Windows Forms: List all file names in Zip file in C#

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.

To list zip file contents in c#, you need to add a reference to WindowsBase.dll, then add code to handle your windows forms application as shown below.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.IO.Packaging;
using System.Linq;
using System.Reflection;
using System.Windows.Forms;

namespace AppSource
{
    public partial class Form6 : Form
    {
        public Form6()
        {
            InitializeComponent();
        }

        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;
        }

        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;
                }
            }
        }
    }
}

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.

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