CompressedLength Property

ZipArchiveEntry.CompressedLength Property

.NET Framework 4.6 and 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.

Exception Condition

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\";

            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)); 

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