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GZipStream Constructor (Stream, CompressionMode)

Initializes a new instance of the GZipStream class using the specified stream and CompressionMode value.

Namespace:  System.IO.Compression
Assembly:  System (in System.dll)

public GZipStream(
	Stream stream,
	CompressionMode mode
)

Parameters

stream
Type: System.IO.Stream

The stream to compress or decompress.

mode
Type: System.IO.Compression.CompressionMode

One of the CompressionMode values that indicates the action to take.

ExceptionCondition
ArgumentNullException

stream is null.

InvalidOperationException

stream access right is ReadOnly and mode value is Compress.

ArgumentException

mode is not a valid CompressionMode enumeration value.

-or-

CompressionMode is Compress and CanWrite is false.

-or-

CompressionMode is Decompress and CanRead is false.

By default, GZipStream owns the underlying stream, so closing the stream parameter also closes the underlying stream. Note that the state of the underlying stream can affect the usability of the stream. Also, no explicit checks are performed, so no additional exceptions are thrown when the new instance is created.

If an instance of the GZipStream class is created with the mode parameter equal to Compress and no further action occurs, the stream will appear as a valid, empty compressed file.

Using the GZipStream class to compress a file larger than 4 GB raises an exception.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5

XNA Framework

Supported in: 3.0

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