CompressionMode Enumeração
Importante
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Especifica se os dados devem ser compactados ou descompactados do fluxo subjacente.
public enum class CompressionMode
public enum CompressionMode
type CompressionMode =
Public Enum CompressionMode
- Herança
Compress | 1 | Compacta os dados para o fluxo subjacente. |
Decompress | 0 | Descompacta os dados do fluxo subjacente. |
O exemplo de código a seguir usa a CompressionMode enumeração com a GZipStream classe para compactar e descompactar um arquivo.
using System;
using System.IO;
using System.IO.Compression;
public class FileCompressionModeExample
{
private const string Message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
private const string OriginalFileName = "original.txt";
private const string CompressedFileName = "compressed.gz";
private const string DecompressedFileName = "decompressed.txt";
public static void Run()
{
CreateFileToCompress();
CompressFile();
DecompressFile();
PrintResults();
DeleteFiles();
/*
Output:
The original file 'original.txt' is 445 bytes. Contents: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
The compressed file 'compressed.gz' is 283 bytes.
The decompressed file 'decompressed.txt' is 445 bytes. Contents: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
*/
}
private static void CreateFileToCompress() => File.WriteAllText(OriginalFileName, Message);
private static void CompressFile()
{
using FileStream originalFileStream = File.Open(OriginalFileName, FileMode.Open);
using FileStream compressedFileStream = File.Create(CompressedFileName);
using var compressor = new GZipStream(compressedFileStream, CompressionMode.Compress);
originalFileStream.CopyTo(compressor);
}
private static void DecompressFile()
{
using FileStream compressedFileStream = File.Open(CompressedFileName, FileMode.Open);
using FileStream outputFileStream = File.Create(DecompressedFileName);
using var decompressor = new GZipStream(compressedFileStream, CompressionMode.Decompress);
decompressor.CopyTo(outputFileStream);
}
private static void PrintResults()
{
long originalSize = new FileInfo(OriginalFileName).Length;
long compressedSize = new FileInfo(CompressedFileName).Length;
long decompressedSize = new FileInfo(DecompressedFileName).Length;
Console.WriteLine($"The original file '{OriginalFileName}' is {originalSize} bytes. Contents: \"{File.ReadAllText(OriginalFileName)}\"");
Console.WriteLine($"The compressed file '{CompressedFileName}' is {compressedSize} bytes.");
Console.WriteLine($"The decompressed file '{DecompressedFileName}' is {decompressedSize} bytes. Contents: \"{File.ReadAllText(DecompressedFileName)}\"");
}
private static void DeleteFiles()
{
File.Delete(OriginalFileName);
File.Delete(CompressedFileName);
File.Delete(DecompressedFileName);
}
}
Imports System
Imports System.IO
Imports System.IO.Compression
Public Class FileCompressionModeExample
Private Const Message As String = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
Private Const OriginalFileName As String = "original.txt"
Private Const CompressedFileName As String = "compressed.gz"
Private Const DecompressedFileName As String = "decompressed.txt"
Public Shared Sub Main()
CreateFileToCompress()
CompressFile()
DecompressFile()
PrintResults()
DeleteFiles()
' Output:
' The original file 'original.txt' weighs 445 bytes. Contents: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
' The compressed file 'compressed.gz' weighs 283 bytes.
' The decompressed file 'decompressed.txt' weighs 445 bytes. Contents: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
End Sub
Private Shared Sub CreateFileToCompress()
File.WriteAllText(OriginalFileName, Message)
End Sub
Private Shared Sub CompressFile()
Using originalFileStream As FileStream = File.Open(OriginalFileName, FileMode.Open)
Using compressedFileStream As FileStream = File.Create(CompressedFileName)
Using compressor = New GZipStream(compressedFileStream, CompressionMode.Compress)
originalFileStream.CopyTo(compressor)
End Using
End Using
End Using
End Sub
Private Shared Sub DecompressFile()
Using compressedFileStream As FileStream = File.Open(CompressedFileName, FileMode.Open)
Using outputFileStream As FileStream = File.Create(DecompressedFileName)
Using decompressor = New GZipStream(compressedFileStream, CompressionMode.Decompress)
decompressor.CopyTo(outputFileStream)
End Using
End Using
End Using
End Sub
Private Shared Sub PrintResults()
Dim originalSize As Long = New FileInfo(OriginalFileName).Length
Dim compressedSize As Long = New FileInfo(CompressedFileName).Length
Dim decompressedSize As Long = New FileInfo(DecompressedFileName).Length
Console.WriteLine($"The original file '{OriginalFileName}' weighs {originalSize} bytes. Contents: ""{File.ReadAllText(OriginalFileName)}""")
Console.WriteLine($"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes.")
Console.WriteLine($"The decompressed file '{DecompressedFileName}' weighs {decompressedSize} bytes. Contents: ""{File.ReadAllText(DecompressedFileName)}""")
End Sub
Private Shared Sub DeleteFiles()
File.Delete(OriginalFileName)
File.Delete(CompressedFileName)
File.Delete(DecompressedFileName)
End Sub
End Class
Essa enumeração é usada com as GZipStream classes e DeflateStream .
Produto | Versões |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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