GZipStream 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 GZipStream 類別的新執行個體。

多載

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

GZipStream(Stream, CompressionLevel)

來源:: GZipStream.cs

來源:: GZipStream.cs

來源:: GZipStream.cs

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

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

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

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

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

參數

stream: Stream

寫入壓縮數據的數據流。

compressionLevel: CompressionLevel

其中一個列舉值，指出將數據壓縮至數據流時，是否要強調速度或壓縮效率。

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 GZipStream 實例而言更為重要時，請使用這個建構函式。

這個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 GZipStream(Stream, CompressionMode) 或 GZipStream(Stream, CompressionMode, Boolean) 多載。

適用於

GZipStream(Stream, CompressionMode)

來源:: GZipStream.cs

來源:: GZipStream.cs

來源:: GZipStream.cs

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

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

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

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

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

參數

stream: Stream

寫入壓縮數據的數據流，或從中讀取要解壓縮的數據。

mode: CompressionMode

其中一個列舉值，指出要將數據壓縮至數據流，還是從數據流解壓縮數據。

例外狀況

ArgumentNullException

stream 為 null。

ArgumentException

mode 不是有效的 CompressionMode 列舉值。

-或-

CompressionMode 是 Compress，而 CanWrite 是 false。

-或-

CompressionMode 是 Decompress，而 CanRead 是 false。

範例

下列範例示範如何在建立 GZipStream 物件時設定壓縮模式。

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);
    }
}

open System.IO
open System.IO.Compression

let 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."

let OriginalFileName = "original.txt"
let CompressedFileName = "compressed.gz"
let DecompressedFileName = "decompressed.txt"

let createFileToCompress () =
    File.WriteAllText(OriginalFileName, message)

let compressFile () =
    use originalFileStream = File.Open(OriginalFileName, FileMode.Open)
    use compressedFileStream = File.Create CompressedFileName
    use compressor = new GZipStream(compressedFileStream, CompressionMode.Compress)
    originalFileStream.CopyTo compressor

let decompressFile () =
    use compressedFileStream = File.Open(CompressedFileName, FileMode.Open)
    use outputFileStream = File.Create DecompressedFileName
    use decompressor = new GZipStream(compressedFileStream, CompressionMode.Decompress)
    decompressor.CopyTo outputFileStream

let printResults () =
    let originalSize = FileInfo(OriginalFileName).Length
    let compressedSize = FileInfo(CompressedFileName).Length
    let decompressedSize = FileInfo(DecompressedFileName).Length

    printfn
        $"The original file '{OriginalFileName}' weighs {originalSize} bytes. Contents: \"{File.ReadAllText OriginalFileName}\""

    printfn $"The compressed file '{CompressedFileName}' weighs {compressedSize} bytes."

    printfn
        $"The decompressed file '{DecompressedFileName}' weighs {decompressedSize} bytes. Contents: \"{File.ReadAllText DecompressedFileName}\""

let deleteFiles () =
    File.Delete OriginalFileName
    File.Delete CompressedFileName
    File.Delete DecompressedFileName

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."

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

備註

根據預設， GZipStream 擁有基礎數據流，因此關閉 stream 參數也會關閉基礎數據流。請注意，基礎數據流的狀態可能會影響數據流的可用性。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GZipStream實例是以等於 Compress 的參數建立mode，而且不會再執行任何動作，則數據流會顯示為有效的空白壓縮檔案。

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

適用於

GZipStream(Stream, CompressionLevel, Boolean)

來源:: GZipStream.cs

來源:: GZipStream.cs

來源:: GZipStream.cs

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

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

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

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

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

參數

stream: Stream

寫入壓縮數據的數據流。

compressionLevel: CompressionLevel

其中一個列舉值，指出將數據壓縮至數據流時，是否要強調速度或壓縮效率。

leaveOpen: Boolean

true 表示在處置 GZipStream 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)。

範例

下列範例示範如何在建立 GZipStream 物件時設定壓縮層級，以及如何讓數據流保持開啟狀態。

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

public static class MemoryWriteReadExample
{
    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 static readonly byte[] s_messageBytes = Encoding.ASCII.GetBytes(Message);

    public static void Run()
    {
        Console.WriteLine($"The original string length is {s_messageBytes.Length} bytes.");
        using var stream = new MemoryStream();
        CompressBytesToStream(stream);
        Console.WriteLine($"The compressed stream length is {stream.Length} bytes.");
        int decompressedLength = DecompressStreamToBytes(stream);
        Console.WriteLine($"The decompressed string length is {decompressedLength} bytes, same as the original length.");
        /*
         Output:
            The original string length is 445 bytes.
            The compressed stream length is 282 bytes.
            The decompressed string length is 445 bytes, same as the original length.
        */
    }

    private static void CompressBytesToStream(Stream stream)
    {
        using var compressor = new GZipStream(stream, CompressionLevel.SmallestSize, leaveOpen: true);
        compressor.Write(s_messageBytes, 0, s_messageBytes.Length);
    }

    private static int DecompressStreamToBytes(Stream stream)
    {
        stream.Position = 0;
        int bufferSize = 512;
        byte[] buffer = new byte[bufferSize];
        using var gzipStream = new GZipStream(stream, CompressionMode.Decompress);

        int totalRead = 0;
        while (totalRead < buffer.Length)
        {
            int bytesRead = gzipStream.Read(buffer.AsSpan(totalRead));
            if (bytesRead == 0) break;
            totalRead += bytesRead;
        }

        return totalRead;
    }
}

open System.IO
open System.IO.Compression
open System.Text

let 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."

let s_messageBytes = Encoding.ASCII.GetBytes message

let compressBytesToStream stream =
    use compressor =
        new GZipStream(stream, CompressionLevel.SmallestSize, leaveOpen = true)

    compressor.Write(s_messageBytes, 0, s_messageBytes.Length)

let decompressStreamToBytes (stream: Stream) =
    stream.Position <- 0
    let bufferSize = 512
    let decompressedBytes = Array.zeroCreate bufferSize
    use decompressor = new GZipStream(stream, CompressionMode.Decompress)
    decompressor.Read(decompressedBytes, 0, bufferSize)

[<EntryPoint>]
let main _ =
    printfn $"The original string length is {s_messageBytes.Length} bytes."
    use stream = new MemoryStream()
    compressBytesToStream stream
    printfn $"The compressed stream length is {stream.Length} bytes."
    let decompressedLength = decompressStreamToBytes stream
    printfn $"The decompressed string length is {decompressedLength} bytes, same as the original length."
    0

// Output:
//     The original string length is 445 bytes.
//     The compressed stream length is 282 bytes.
//     The decompressed string length is 445 bytes, same as the original length.

Imports System.IO
Imports System.IO.Compression
Imports System.Text

Module MemoryWriteReadExample
    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 ReadOnly s_messageBytes As Byte() = Encoding.ASCII.GetBytes(Message)

    Sub Main()
        Console.WriteLine($"The original string length is {s_messageBytes.Length} bytes.")

        Using stream = New MemoryStream()
            CompressBytesToStream(stream)
            Console.WriteLine($"The compressed stream length is {stream.Length} bytes.")
            Dim decompressedLength As Integer = DecompressStreamToBytes(stream)
            Console.WriteLine($"The decompressed string length is {decompressedLength} bytes, same as the original length.")
        End Using
        ' Output:
        '   The original string length is 445 bytes.
        '   The compressed stream length is 282 bytes.
        '   The decompressed string length is 445 bytes, same as the original length.
    End Sub

    Private Sub CompressBytesToStream(ByVal stream As Stream)
        Using compressor = New GZipStream(stream, CompressionLevel.SmallestSize, leaveOpen:=True)
            compressor.Write(s_messageBytes, 0, s_messageBytes.Length)
        End Using
    End Sub

    Private Function DecompressStreamToBytes(ByVal stream As Stream) As Integer
        stream.Position = 0
        Dim bufferSize As Integer = 512
        Dim decompressedBytes As Byte() = New Byte(bufferSize - 1) {}
        Using decompressor = New GZipStream(stream, CompressionMode.Decompress)
            Dim length As Integer = decompressor.Read(decompressedBytes, 0, bufferSize)
            Return length
        End Using
    End Function
End Module

備註

當您想要指定壓縮效率或速度對類別的 GZipStream 實例而言更為重要，以及是否要在處置 GZipStream 對象之後讓數據流物件保持開啟時，請使用這個建構函式。

適用於

GZipStream(Stream, CompressionMode, Boolean)

來源:: GZipStream.cs

來源:: GZipStream.cs

來源:: GZipStream.cs

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

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

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

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

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

參數

stream: Stream

寫入壓縮數據的數據流，或從中讀取要解壓縮的數據。

mode: CompressionMode

其中一個列舉值，指出要將數據壓縮至數據流，還是從數據流解壓縮數據。

leaveOpen: Boolean

true 表示在處置 GZipStream 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

根據預設， GZipStream 擁有基礎數據流，因此關閉 stream 參數也會關閉基礎數據流。基礎數據流的狀態可能會影響數據流的可用性。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GZipStream實例是以等於 Compress 的參數建立mode，而且不會再執行任何動作，則數據流會顯示為有效的空白壓縮檔案。

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

適用於

GZipStream 建構函式

定義

多載

GZipStream(Stream, CompressionLevel)

參數

例外狀況

備註

適用於

GZipStream(Stream, CompressionMode)

參數

例外狀況

範例

備註

適用於

GZipStream(Stream, CompressionLevel, Boolean)

參數

例外狀況

範例

備註

適用於

GZipStream(Stream, CompressionMode, Boolean)

參數

例外狀況

備註

適用於

意見反應

其他資源