ZipFile.Open Method (String, ZipArchiveMode)

.NET Framework 4.5

Opens a zip archive at the specified path and in the specified mode.

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

public static ZipArchive Open(
	string archiveFileName,
	ZipArchiveMode mode
)

Parameters

archiveFileName
Type: System.String

The path to the archive to open, specified as a relative or absolute path. A relative path is interpreted as relative to the current working directory.

mode
Type: System.IO.Compression.ZipArchiveMode

One of the enumeration values that specifies the actions which are allowed on the entries in the opened archive.

Return Value

Type: System.IO.Compression.ZipArchive
The opened zip archive.

ExceptionCondition
ArgumentException

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

ArgumentNullException

archiveFileName is null.

PathTooLongException

In archiveFileName, 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.

DirectoryNotFoundException

archiveFileName is invalid or does not exist (for example, it is on an unmapped drive).

IOException

archiveFileName could not be opened.

-or-

mode is set to Create, but the file specified in archiveFileName already exists.

UnauthorizedAccessException

archiveFileName specifies a directory.

-or-

The caller does not have the required permission to access the file specified in archiveFileName.

ArgumentOutOfRangeException

mode specifies an invalid value.

FileNotFoundException

mode is set to Read, but the file specified in archiveFileName is not found.

NotSupportedException

archiveFileName contains an invalid format.

InvalidDataException

archiveFileName could not be interpreted as a zip archive.

-or-

mode is Update, but an entry is missing or corrupt and cannot be read.

-or-

mode is Update, but an entry is too large to fit into memory.

When you set the mode parameter to Read, the archive is opened with Open from the FileMode enumeration as the file mode value. If the archive does not exist, a FileNotFoundException exception is thrown. Setting the mode parameter to Read is equivalent to calling the OpenRead method.

When you set the mode parameter to Create, the archive is opened with FileMode.CreateNew as the file mode value. If the archive already exists, an IOException is thrown.

When you set the mode parameter to Update, the archive is opened with FileMode.OpenOrCreate as the file mode value. If the archive exists, it is opened. The existing entries can be modified and new entries can be created. If the archive does not exist, a new archive is created; however, creating a zip archive in Update mode is not as efficient as creating it in Create mode.

The following example shows how to open a zip archive in the update mode and add an entry to the archive.

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

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string zipPath = @"c:\users\exampleuser\start.zip";
            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");
                archive.ExtractToDirectory(extractPath);
            } 
        }
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5

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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