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ZipArchiveEntry.CompressedLength Property

.NET Framework 4.5

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

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

public long CompressedLength { get; }

Property Value

Type: System.Int64
The compressed size of the entry in the zip archive.

ExceptionCondition
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 in 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.

using System;
using System.IO;
using System.IO.Compression;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string zipPath = @"c:\example\result.zip";

            using (ZipArchive archive = ZipFile.OpenRead(zipPath))
            {
                foreach (ZipArchiveEntry entry in archive.Entries)
                {
                    float compressedRatio = (float)entry.CompressedLength / entry.Length;
                    float reductionPercentage = 100 - (compressedRatio * 100);

                    Console.WriteLine (string.Format("File: {0}, Compressed {1:F2}%", entry.Name, reductionPercentage)); 
                }
            } 
        }
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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