如何在 C# 中提取 ZIP 文件

Apply License Key

Ensure you have a valid license or trial key for IronZIP. Apply the license key by assigning it to the LicenseKey property of the License class. Include the following code immediately after the import statement and before using any IronZIP methods:

IronZIP.Licensing.License.LicenseKey = "IRONZIP.MYLICENSE.KEY.1EF01";

IronZIP.Licensing.License.LicenseKey = "IRONZIP.MYLICENSE.KEY.1EF01";

IronZIP.Licensing.License.LicenseKey = "IRONZIP.MYLICENSE.KEY.1EF01"

This step is crucial for unleashing the full potential of IronZIP in your project.

Extract a Zip file using C#

The following code sample will unzip files into a new directory using IronZIP.

using IronZIP;

namespace CS_ZipArchive
{
    internal class Program
    {
        public static void Main(string[] args)
        {       
            // Extract the contents of "QRCode.zip" into the "Extracted QRCode" directory
            IronArchive.ExtractArchiveToDirectory("QRCode.zip", "Extracted QRCode");
        }
     }
}

using IronZIP;

namespace CS_ZipArchive
{
    internal class Program
    {
        public static void Main(string[] args)
        {       
            // Extract the contents of "QRCode.zip" into the "Extracted QRCode" directory
            IronArchive.ExtractArchiveToDirectory("QRCode.zip", "Extracted QRCode");
        }
     }
}

Imports IronZIP

Namespace CS_ZipArchive
	Friend Class Program
		Public Shared Sub Main(ByVal args() As String)
			' Extract the contents of "QRCode.zip" into the "Extracted QRCode" directory
			IronArchive.ExtractArchiveToDirectory("QRCode.zip", "Extracted QRCode")
		End Sub
	End Class
End Namespace

The above code uses the IronZIP library, which provides functionality for working with ZIP archives in C#. This line aims to extract the contents of a ZIP archive file named "QRCode.zip" and save them to a directory named "Extracted QRCode". The ExtractArchiveToDirectory() method is responsible for extracting the contents of a ZIP archive. It takes two arguments: the source file and the destination.

Create a New Ziparchive from the Existing File System

We can create a new zip archive from a specified zip file. As shown below, we can add multiple files with different formats, such as images and PDFs.

using IronZIP;

namespace CS_ZipArchive
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Create a new ZIP file named "new PDF Files.zip" by extracting content from "myPDFFiles.zip"
            using (var archive = IronArchive.FromFile("myPDFFiles.zip", "new PDF Files.zip"))
            {
                // Add files to the archive
                archive.Add(@"D:\Invoices\Image1.png");
                archive.Add(@"D:\Invoices\PDF3.pdf");
            }
        }
    }
}

using IronZIP;

namespace CS_ZipArchive
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Create a new ZIP file named "new PDF Files.zip" by extracting content from "myPDFFiles.zip"
            using (var archive = IronArchive.FromFile("myPDFFiles.zip", "new PDF Files.zip"))
            {
                // Add files to the archive
                archive.Add(@"D:\Invoices\Image1.png");
                archive.Add(@"D:\Invoices\PDF3.pdf");
            }
        }
    }
}

Imports IronZIP

Namespace CS_ZipArchive
	Friend Class Program
		Shared Sub Main(ByVal args() As String)
			' Create a new ZIP file named "new PDF Files.zip" by extracting content from "myPDFFiles.zip"
			Using archive = IronArchive.FromFile("myPDFFiles.zip", "new PDF Files.zip")
				' Add files to the archive
				archive.Add("D:\Invoices\Image1.png")
				archive.Add("D:\Invoices\PDF3.pdf")
			End Using
		End Sub
	End Class
End Namespace

This C# code snippet utilizes IronArchive to create a new ZIP file named "new PDF Files.zip" by extracting content from an existing ZIP file called "myPDFFiles.zip." Inside the using block, files like "Image1.png" and "PDF3.pdf" are added to the new ZIP archive. The code efficiently extracts and adds specific files from one archive to another using IronArchive.

Introducing IronPDF

IronPDF is a popular C# library that equips developers to work seamlessly with PDF files in their .NET framework applications. Beyond its compression capabilities, it offers diverse PDF generation, manipulation, conversion, and more features. This flexibility makes it an invaluable tool for various PDF-related tasks. Whether creating PDFs from scratch, converting data from HTML to PDF, or engaging in other PDF operations, IronPDF simplifies the entire process, enhancing productivity for C# developers.

Install IronPDF NuGet Package

To incorporate IronPDF into your project, execute the following command to install IronPDF.

Install-Package IronZip

This command streamlines the installation process and adds the necessary dependencies to your project, ensuring a smooth integration.

Write Code to Compress PDF File in C#

We're focusing on PDF compression in the provided C# code snippet.

using IronPdf;

public static void CompressPdf()
{
    // Open the PDF document located at D:\SamplePDFFile.pdf
    var pdf = new PdfDocument(@"D:\SamplePDFFile.pdf");

    // Compress the images in the PDF document to 60% of their original quality
    pdf.CompressImages(60);

    // Save the compressed PDF as a new file
    pdf.SaveAs(@"D:\CompressedPDF.pdf");
}

using IronPdf;

public static void CompressPdf()
{
    // Open the PDF document located at D:\SamplePDFFile.pdf
    var pdf = new PdfDocument(@"D:\SamplePDFFile.pdf");

    // Compress the images in the PDF document to 60% of their original quality
    pdf.CompressImages(60);

    // Save the compressed PDF as a new file
    pdf.SaveAs(@"D:\CompressedPDF.pdf");
}

Imports IronPdf

Public Shared Sub CompressPdf()
	' Open the PDF document located at D:\SamplePDFFile.pdf
	Dim pdf = New PdfDocument("D:\SamplePDFFile.pdf")

	' Compress the images in the PDF document to 60% of their original quality
	pdf.CompressImages(60)

	' Save the compressed PDF as a new file
	pdf.SaveAs("D:\CompressedPDF.pdf")
End Sub

In the above C# code, we have opened a PDF document named "SamplePDFFile.pdf"; its images are compressed to 60% of their original quality. The resulting compressed PDF file is then saved as "CompressedPDF.pdf" at the specified folder location.

Further, you can use the System namespace (using System) since it provides essential classes and methods for basic functionalities in C# applications. Using the ZipArchive class, part of the System.IO.Compression namespace, you can deal with compressed files as it allows seamless extraction and manipulation of zipped files, ensuring efficient handling of compressed data. In the context of this PDF compression example, understanding and utilizing the System namespace and the IronPDF library demonstrate the versatility and power of C# in managing diverse file formats, like zipped files, gz files, or PDFs.