Sharpziplib 提取 ZIP C#（對於開發者的運行原理）

using ICSharpCode.SharpZipLib.Zip;
using System;
using System.IO;

namespace SharpZipLibExample
{
    class Program
    {
        static void Main(string[] args)
        {
            string sourceDirectory = @"C:\SourceDirectory";     // Source directory containing files to compress
            string zipFilePath = @"C:\OutputDirectory\compressed.zip"; // Output path for the compressed ZIP file

            // Compress files from the source directory
            CompressDirectory(sourceDirectory, zipFilePath);
            Console.WriteLine("Files compressed successfully.");

            string extractPath = @"C:\OutputDirectory\extracted"; // Path to extract the decompressed files

            // Decompress files from the ZIP archive
            Decompress(zipFilePath, extractPath);
            Console.WriteLine("Files decompressed successfully.");
        }

        // Method to compress all files in a directory to a ZIP file
        static void CompressDirectory(string sourceDirectory, string zipFilePath)
        {
            using (var zipOutputStream = new ZipOutputStream(File.Create(zipFilePath)))
            {
                zipOutputStream.SetLevel(5); // Set compression level (0-9), 5 as a mid-range

                // Recursively add files in the source directory to the ZIP file
                AddDirectoryFilesToZip(sourceDirectory, zipOutputStream);

                zipOutputStream.Finish();
                zipOutputStream.Close();
            }
        }

        // Method to add files from a directory to a ZIP output stream
        static void AddDirectoryFilesToZip(string sourceDirectory, ZipOutputStream zipOutputStream)
        {
            // Get list of files in the directory
            string[] files = Directory.GetFiles(sourceDirectory);

            foreach (string file in files)
            {
                var entry = new ZipEntry(Path.GetFileName(file)); // Create a new entry for each file
                zipOutputStream.PutNextEntry(entry);

                using (var fileStream = File.OpenRead(file))
                {
                    // Buffer for reading files
                    byte[] buffer = new byte[4096];
                    int sourceBytes;

                    // Read file and write to ZIP stream
                    while ((sourceBytes = fileStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        zipOutputStream.Write(buffer, 0, sourceBytes);
                    }
                }
            }

            // Handle subdirectories recursively
            string[] subdirectories = Directory.GetDirectories(sourceDirectory);
            foreach (string subdirectory in subdirectories)
            {
                AddDirectoryFilesToZip(subdirectory, zipOutputStream);
            }
        }

        // Method to decompress files from a ZIP file
        static void Decompress(string zipFilePath, string extractPath)
        {
            using (var zipInputStream = new ZipInputStream(File.OpenRead(zipFilePath)))
            {
                ZipEntry entry;
                // Read entries from the ZIP archive
                while ((entry = zipInputStream.GetNextEntry()) != null)
                {
                    string entryPath = Path.Combine(extractPath, entry.Name);

                    // Process files
                    if (entry.IsFile)
                    {
                        string directoryName = Path.GetDirectoryName(entryPath);
                        if (!Directory.Exists(directoryName))
                            Directory.CreateDirectory(directoryName);

                        using (var fileStream = File.Create(entryPath))
                        {
                            // Buffer for reading entries
                            byte[] buffer = new byte[4096];
                            int bytesRead;
                            // Read from ZIP stream and write to file
                            while ((bytesRead = zipInputStream.Read(buffer, 0, buffer.Length)) > 0)
                            {
                                fileStream.Write(buffer, 0, bytesRead);
                            }
                        }
                    }
                    else if (entry.IsDirectory) // Process directories
                    {
                        Directory.CreateDirectory(entryPath);
                    }
                }
            }
        }
    }
}

Imports ICSharpCode.SharpZipLib.Zip
Imports System
Imports System.IO

Namespace SharpZipLibExample
	Friend Class Program
		Shared Sub Main(ByVal args() As String)
			Dim sourceDirectory As String = "C:\SourceDirectory" ' Source directory containing files to compress
			Dim zipFilePath As String = "C:\OutputDirectory\compressed.zip" ' Output path for the compressed ZIP file

			' Compress files from the source directory
			CompressDirectory(sourceDirectory, zipFilePath)
			Console.WriteLine("Files compressed successfully.")

			Dim extractPath As String = "C:\OutputDirectory\extracted" ' Path to extract the decompressed files

			' Decompress files from the ZIP archive
			Decompress(zipFilePath, extractPath)
			Console.WriteLine("Files decompressed successfully.")
		End Sub

		' Method to compress all files in a directory to a ZIP file
		Private Shared Sub CompressDirectory(ByVal sourceDirectory As String, ByVal zipFilePath As String)
			Using zipOutputStream As New ZipOutputStream(File.Create(zipFilePath))
				zipOutputStream.SetLevel(5) ' Set compression level (0-9), 5 as a mid-range

				' Recursively add files in the source directory to the ZIP file
				AddDirectoryFilesToZip(sourceDirectory, zipOutputStream)

				zipOutputStream.Finish()
				zipOutputStream.Close()
			End Using
		End Sub

		' Method to add files from a directory to a ZIP output stream
		Private Shared Sub AddDirectoryFilesToZip(ByVal sourceDirectory As String, ByVal zipOutputStream As ZipOutputStream)
			' Get list of files in the directory
			Dim files() As String = Directory.GetFiles(sourceDirectory)

			For Each file As String In files
				Dim entry = New ZipEntry(Path.GetFileName(file)) ' Create a new entry for each file
				zipOutputStream.PutNextEntry(entry)

				Using fileStream = System.IO.File.OpenRead(file)
					' Buffer for reading files
					Dim buffer(4095) As Byte
					Dim sourceBytes As Integer

					' Read file and write to ZIP stream
					sourceBytes = fileStream.Read(buffer, 0, buffer.Length)
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: while ((sourceBytes = fileStream.Read(buffer, 0, buffer.Length)) > 0)
					Do While sourceBytes > 0
						zipOutputStream.Write(buffer, 0, sourceBytes)
						sourceBytes = fileStream.Read(buffer, 0, buffer.Length)
					Loop
				End Using
			Next file

			' Handle subdirectories recursively
			Dim subdirectories() As String = Directory.GetDirectories(sourceDirectory)
			For Each subdirectory As String In subdirectories
				AddDirectoryFilesToZip(subdirectory, zipOutputStream)
			Next subdirectory
		End Sub

		' Method to decompress files from a ZIP file
		Private Shared Sub Decompress(ByVal zipFilePath As String, ByVal extractPath As String)
			Using zipInputStream As New ZipInputStream(File.OpenRead(zipFilePath))
				Dim entry As ZipEntry
				' Read entries from the ZIP archive
				entry = zipInputStream.GetNextEntry()
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: while ((entry = zipInputStream.GetNextEntry()) != null)
				Do While entry IsNot Nothing
					Dim entryPath As String = Path.Combine(extractPath, entry.Name)

					' Process files
					If entry.IsFile Then
						Dim directoryName As String = Path.GetDirectoryName(entryPath)
						If Not Directory.Exists(directoryName) Then
							Directory.CreateDirectory(directoryName)
						End If

						Using fileStream = File.Create(entryPath)
							' Buffer for reading entries
							Dim buffer(4095) As Byte
							Dim bytesRead As Integer
							' Read from ZIP stream and write to file
							bytesRead = zipInputStream.Read(buffer, 0, buffer.Length)
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: while ((bytesRead = zipInputStream.Read(buffer, 0, buffer.Length)) > 0)
							Do While bytesRead > 0
								fileStream.Write(buffer, 0, bytesRead)
								bytesRead = zipInputStream.Read(buffer, 0, buffer.Length)
							Loop
						End Using
					ElseIf entry.IsDirectory Then ' Process directories
						Directory.CreateDirectory(entryPath)
					End If
					entry = zipInputStream.GetNextEntry()
				Loop
			End Using
		End Sub
	End Class
End Namespace