How Can I Create and Manage ZIP Files Natively in C#?

ZIP Files in C# Natively

In the realm of file compression, ZIP archives reign supreme. However, relying on third-party libraries can sometimes be cumbersome or lead to dependency issues. Fortunately, C# offers native capabilities for ZIP operations without the need for any external dependencies.

Creating ZIP Archives

To create a ZIP archive using the .NET Framework 4.5 , utilize the ZipArchive and ZipFile classes. For instance:

using (ZipArchive zip = ZipFile.Open("test.zip", ZipArchiveMode.Create))
{
    zip.CreateEntryFromFile(@"c:\something.txt", "data/path/something.txt");
}

Remember to include references to the System.IO.Compression and System.IO.Compression.FileSystem namespaces.

For .NET Core targeting net46, explicitly add dependencies for the following packages in your project.json file:

"dependencies": {
  "System.IO.Compression": "4.1.0",
  "System.IO.Compression.ZipFile": "4.0.1"
},

In .NET Core 2.0 and above, simply include the following using statement to access the necessary classes:

using System.IO.Compression;

Zipping Collections of Documents

To address the user requirement of downloading multiple documents in a single request, creating a ZIP archive containing all the desired files is the most suitable solution. This can be accomplished using the same principles discussed earlier. By looping through the collection of documents, you can iteratively add them to the ZIP archive, effectively compressing them into a single downloadable file.

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