DeflateStream 建構函式

定義

命名空間:: System.IO.Compression

組件:: System.dll, System.IO.Compression.dll

組件:: netstandard.dll, System.IO.Compression.dll

組件:: System.IO.Compression.dll

組件:: netstandard.dll

組件:: System.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

名稱	Description
DeflateStream(Stream, CompressionLevel)	透過使用指定的串流與壓縮等級初始化該類別的新 DeflateStream 實例。
DeflateStream(Stream, CompressionMode)	透過指定的串流與壓縮模式初始化該類別的新 DeflateStream 實例。
DeflateStream(Stream, CompressionLevel, Boolean)	透過指定的串流與壓縮等級初始化該類別的新實例 DeflateStream ，並可選擇性地保持串流開啟。
DeflateStream(Stream, CompressionMode, Boolean)	透過指定的串流與壓縮模式初始化類別的新實例 DeflateStream ，並可選擇性地保持串流開啟。
DeflateStream(Stream, ZLibCompressionOptions, Boolean)	透過指定的串流初始化類別的新實例 DeflateStream ，壓縮選項，並可選擇性地保持串流開啟。

DeflateStream(Stream, CompressionLevel)

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

透過使用指定的串流與壓縮等級初始化該類別的新 DeflateStream 實例。

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

壓縮資料被寫入的串流。

compressionLevel: CompressionLevel

其中一個列舉值表示在將資料壓縮到串流時，應該強調速度還是壓縮效率。

例外狀況

ArgumentNullException

stream 是 null。

ArgumentException

串流不支援寫入操作，例如壓縮。（ CanWrite 串流物件上的屬性為 false。）

備註

當你想指定對類別的某個實例 DeflateStream ，壓縮效率還是速度哪個更重要時，你會使用這個建構子。

此建構子過載使用壓縮模式 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) overload。

範例

以下範例展示了如何在建立 DeflateStream 物件時設定壓縮等級，以及如何保持串流開啟。

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 Run()
    {
        CreateFileToCompress();
        CompressFile();
        PrintResults();
        DeleteFiles();

        /*
         Output:
            The original file 'original.txt' is 445 bytes.
            The compressed file 'compressed.dfl' is 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($"The original file '{OriginalFileName}' is {originalSize} bytes.");
        Console.WriteLine($"The compressed file '{CompressedFileName}' is {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)

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

透過指定的串流與壓縮模式初始化該類別的新 DeflateStream 實例。

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

讀取壓縮資料的串流，或從哪個資料解壓。

mode: CompressionMode

其中一個列舉值，指示是將資料壓縮到串流，還是從串流解壓。

例外狀況

ArgumentNullException

stream 是 null。

ArgumentException

mode 不是一個有效的 CompressionMode 值。

-或-

CompressionMode是Compress且 CanWrite 。false

-或-

CompressionMode是Decompress且 CanRead 。false

備註

預設情況下， DeflateStream 擁有底層串流，因此關閉串流也會關閉底層串流。請注意，底層串流的狀態會影響串流的可用性。此外，不會執行明確檢查，因此在建立新實例時不會拋出額外的例外。

若建立類別的實DeflateStream例mode參數Compress為，標頭資訊會立即插入。若沒有進一步動作，串流會顯示為有效、空且已壓縮的檔案。

預設情況下，壓縮等級設定為 Optimal 壓縮模式為 Compress。

範例

以下範例展示了如何使用該 DeflateStream 類別來壓縮和解壓檔案。

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 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.dfl' is 265 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 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($"The original file '{OriginalFileName}' is {originalSize} bytes. Contents: \"{File.ReadAllText(OriginalFileName)}\"");
        Console.WriteLine($"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.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)

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

透過指定的串流與壓縮等級初始化該類別的新實例 DeflateStream ，並可選擇性地保持串流開啟。

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

壓縮資料被寫入的串流。

compressionLevel: CompressionLevel

其中一個列舉值表示在將資料壓縮到串流時，應該強調速度還是壓縮效率。

leaveOpen: Boolean

true在處理DeflateStream完物件後，保持串流物件開啟;否則，。 false

例外狀況

ArgumentNullException

stream 是 null。

ArgumentException

串流不支援寫入操作，例如壓縮。（ CanWrite 串流物件上的屬性為 false。）

備註

當你想指定壓縮效率還是速度對類別實例 DeflateStream 更重要，以及丟棄 DeflateStream 物件後是否應該保持串流物件開啟時，你會使用這個建構器。

範例

以下範例展示了如何在建立 DeflateStream 物件時設定壓縮等級，以及如何保持串流開啟。

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 Run()
    {
        CreateFileToCompress();
        CompressFile();
        PrintResults();
        DeleteFiles();

        /*
         Output:
            The original file 'original.txt' is 445 bytes.
            The compressed file 'compressed.dfl' is 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($"The original file '{OriginalFileName}' is {originalSize} bytes.");
        Console.WriteLine($"The compressed file '{CompressedFileName}' is {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)

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

透過指定的串流與壓縮模式初始化類別的新實例 DeflateStream ，並可選擇性地保持串流開啟。

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

讀取壓縮資料的串流，或從哪個資料解壓。

mode: CompressionMode

其中一個列舉值，指示是將資料壓縮到串流，還是從串流解壓。

leaveOpen: Boolean

true在處理DeflateStream完物體後，保持溪流開啟;否則，。 false

例外狀況

ArgumentNullException

stream 是 null。

ArgumentException

mode 不是一個有效的 CompressionMode 值。

-或-

CompressionMode是Compress且 CanWrite 。false

-或-

CompressionMode是Decompress且 CanRead 。false

備註

若建立類別的實DeflateStream例mode參數Compress為，標頭資訊會立即插入。若沒有進一步動作，串流會顯示為有效、空且已壓縮的檔案。

預設情況下，壓縮等級設定為 Optimal 壓縮模式為 Compress。

範例

以下範例展示了如何使用該 DeflateStream 類別來壓縮和解壓檔案。

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 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.dfl' is 265 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 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($"The original file '{OriginalFileName}' is {originalSize} bytes. Contents: \"{File.ReadAllText(OriginalFileName)}\"");
        Console.WriteLine($"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.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, ZLibCompressionOptions, Boolean)

來源:: DeflateStream.cs

來源:: DeflateStream.cs

來源:: DeflateStream.cs

透過指定的串流初始化類別的新實例 DeflateStream ，壓縮選項，並可選擇性地保持串流開啟。

public DeflateStream(System.IO.Stream stream, System.IO.Compression.ZLibCompressionOptions compressionOptions, bool leaveOpen = false);

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

Public Sub New (stream As Stream, compressionOptions As ZLibCompressionOptions, Optional leaveOpen As Boolean = false)

參數

stream: Stream

壓縮資料被寫入的串流。

compressionOptions: ZLibCompressionOptions

壓縮流微調選項。

leaveOpen: Boolean

true 處理完物件後保持 DeflateStream 串流物件開啟;否則， false

例外狀況

ArgumentNullException

stream 或 compressionOptions 為 null。

適用於

意見反應

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