DeflateStream 建構函式

參考

定義

命名空間:: System.IO.Compression

組件:: System.IO.Compression.dll

組件:: System.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

初始化 DeflateStream 類別的新執行個體。

多載

DeflateStream(Stream, CompressionLevel)	使用指定的資料流和壓縮層級，初始化 DeflateStream 類別的新執行個體。
DeflateStream(Stream, CompressionMode)	使用指定的資料流和壓縮模式，初始化 DeflateStream 類別的新執行個體。
DeflateStream(Stream, CompressionLevel, Boolean)	使用指定的資料流和壓縮層級，初始化 DeflateStream 類別的新執行個體，並選擇性地保持開啟資料流。
DeflateStream(Stream, CompressionMode, Boolean)	使用指定的資料流和壓縮模式，初始化 DeflateStream 類別的新執行個體，並選擇性地保持開啟資料流。

備註

DeflateStream使用類別壓縮大於 4 GB 的檔案會導致例外狀況。

DeflateStream(Stream, CompressionLevel)

使用指定的資料流和壓縮層級，初始化 DeflateStream 類別的新執行個體。

public:
 DeflateStream(System::IO::Stream ^ stream, System::IO::Compression::CompressionLevel compressionLevel);

public DeflateStream (System.IO.Stream stream, System.IO.Compression.CompressionLevel compressionLevel);

new System.IO.Compression.DeflateStream : System.IO.Stream * System.IO.Compression.CompressionLevel -> System.IO.Compression.DeflateStream

Public Sub New (stream As Stream, compressionLevel As CompressionLevel)

參數

stream: Stream

要壓縮的資料流。

compressionLevel: CompressionLevel

其中一個列舉值，指出當壓縮資料流時是否要強調速度或壓縮的效益。

例外狀況

ArgumentNullException

stream 為 null。

ArgumentException

資料流不支援寫入作業，例如壓縮。 (資料流物件上的 CanWrite屬性是false)。

備註

當您想要指定壓縮效率或速度對類別的 DeflateStream 實例而言更為重要時，請使用這個建構函式。

此建構函式多載會使用壓縮模式 Compress 。若要將壓縮模式設定為另一個值，請使用 DeflateStream(Stream, CompressionMode) 或 DeflateStream(Stream, CompressionMode, Boolean) 多載。

範例

下列範例示範如何在建立 DeflateStream 物件時設定壓縮層級，以及如何讓資料流程保持開啟狀態。

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

public static class FileCompressionLevelExample
{
    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.dfl";

    public static void Main()
    {
        CreateFileToCompress();
        CompressFile();
        PrintResults();
        DeleteFiles();

        /*
         Output:
            The original file 'original.txt' weighs 445 bytes.
            The compressed file 'compressed.dfl' weighs 259 bytes.
         */
    }

    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 DeflateStream(compressedFileStream, CompressionLevel.Fastest);
        originalFileStream.CopyTo(compressor);
    }

    private static void PrintResults()
    {
        long originalSize = new FileInfo(OriginalFileName).Length;
        long compressedSize = new FileInfo(CompressedFileName).Length;
        
        Console.WriteLine($"The original file '{OriginalFileName}' weighs {originalSize} bytes.");
        Console.WriteLine($"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes.");
    }

    private static void DeleteFiles()
    {
        File.Delete(OriginalFileName);
        File.Delete(CompressedFileName);
    }
}

Imports System.IO
Imports System.IO.Compression

Module FileCompressionLevelExample
    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.dfl"

    Sub Main()
        CreateFileToCompress()
        CompressFile()
        PrintResults()
        DeleteFiles()

        'Output:
        '   The original file 'original.txt' weighs 445 bytes.
        '   The compressed file 'compressed.dfl' weighs 259 bytes.
    End Sub

    Private Sub CreateFileToCompress()
        File.WriteAllText(OriginalFileName, Message)
    End Sub

    Private Sub CompressFile()
        Using originalFileStream As FileStream = File.Open(OriginalFileName, FileMode.Open)
            Using compressedFileStream As FileStream = File.Create(CompressedFileName)
                Using compressor = New DeflateStream(compressedFileStream, CompressionLevel.Fastest)
                    originalFileStream.CopyTo(compressor)
                End Using
            End Using
        End Using
    End Sub

    Private Sub PrintResults()
        Dim originalSize As Long = New FileInfo(OriginalFileName).Length
        Dim compressedSize As Long = New FileInfo(CompressedFileName).Length

        Console.WriteLine($"The original file '{OriginalFileName}' weighs {originalSize} bytes.")
        Console.WriteLine($"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes.")
    End Sub

    Private Sub DeleteFiles()
        File.Delete(OriginalFileName)
        File.Delete(CompressedFileName)
    End Sub
End Module

適用於

DeflateStream(Stream, CompressionMode)

使用指定的資料流和壓縮模式，初始化 DeflateStream 類別的新執行個體。

public:
 DeflateStream(System::IO::Stream ^ stream, System::IO::Compression::CompressionMode mode);

public DeflateStream (System.IO.Stream stream, System.IO.Compression.CompressionMode mode);

new System.IO.Compression.DeflateStream : System.IO.Stream * System.IO.Compression.CompressionMode -> System.IO.Compression.DeflateStream

Public Sub New (stream As Stream, mode As CompressionMode)

參數

stream: Stream

要壓縮或解壓縮的資料流。

mode: CompressionMode

其中一個列舉值，表示要壓縮還是解壓縮資料流。

例外狀況

ArgumentNullException

stream 為 null。

ArgumentException

mode 不是有效的 CompressionMode 值。

-或- CompressionMode 是 Compress，而 CanWrite 是 false。

-或- CompressionMode 是 Decompress，而 CanRead 是 false。

備註

根據預設， DeflateStream 擁有基礎資料流程，因此關閉資料流程也會關閉基礎資料流程。請注意，基礎資料流程的狀態可能會影響資料流程的可用性。此外，不會執行明確的檢查，因此建立新實例時不會擲回任何其他例外狀況。

如果類別的實例是以等於 Compress 的參數建立 mode ， DeflateStream 則會立即插入標頭資訊。如果沒有進一步的動作，資料流程會顯示為有效的空白壓縮檔案。

DeflateStream使用類別壓縮大於 4 GB 的檔案會引發例外狀況。

根據預設，當壓縮模式為時，壓縮層級會設定 Optimal 為 Compress 。

範例

下列範例示範如何使用 DeflateStream 類別來壓縮和解壓縮檔案。

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

public static 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.dfl";
    private const string DecompressedFileName = "decompressed.txt";

    public static void 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.dfl' weighs 265 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."
         */
    }

    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 DeflateStream(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 DeflateStream(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($"The original file '{OriginalFileName}' weighs {originalSize} bytes. Contents: \"{File.ReadAllText(OriginalFileName)}\"");
        Console.WriteLine($"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes.");
        Console.WriteLine($"The decompressed file '{DecompressedFileName}' weighs {decompressedSize} bytes. Contents: \"{File.ReadAllText(DecompressedFileName)}\"");
    }

    private static void DeleteFiles()
    {
        File.Delete(OriginalFileName);
        File.Delete(CompressedFileName);
        File.Delete(DecompressedFileName);
    }
}

Imports System.IO
Imports System.IO.Compression

Module 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.dfl"
    Private Const DecompressedFileName As String = "decompressed.txt"

    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.dfl' weighs 265 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 Sub CreateFileToCompress()
        File.WriteAllText(OriginalFileName, Message)
    End Sub

    Private Sub CompressFile()
        Using originalFileStream As FileStream = File.Open(OriginalFileName, FileMode.Open)
            Using compressedFileStream As FileStream = File.Create(CompressedFileName)
                Using compressor = New DeflateStream(compressedFileStream, CompressionMode.Compress)
                    originalFileStream.CopyTo(compressor)
                End Using
            End Using
        End Using
    End Sub

    Private Sub DecompressFile()
        Using compressedFileStream As FileStream = File.Open(CompressedFileName, FileMode.Open)
            Using outputFileStream As FileStream = File.Create(DecompressedFileName)
                Using decompressor = New DeflateStream(compressedFileStream, CompressionMode.Decompress)
                    decompressor.CopyTo(outputFileStream)
                End Using
            End Using
        End Using
    End Sub

    Private 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 Sub DeleteFiles()
        File.Delete(OriginalFileName)
        File.Delete(CompressedFileName)
        File.Delete(DecompressedFileName)
    End Sub
End Module

適用於

DeflateStream(Stream, CompressionLevel, Boolean)

使用指定的資料流和壓縮層級，初始化 DeflateStream 類別的新執行個體，並選擇性地保持開啟資料流。

public:
 DeflateStream(System::IO::Stream ^ stream, System::IO::Compression::CompressionLevel compressionLevel, bool leaveOpen);

public DeflateStream (System.IO.Stream stream, System.IO.Compression.CompressionLevel compressionLevel, bool leaveOpen);

new System.IO.Compression.DeflateStream : System.IO.Stream * System.IO.Compression.CompressionLevel * bool -> System.IO.Compression.DeflateStream

Public Sub New (stream As Stream, compressionLevel As CompressionLevel, leaveOpen As Boolean)

參數

stream: Stream

要壓縮的資料流。

compressionLevel: CompressionLevel

其中一個列舉值，指出當壓縮資料流時是否要強調速度或壓縮的效益。

leaveOpen: Boolean

true 表示在處置 DeflateStream 物件之後，將資料流物件保持開啟；否則為 false。

例外狀況

ArgumentNullException

stream 為 null。

ArgumentException

資料流不支援寫入作業，例如壓縮。 (資料流物件上的 CanWrite屬性是false)。

備註

當您想要指定壓縮效率或速度對類別的 DeflateStream 實例而言更為重要，以及是否要在處置 DeflateStream 物件之後讓資料流程物件保持開啟時，請使用這個建構函式。

範例

下列範例示範如何在建立 DeflateStream 物件時設定壓縮層級，以及如何讓資料流程保持開啟狀態。

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

public static class FileCompressionLevelExample
{
    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.dfl";

    public static void Main()
    {
        CreateFileToCompress();
        CompressFile();
        PrintResults();
        DeleteFiles();

        /*
         Output:
            The original file 'original.txt' weighs 445 bytes.
            The compressed file 'compressed.dfl' weighs 259 bytes.
         */
    }

    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 DeflateStream(compressedFileStream, CompressionLevel.Fastest);
        originalFileStream.CopyTo(compressor);
    }

    private static void PrintResults()
    {
        long originalSize = new FileInfo(OriginalFileName).Length;
        long compressedSize = new FileInfo(CompressedFileName).Length;
        
        Console.WriteLine($"The original file '{OriginalFileName}' weighs {originalSize} bytes.");
        Console.WriteLine($"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes.");
    }

    private static void DeleteFiles()
    {
        File.Delete(OriginalFileName);
        File.Delete(CompressedFileName);
    }
}

Imports System.IO
Imports System.IO.Compression

Module FileCompressionLevelExample
    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.dfl"

    Sub Main()
        CreateFileToCompress()
        CompressFile()
        PrintResults()
        DeleteFiles()

        'Output:
        '   The original file 'original.txt' weighs 445 bytes.
        '   The compressed file 'compressed.dfl' weighs 259 bytes.
    End Sub

    Private Sub CreateFileToCompress()
        File.WriteAllText(OriginalFileName, Message)
    End Sub

    Private Sub CompressFile()
        Using originalFileStream As FileStream = File.Open(OriginalFileName, FileMode.Open)
            Using compressedFileStream As FileStream = File.Create(CompressedFileName)
                Using compressor = New DeflateStream(compressedFileStream, CompressionLevel.Fastest)
                    originalFileStream.CopyTo(compressor)
                End Using
            End Using
        End Using
    End Sub

    Private Sub PrintResults()
        Dim originalSize As Long = New FileInfo(OriginalFileName).Length
        Dim compressedSize As Long = New FileInfo(CompressedFileName).Length

        Console.WriteLine($"The original file '{OriginalFileName}' weighs {originalSize} bytes.")
        Console.WriteLine($"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes.")
    End Sub

    Private Sub DeleteFiles()
        File.Delete(OriginalFileName)
        File.Delete(CompressedFileName)
    End Sub
End Module

適用於

DeflateStream(Stream, CompressionMode, Boolean)

使用指定的資料流和壓縮模式，初始化 DeflateStream 類別的新執行個體，並選擇性地保持開啟資料流。

public:
 DeflateStream(System::IO::Stream ^ stream, System::IO::Compression::CompressionMode mode, bool leaveOpen);

public DeflateStream (System.IO.Stream stream, System.IO.Compression.CompressionMode mode, bool leaveOpen);

new System.IO.Compression.DeflateStream : System.IO.Stream * System.IO.Compression.CompressionMode * bool -> System.IO.Compression.DeflateStream

Public Sub New (stream As Stream, mode As CompressionMode, leaveOpen As Boolean)

參數

stream: Stream

要壓縮或解壓縮的資料流。

mode: CompressionMode

其中一個列舉值，表示要壓縮還是解壓縮資料流。

leaveOpen: Boolean

true 表示在處置 DeflateStream 物件之後，將資料流保持開啟，否則為 false。

例外狀況

ArgumentNullException

stream 為 null。

ArgumentException

mode 不是有效的 CompressionMode 值。

-或- CompressionMode 是 Compress，而 CanWrite 是 false。

-或- CompressionMode 是 Decompress，而 CanRead 是 false。

備註

DeflateStream使用類別壓縮大於 4 GB 的檔案會引發例外狀況。

根據預設，當壓縮模式為時，壓縮層級會設定 Optimal 為 Compress 。

範例

下列範例示範如何使用 DeflateStream 類別來壓縮和解壓縮檔案。

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

public static 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.dfl";
    private const string DecompressedFileName = "decompressed.txt";

    public static void 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.dfl' weighs 265 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."
         */
    }

    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 DeflateStream(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 DeflateStream(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($"The original file '{OriginalFileName}' weighs {originalSize} bytes. Contents: \"{File.ReadAllText(OriginalFileName)}\"");
        Console.WriteLine($"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes.");
        Console.WriteLine($"The decompressed file '{DecompressedFileName}' weighs {decompressedSize} bytes. Contents: \"{File.ReadAllText(DecompressedFileName)}\"");
    }

    private static void DeleteFiles()
    {
        File.Delete(OriginalFileName);
        File.Delete(CompressedFileName);
        File.Delete(DecompressedFileName);
    }
}

Imports System.IO
Imports System.IO.Compression

Module 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.dfl"
    Private Const DecompressedFileName As String = "decompressed.txt"

    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.dfl' weighs 265 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 Sub CreateFileToCompress()
        File.WriteAllText(OriginalFileName, Message)
    End Sub

    Private Sub CompressFile()
        Using originalFileStream As FileStream = File.Open(OriginalFileName, FileMode.Open)
            Using compressedFileStream As FileStream = File.Create(CompressedFileName)
                Using compressor = New DeflateStream(compressedFileStream, CompressionMode.Compress)
                    originalFileStream.CopyTo(compressor)
                End Using
            End Using
        End Using
    End Sub

    Private Sub DecompressFile()
        Using compressedFileStream As FileStream = File.Open(CompressedFileName, FileMode.Open)
            Using outputFileStream As FileStream = File.Create(DecompressedFileName)
                Using decompressor = New DeflateStream(compressedFileStream, CompressionMode.Decompress)
                    decompressor.CopyTo(outputFileStream)
                End Using
            End Using
        End Using
    End Sub

    Private 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 Sub DeleteFiles()
        File.Delete(OriginalFileName)
        File.Delete(CompressedFileName)
        File.Delete(DecompressedFileName)
    End Sub
End Module

適用於

DeflateStream 建構函式

定義

多載

備註

DeflateStream(Stream, CompressionLevel)

參數

例外狀況

備註

範例

適用於

DeflateStream(Stream, CompressionMode)

參數

例外狀況

備註

範例

適用於

DeflateStream(Stream, CompressionLevel, Boolean)

參數

例外狀況

備註

範例

適用於

DeflateStream(Stream, CompressionMode, Boolean)

參數

例外狀況

備註

範例

適用於

其他資源