ZipFileExtensions 类
定义
重要
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为和ZipArchive类提供扩展方法ZipArchiveEntry。
public ref class ZipFileExtensions abstract sealedpublic static class ZipFileExtensionstype ZipFileExtensions = classPublic Module ZipFileExtensions- 继承
-
ZipFileExtensions
注解
该 ZipFileExtensions 类仅包含扩展 ZipArchive 和 ZipArchiveEntry 类的静态方法。 您不创建类的ZipFileExtensions实例;而是从或ZipArchive的ZipArchiveEntry实例使用这些方法。
若要使用扩展方法，必须在项目中引用 System.IO.Compression.FileSystem 程序集。 Windows 8.x 应用商店应用中不提供 System.IO.Compression.FileSystem 程序集。 因此，ZipFileExtensions 和 ZipFile 类（它们都位于 System.IO.Compression.FileSystem 程序集中）在 Windows 8.x 应用商店应用中不可用。 在 Windows 8.x 应用商店应用中，可以使用 ZipArchive、ZipArchiveEntry、DeflateStream 和 GZipStream 中的方法处理压缩文件。
该 ZipFileExtensions 类包含四个扩展 ZipArchive方法：
该 ZipFileExtensions 类包含两个扩展 ZipArchiveEntry方法：
示例
以下示例演示如何从现有文件在 zip 存档中创建一个新条目，以及如何将存档的内容提取到目录中。
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
以下示例演示如何循环访问 zip 存档的内容并提取扩展名为 .txt 的文件。
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
