How to List all file names in Zip file in C#

To list all file names in a zip file in C# using Windows Forms, you can use the System.IO.Packaging namespace from the WindowsBase assembly.

Here's a step-by-step guide on how to achieve this:

To play the demo, we will design a simple UI that allows you to select a zip file, then get file list of files contained in a zip file and show it in the listbox control.

Ensure you have included the necessary namespace:

using System.IO.Packaging;

To list zip file contents in c#, you need to add a reference to WindowsBase.dll, then create methods to list the file names in the zip file as shown below.

public List<string> GetFiles(ZipPackage zp)
{
    List<string> list = new List<string>();
    try
    {
        var zipArchiveProperty = zp.GetType().GetField("_zipArchive", BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Instance);
        var zipArchive = zipArchiveProperty.GetValue(zp);
        var zipFileInfoDictionaryProperty = zipArchive.GetType().GetProperty("ZipFileInfoDictionary", BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Instance);
        var zipFileInfoDictionary = zipFileInfoDictionaryProperty.GetValue(zipArchive, null) as Hashtable;
        var query = from DictionaryEntry de in zipFileInfoDictionary
                    select de.Key.ToString();
        list = query.ToList();
    }
    catch (Exception ex)
    {
        throw ex;
    }
    return list;
}

private List<string> GetFileListFromZipFile(FileInfo zipFileName)
{
    List<string> list = new List<string>();
    try
    {
        var zipPackagep = ZipPackage.Open(zipFileName.FullName, FileMode.Open, FileAccess.Read, FileShare.Read) as ZipPackage;
        list = GetFiles(zipPackagep);
    }
    catch (Exception ex)
    {
        throw ex;
    }
    return list;
}

You need to write the following two methods: GetFiles() and GetFileListFromZipFile(). These two methods will return to you a List<string> containing all the files contained in the Zip archive.

Add a ListBox (listBox1), and a Button (btnZipFile) to your Windows Form, then handle the button click event to select the zip file.

private void btnZipFile_Click(object sender, EventArgs e)
{
    using (OpenFileDialog dialog = new OpenFileDialog())
    {
        if (dialog.ShowDialog() == DialogResult.OK)
        {
            var fi = new FileInfo(dialog.FileName);
            var files = GetFileListFromZipFile(fi);
            listBox1.DataSource = files;
        }
    }
}

This code allows users to select a zip file using a file dialog, and then displays all the file names contained within the zip file in a ListBox using the System.IO.Packaging namespace.

Click the Zip file button to read your zip file, then you can list the contents of a *.zip folder in c#, then display it to the listbox control.