ZipFileExtensions.ExtractToFile Método

public:
[System::Runtime::CompilerServices::Extension]
 static void ExtractToFile(System::IO::Compression::ZipArchiveEntry ^ source, System::String ^ destinationFileName);

public static void ExtractToFile(this System.IO.Compression.ZipArchiveEntry source, string destinationFileName);

static member ExtractToFile : System.IO.Compression.ZipArchiveEntry * string -> unit

<Extension()>
Public Sub ExtractToFile (source As ZipArchiveEntry, destinationFileName As String)

Parâmetros

Exceções

Exemplos

O exemplo seguinte mostra como iterar pelo conteúdo de um ficheiro zip e extrair ficheiros que têm uma extensão .txt.

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

Observações

Se o ficheiro de destino já existir, este método não o sobreescreve; Faz uma IOException exceção. Para sobrescrever um ficheiro existente, use o ExtractToFile(ZipArchiveEntry, String, Boolean) método overload em vez disso.

O último tempo de escrita do ficheiro é definido para a última vez que a entrada no arquivo zip foi alterada; este valor é armazenado na LastWriteTime propriedade.

Não pode usar este método para extrair um diretório; Usa o ExtractToDirectory método em vez disso.

public:
[System::Runtime::CompilerServices::Extension]
 static void ExtractToFile(System::IO::Compression::ZipArchiveEntry ^ source, System::String ^ destinationFileName, bool overwrite);

public static void ExtractToFile(this System.IO.Compression.ZipArchiveEntry source, string destinationFileName, bool overwrite);

static member ExtractToFile : System.IO.Compression.ZipArchiveEntry * string * bool -> unit

<Extension()>
Public Sub ExtractToFile (source As ZipArchiveEntry, destinationFileName As String, overwrite As Boolean)

Parâmetros

Exceções

Exemplos

O exemplo seguinte mostra como iterar pelo conteúdo de um ficheiro zip e extrair ficheiros que têm uma extensão .txt. Sobrescreve um ficheiro existente com o mesmo nome na pasta de destino. Para compilar este exemplo de código, deve referenciar os System.IO.Compression assemblies e System.IO.Compression.FileSystem no seu projeto.

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string zipPath = @"c:\example\start.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))
                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, true);
                    }
                }
            }
        }
    }
}

Imports System.IO
Imports System.IO.Compression

Module Module1

    Sub Main()
        Dim zipPath As String = "c:\example\start.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) 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, true)
                    End If

                End If
            Next
        End Using
    End Sub

End Module

Observações

O último tempo de escrita do ficheiro é definido para a última vez que a entrada no arquivo zip foi alterada; este valor é armazenado na LastWriteTime propriedade.

Não pode usar este método para extrair um diretório; Usa o ExtractToDirectory método em vez disso.