How to Create ZIP File From Multiple Files in C#

Updated January 27, 2024

In the realm of C# programming, ZIP files emerge as indispensable assets, providing developers with a versatile and efficient mechanism for compressing and organizing an extensive array of files into a cohesive archive.

Beyond their fundamental role in conserving valuable storage space, ZIP files become catalysts for enhancing the overall efficiency of the file distribution process. By seamlessly bundling numerous files into a unified container, developers can significantly streamline the deployment and sharing of their applications, libraries, or other project components. This makes the creation of ZIP files and unzipping files an incredibly important aspect of file storage for developers.

ZIP files, with their compressed format, not only contribute to a more economical use of storage resources but also expedite the transmission of data, especially when dealing with large or intricate projects. This compression not only reduces the physical footprint of files but also accelerates the transfer speed, optimizing the overall performance of applications. As a result, developers can (in C#) create ZIP files from multiple files using the C# ZIP Library. You can learn more about this here.

In this article, we will delve into the significance of ZIP files in C# programming and explore how the C# ZIP library IronZIP can streamline the process of creating ZIP files from multiple files.

1. How to Create ZIP Files From Multiple Files

  1. Create a new C# console application project in Visual Studio.
  2. Install the C# ZIP Creation library IronZIP using NuGet Package Manager.
  3. Import the necessary dependencies.
  4. Create an archive object using IronZipArchive.
  5. Add the files to the archive object using the archive.Add method.
  6. Save the ZIP file using the SaveAs method.

Introducing IronZIP

IronZIP is a cutting-edge file compression and archiving software that stands out for its robust features and user-friendly interface. As a powerful compression tool, IronZIP excels in efficiently reducing the size of files and folders, making it ideal for users who need to save storage space or transfer large amounts of data quickly.

The software supports a wide range of compression formats, including popular ones like ZIP, TAR, GZIP, BZIP2, and more, ensuring compatibility with various platforms and applications. One standout feature of IronZIP is its advanced encryption capabilities, providing users with a secure way to protect their compressed files and sensitive data.

The software integrates strong encryption algorithms, such as AES (Advanced Encryption Standard), allowing users to set password protection and control access to their archived content. Additionally, IronZIP boasts an intuitive and user-friendly interface, making it accessible to both novice and experienced users.

Its drag-and-drop functionality, batch processing capabilities, and multi-threaded compression ensure a seamless and efficient user experience. Whether you're a casual user looking to save space or a professional handling large data sets, IronZIP emerges as a versatile and reliable solution for all your file compression and archiving needs.

Setting Up the Environment

To get started with IronZIP, the first step is to set up your development environment. For this example, we'll create a new Visual Studio project. Open Visual Studio and create a new C# project. Once the project is created, the next step is to install the IronZIP library. IronZIP can be easily installed using NuGet Package Manager.

  1. In Visual Studio, go to the Tools menu and hover over "NuGet Package Manager".
  2. A new side menu will appear. Click on "NuGet Package Manager for Solutions".

    How to Create ZIP File From Multiple Files in C#: Figure 1 - How to reach the NuGet Package Manager for Solutions

  3. A new window will appear. In the new window, go to the "Browse" tab and search for "IronZIP" in the search bar.
  4. Select the IronZIP package and click on "Install".

    How to Create ZIP File From Multiple Files in C#: Figure 2 - IronZIP package as viewed in the NuGet package manager

Just like that, IronZIP is installed. You can also download IronZIP directly from the IronZIP NuGet Page.

Creating a ZIP File with Multiple Files Using IronZIP

Now that IronZIP is integrated into your project, let's explore a simple example of creating a ZIP file from multiple files. For this demonstration, we'll assume you have to add one PDF, one Excel, and one DOCX file that you want to include in the ZIP archive. The IronZIP library provides a straightforward API for achieving this task by archiving all the files into a single ZIP file system.

  1. Using Directive:

    using IronZip;
    using IronZip;
    Imports IronZip
    VB   C#

    This line includes the IronZIP namespace in the code, allowing the usage of classes and functionalities provided by the IronZIP library.

  2. Creating an Empty ZIP Archive:

    using (var archive = new IronZipArchive())
    using (var archive = new IronZipArchive())
    Using archive = New IronZipArchive()
    VB   C#

    It creates an instance of the IronZipArchive class, which represents an empty ZIP archive. The using statement ensures that the archive object is properly disposed of when it goes out of scope.

  3. Adding Files to the ZIP Archive:

    VB   C#

    This section adds three files and their respective string names ("Invoice.pdf," "example_workbook.xlsx," and "example.docx") to the ZIP archive using the Add method. These files will be compressed and stored within the created ZIP archive.

  4. Saving the ZIP Archive

    VB   C#

Finally, the SaveAs method is called on the archive object to save the ZIP archive. The argument "" holds the specified directory and file name for the resulting ZIP file. This file will contain the compressed versions of the added files.

How to Create ZIP File From Multiple Files in C#: Figure 3 - Output ZIP file and files within a temp folder in the ZIP file


In conclusion, ZIP files play a pivotal role in C# programming, offering an efficient way to compress files and manage multiple files. The use of libraries such as IronZIP further enhances the capabilities of developers, providing a seamless and powerful solution for ZIP file manipulation. Setting up the environment is a straightforward process, and integrating IronZIP into your Visual Studio project opens up a world of possibilities for handling ZIP archives.

The provided code example illustrates how easily you can create a ZIP file from multiple files, showcasing the simplicity and effectiveness of IronZIP in enhancing file management in C# applications. Whether you're working on a file compression utility or need to streamline file distribution, IronZIP proves to be a valuable tool in your C# development toolkit.

IronZIP is one of the best C# ZIP libraries out there with detailed documentation and code examples of every feature. The code tutorial for creating a ZIP file is available at the following link.

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