ZipFileExtensions Class

Definition

Fornisce metodi di estensione per le classi ZipArchive e ZipArchiveEntry.Provides extension methods for the ZipArchive and ZipArchiveEntry classes.

public ref class ZipFileExtensions abstract sealed
public static class ZipFileExtensions
type ZipFileExtensions = class
Public Module ZipFileExtensions
Inheritance
ZipFileExtensions

Examples

Nell'esempio seguente viene illustrato come creare una nuova voce in un archivio zip da un file esistente ed estrarre il contenuto dell'archivio in una directory.The following example shows how to create a new entry in a zip archive from an existing file, and extract the contents of the archive to a directory.

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

Nell'esempio seguente viene illustrato come scorrere il contenuto di un archivio zip ed estrarre i file con estensione txt.The following example shows how to iterate through the contents of a zip archive and extract files that have a .txt extension.

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

Remarks

La classe ZipFileExtensions contiene solo metodi statici che estendono le classi ZipArchive e ZipArchiveEntry.The ZipFileExtensions class contains only static methods that extend the ZipArchive and ZipArchiveEntry classes. Non è possibile creare un'istanza della classe ZipFileExtensions. usare invece questi metodi da istanze di ZipArchive o ZipArchiveEntry.You do not create an instance of the ZipFileExtensions class; instead, you use these methods from instances of ZipArchive or ZipArchiveEntry.

Per usare i metodi di estensione, è necessario fare riferimento all'assembly System.IO.Compression.FileSystem nel progetto.To use the extension methods, you must reference the System.IO.Compression.FileSystem assembly in your project. L'assembly System.IO.Compression.FileSystem non è disponibile nelle app Windows 8.x StoreWindows 8.x Store.The System.IO.Compression.FileSystem assembly is not available in Windows 8.x StoreWindows 8.x Store apps. Pertanto, le classi ZipFileExtensions e ZipFile (entrambe incluse nell'assembly System.IO.Compression.FileSystem) non sono disponibili nelle app Windows 8.x StoreWindows 8.x Store.Therefore, the ZipFileExtensions and ZipFile classes (both of which are in the System.IO.Compression.FileSystem assembly) are not available in Windows 8.x StoreWindows 8.x Store apps. Nelle app Windows 8.x StoreWindows 8.x Store si usano i file compressi usando i metodi in ZipArchive, ZipArchiveEntry, DeflateStreame GZipStream.In Windows 8.x StoreWindows 8.x Store apps, you work with compressed files by using the methods in ZipArchive, ZipArchiveEntry, DeflateStream, and GZipStream.

La classe ZipFileExtensions contiene quattro metodi che estendono ZipArchive:The ZipFileExtensions class contains four methods that extend ZipArchive:

La classe ZipFileExtensions contiene due metodi che estendono ZipArchiveEntry:The ZipFileExtensions class contains two methods that extend ZipArchiveEntry:

Methods

CreateEntryFromFile(ZipArchive, String, String)

Archivia un file comprimendolo e aggiungendolo all'archivio ZIP.Archives a file by compressing it and adding it to the zip archive.

CreateEntryFromFile(ZipArchive, String, String, CompressionLevel)

Archivia un file comprimendolo con il livello di compressione specificato e aggiungendolo all'archivio ZIP.Archives a file by compressing it using the specified compression level and adding it to the zip archive.

ExtractToDirectory(ZipArchive, String)

Estrae tutti i file nell'archivio ZIP in una directory del file system.Extracts all the files in the zip archive to a directory on the file system.

ExtractToDirectory(ZipArchive, String, Boolean)

Estrae tutti i file nell'archivio in una directory nel file system.Extracts all of the files in the archive to a directory on the file system.

ExtractToFile(ZipArchiveEntry, String)

Estrae una voce nell'archivio ZIP in un file.Extracts an entry in the zip archive to a file.

ExtractToFile(ZipArchiveEntry, String, Boolean)

Estrae una voce nell'archivio ZIP in un file e facoltativamente sovrascrivere un file esistente con lo stesso nome.Extracts an entry in the zip archive to a file, and optionally overwrites an existing file that has the same name.

Applies to