ZipFileExtensions Klass

Definition

public ref class ZipFileExtensions abstract sealed

public static class ZipFileExtensions

type ZipFileExtensions = class

Public Module ZipFileExtensions

Arv

Object

ZipFileExtensions

Kommentarer

Klassen ZipFileExtensions innehåller endast statiska metoder som utökar klasserna ZipArchive och ZipArchiveEntry . Du skapar inte en instans av ZipFileExtensions klassen. I stället använder du dessa metoder från instanser av ZipArchive eller ZipArchiveEntry.

Om du vill använda tilläggsmetoderna måste du referera till System.IO.Compression.FileSystem sammansättningen i projektet. Sammansättningen System.IO.Compression.FileSystem är inte tillgänglig i Windows 8.x Store-appar. Därför är klasserna ZipFileExtensions och ZipFile (som båda finns i sammansättningen System.IO.Compression.FileSystem) inte tillgängliga i Windows 8.x Store-appar. I Windows 8.x Store-appar arbetar du med komprimerade filer med hjälp av metoderna i ZipArchive, ZipArchiveEntry, DeflateStream och GZipStream.

Klassen ZipFileExtensions innehåller fyra metoder som utökar ZipArchive:

• CreateEntryFromFile(ZipArchive, String, String)

• CreateEntryFromFile(ZipArchive, String, String, CompressionLevel)

• ExtractToDirectory(ZipArchive, String)

• ExtractToDirectory(ZipArchive, String, Boolean)

Klassen ZipFileExtensions innehåller två metoder som utökar ZipArchiveEntry:

• ExtractToFile(ZipArchiveEntry, String)

• ExtractToFile(ZipArchiveEntry, String, Boolean)

Exempel

I följande exempel visas hur du skapar en ny post i ett zip-arkiv från en befintlig fil och extraherar innehållet i arkivet till en katalog.

using System;
using System.IO;
using System.IO.Compression;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string zipPath = @"c:\users\exampleuser\start.zip";
            string extractPath = @"c:\users\exampleuser\extract";
            string newFile = @"c:\users\exampleuser\NewFile.txt";

            using (ZipArchive archive = ZipFile.Open(zipPath, ZipArchiveMode.Update))
            {
                archive.CreateEntryFromFile(newFile, "NewEntry.txt");
                archive.ExtractToDirectory(extractPath);
            }
        }
    }
}

Imports System.IO
Imports System.IO.Compression

Module Module1

    Sub Main()
        Dim zipPath As String = "c:\users\exampleuser\end.zip"
        Dim extractPath As String = "c:\users\exampleuser\extract"
        Dim newFile As String = "c:\users\exampleuser\NewFile.txt"

        Using archive As ZipArchive = ZipFile.Open(zipPath, ZipArchiveMode.Update)
            archive.CreateEntryFromFile(newFile, "NewEntry.txt", CompressionLevel.Fastest)
            archive.ExtractToDirectory(extractPath)
        End Using
    End Sub

End Module

I följande exempel visas hur du itererar genom innehållet i ett zip-arkiv och extraherar filer som har ett .txt-tillägg.

using System;
using System.IO;
using System.IO.Compression;

class Program
{
    static void Main(string[] args)
    {
        string zipPath = @".\result.zip";

        Console.WriteLine("Provide path where to extract the zip file:");
        string extractPath = Console.ReadLine();

        // Normalizes the path.
        extractPath = Path.GetFullPath(extractPath);

        // Ensures that the last character on the extraction path
        // is the directory separator char.
        // Without this, a malicious zip file could try to traverse outside of the expected
        // extraction path.
        if (!extractPath.EndsWith(Path.DirectorySeparatorChar.ToString(), StringComparison.Ordinal))
            extractPath += Path.DirectorySeparatorChar;

        using (ZipArchive archive = ZipFile.OpenRead(zipPath))
        {
            foreach (ZipArchiveEntry entry in archive.Entries)
            {
                if (entry.FullName.EndsWith(".txt", StringComparison.OrdinalIgnoreCase))
                {
                    // Gets the full path to ensure that relative segments are removed.
                    string destinationPath = Path.GetFullPath(Path.Combine(extractPath, entry.FullName));

                    // Ordinal match is safest, case-sensitive volumes can be mounted within volumes that
                    // are case-insensitive.
                    if (destinationPath.StartsWith(extractPath, StringComparison.Ordinal))
                        entry.ExtractToFile(destinationPath);
                }
            }
        }
    }
}

Imports System.IO
Imports System.IO.Compression

Module Module1

    Sub Main()
        Dim zipPath As String = ".\result.zip"

        Console.WriteLine("Provide path where to extract the zip file:")
        Dim extractPath As String = Console.ReadLine()

        ' Normalizes the path.
        extractPath = Path.GetFullPath(extractPath)

        ' Ensures that the last character on the extraction path
        ' is the directory separator char. 
        ' Without this, a malicious zip file could try to traverse outside of the expected
        ' extraction path.
        If Not extractPath.EndsWith(Path.DirectorySeparatorChar.ToString(), StringComparison.Ordinal) Then
            extractPath += Path.DirectorySeparatorChar
        End If

        Using archive As ZipArchive = ZipFile.OpenRead(zipPath)
            For Each entry As ZipArchiveEntry In archive.Entries
                If entry.FullName.EndsWith(".txt", StringComparison.OrdinalIgnoreCase) Then

                    ' Gets the full path to ensure that relative segments are removed.
                    Dim destinationPath As String = Path.GetFullPath(Path.Combine(extractPath, entry.FullName))
                    
                    ' Ordinal match is safest, case-sensitive volumes can be mounted within volumes that
                    ' are case-insensitive.
                    If destinationPath.StartsWith(extractPath, StringComparison.Ordinal) Then 
                        entry.ExtractToFile(destinationPath)
                    End If

                End If
            Next
        End Using
    End Sub

End Module