CompressionLevel Enumeration

.NET Framework (current version)

Specifies values that indicate whether a compression operation emphasizes speed or compression size.

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

type CompressionLevel

Member nameDescription

The compression operation should complete as quickly as possible, even if the resulting file is not optimally compressed.


No compression should be performed on the file.


The compression operation should be optimally compressed, even if the operation takes a longer time to complete.

Compression operations usually involve a tradeoff between the speed and the effectiveness of compression. You use the CompressionLevel enumeration to indicate which factor is more important in your development scenario: the time to complete the compression operation or the size of the compressed file. These values do not correspond to specific compression levels; the object that implements compression determines how to handle them.

The following methods of the DeflateStream, GZipStream, ZipArchive, ZipFile, and ZipFileExtensions classes include a parameter named compressionLevel that lets you specify the compression level:

The following example shows how to set the compression level when creating a zip archive by using the ZipFile class.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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