Web ZIP archive browser

This sample demonstrates the following features:

• Browsing folders of a ZIP archive.
• Using ASP.NET GridView to display a content of a ZIP archive folder.
• Extracting a file from a ZIP archive and sending it through HTTP to the user's web browser.

The following code snippets show the core of this sample:

Binding a ZIP archive folder listing to ASP.NET GridView control:

// open the current ZIP archive
using (ZipArchive archive = new ZipArchive(
    @"c:\temp\archive.zip",
    ArchiveOpenMode.Open,
    ArchiveAccessMode.Read))
{
    // gets the list of files and directories
    // in the root directory of the current ZIP archive
    ZipItemCollection items =
        archive.GetItems("*", TraversalMode.NonRecursive);

    // sort the collection by item path (directories first)
    items.Sort();

    // bind the items to the grid
    ArchiveFilesGridView.DataSource = items;
    ArchiveFilesGridView.DataBind();
}

' open the current ZIP archive
Using archive As New ZipArchive( _
    "c:\temp\archive.zip", _
    ArchiveOpenMode.Open, _
    ArchiveAccessMode.Read)

    ' gets the list of files and directories
    ' in the root of the current ZIP archive
    Dim items As ZipItemCollection = _
        archive.GetItems("*", TraversalMode.NonRecursive)

    ' sort the collection by item path (directories first)
    items.Sort()

    ' bind the items to the grid
    ArchiveFilesGridView.DataSource = items
    ArchiveFilesGridView.DataBind()
End Using

Extracting a file from a ZIP archive and sending it through HTTP to the web browser:

string currentPath = @"\dir\file.txt";
string currentFileName = Path.GetFileName(currentPath);

// open the current ZIP archive
using (ZipArchive archive = new ZipArchive(
    @"c:\temp\archive.zip",
    ArchiveOpenMode.Open,
    ArchiveAccessMode.Read))
{
    // clear response stream and set the response header and content type
    response.Clear();
    response.AddHeader(
        "Content-Disposition",
        string.Format("attachment; filename={0}", currentFileName));

    response.ContentType = "application/octet-stream";

    // extract (decompress) the file from the archive directly
    // to the response stream
    archive.ExtractFile(currentPath, response.OutputStream);
}

// close the current HTTP response and stop executing this page
response.End();

Dim currentPath As String = "\dir\file.txt"
Dim currentFileName As String = Path.GetFileName(currentPath)

' open the current ZIP archive
Using archive As New ZipArchive( _
    "c:\temp\archive.zip", _
    ArchiveOpenMode.Open, _
    ArchiveAccessMode.Read)

    ' clear response stream and set the response header and content type
    response.Clear()
    response.AddHeader( _
        "Content-Disposition", _
        String.Format("attachment; filename={0}", currentFileName))

    response.ContentType = "application/octet-stream"

    ' extract (decompress) the file from the archive directly
    ' to the response stream
    archive.ExtractFile(currentPath, response.OutputStream)
End Using

' close the current HTTP response and stop executing this page
response.[End]()