using System.IO.Compression; // Create a new ZIP archive using var archive = new ZipArchive(File.Create("example.zip"), ZipArchiveMode.Create); // Add a file to the archive var entry = archive.CreateEntryFromFile("path/to/file.txt", "file.txt");
using System.IO.Compression; // Open an existing ZIP archive using var archive = ZipFile.Open("example.zip", ZipArchiveMode.Update); // Update an existing entry in the archive var entry = archive.GetEntry("file.txt"); if (entry != null) { entry.Delete(); archive.CreateEntryFromFile("path/to/updated-file.txt", "file.txt"); }This example opens an existing ZIP archive using the ZipFile.Open method and updates an existing entry named "file.txt". The code first deletes the old entry using the Entry.Delete method and then creates a new entry from a different file using the CreateEntryFromFile method. Package library: The System.IO.Compression namespace is part of the .NET Standard library, which is included in the base class libraries of most .NET platforms, including .NET Framework, .NET Core, and Xamarin.