ZipFileExtensions.CreateEntryFromFile Method (ZipArchive, String, String, CompressionLevel)

.NET Framework (current version)

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Archives a file by compressing it using the specified compression level and adding it to the zip archive.

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

public static ZipArchiveEntry CreateEntryFromFile(
	this ZipArchive destination,
	string sourceFileName,
	string entryName,
	CompressionLevel compressionLevel


Type: System.IO.Compression.ZipArchive

The zip archive to add the file to.

Type: System.String

The path to the file to be archived. You can specify either a relative or an absolute path. A relative path is interpreted as relative to the current working directory.

Type: System.String

The name of the entry to create in the zip archive.

Type: System.IO.Compression.CompressionLevel

One of the enumeration values that indicates whether to emphasize speed or compression effectiveness when creating the entry.

Return Value

Type: System.IO.Compression.ZipArchiveEntry

A wrapper for the new entry in the zip archive.

Exception Condition

sourceFileName is Empty, contains only white space, or contains at least one invalid character.


entryName is Empty.


sourceFileName or entryName is null.


sourceFileName is invalid (for example, it is on an unmapped drive).


In sourceFileName, the specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must not exceed 248 characters, and file names must not exceed 260 characters.


The file specified by sourceFileName cannot be opened.


sourceFileName specifies a directory.


The caller does not have the required permission to access the file specified by sourceFileName.


The file specified by sourceFileName is not found.


The sourceFileName parameter is in an invalid format.


The zip archive does not support writing.


The zip archive has been disposed.

The new entry in the archive contains the contents of the file specified by sourceFileName. If an entry with the specified name (entryName) already exists in the archive, a second entry is created with an identical name. The LastWriteTime property of the entry is set to the last time the file on the file system was changed.

The following example shows how to create a new entry in a zip archive from an existing file, and specify the compression level.

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

namespace ConsoleApplication
    class Program
        static void Main(string[] args)
            string zipPath = @"c:\users\exampleuser\";
            string extractPath = @"c:\users\exampleuser\extract";
            string newFile = @"c:\users\exampleuser\NewFile.txt";

            using (ZipArchive archive = ZipFile.Open(zipPath, ZipArchiveMode.Update))
                archive.CreateEntryFromFile(newFile, "NewEntry.txt", CompressionLevel.Fastest);

Universal Windows Platform
Available since 10
.NET Framework
Available since 4.5
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