Specifies values that indicate whether a compression operation emphasizes speed or compression size.
Assembly: System (in System.dll)
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 theenumeration 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 example shows how to set the compression level when creating a zip archive by using the ZipFile class.
Available since 8
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Available since 8.1