ZipArchiveEntry.Length Property

.NET Framework (current version)
 

Gets the uncompressed size of the entry in the zip archive.

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

Public ReadOnly Property Length As Long

Property Value

Type: System.Int64

The uncompressed size of the entry in the zip archive.

Exception Condition
InvalidOperationException

The value of the property is not available because the entry has been modified.

This property cannot be retrieved when the mode is set to Create, or the mode is set to Update and the entry has been opened.

The following example shows how to retrieve entries from a zip archive, and evaluate the properties of the entries. It uses the Name property to display the name of the entry, and the Length and CompressedLength properties to calculate how much the file was compressed.

Imports System.IO
Imports System.IO.Compression

Module Module1

    Sub Main()
        Dim zipPath As String = "c:\example\result.zip"

        Using archive As ZipArchive = ZipFile.OpenRead(zipPath)
            For Each entry As ZipArchiveEntry In archive.Entries
                Dim compressedRatio As Single = entry.CompressedLength / entry.Length
                Dim reductionPercentage As Single = 100 - (compressedRatio * 100)

                Console.WriteLine(String.Format("File: {0}, Compressed {1:F2}%", entry.Name, reductionPercentage))
            Next
        End Using
    End Sub

End Module

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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