip-archives-in-net-without-an-external-library-like-sharpziplib
using System;
using System.IO;
using System.IO.Packaging;
namespace ZipSample
{
class Program
{
static void Main(string[] args)
{
AddFileToZip("Output.zip", #"C:\Windows\Notepad.exe");
AddFileToZip("Output.zip", #"C:\Windows\System32\Calc.exe");
}
private static void AddFileToZip(string zipFilename, string fileToAdd, CompressionOption compression = CompressionOption.Normal)
{
using (Package zip = System.IO.Packaging.Package.Open(zipFilename, FileMode.OpenOrCreate))
{
string destFilename = ".\\" + Path.GetFileName(fileToAdd);
Uri uri = PackUriHelper.CreatePartUri(new Uri(destFilename, UriKind.Relative));
if (zip.PartExists(uri))
{
zip.DeletePart(uri);
}
PackagePart part = zip.CreatePart(uri, "", compression);
using (FileStream fileStream = new FileStream(fileToAdd, FileMode.Open, FileAccess.Read))
{
using (Stream dest = part.GetStream())
{
fileStream.CopyTo(dest);
}
}
}
}
}
}

In .NET Framework 4.5 you can use the new classes in the System.IO.Compression namespace.