DefaultCompressionMethod Property

Gets or sets the default Xceed.Compression.CompressionMethod that will be applied to the file(s) that are added to the zip file.

Syntax

Visual Basic
C#

'Declaration
 
Public Overridable Property DefaultCompressionMethod As CompressionMethod

'Usage
 
Dim instance As ZipArchive

Dim value As CompressionMethod

 

instance.DefaultCompressionMethod = value

 

value = instance.DefaultCompressionMethod

public virtual CompressionMethod DefaultCompressionMethod {get; set;}

Property Value

The default Xceed.Compression.CompressionMethod that will be applied to the file(s) that are added to the zip file.

Remarks

The PPMd algorithm uses a custom memory management system called SubAllocator. In a zip file, the memory size the SubAllocator uses is defined in the WinZip PPMd header for the compressed file and this header's value is used when decompressing the data. In general, WinZip uses 64Mb. Since the algorithm used was not optimized from the original PPMd version I revision 1, the SubAllocator initially requires the total amount of memory specified in the PPMd compressor. This means you must have at least 64 free Mb of RAM when using this compression method.

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

ZipArchive Class
ZipArchive Members