using IronZip;
using System;
using System.Collections.Generic;

//  Abrir ZIP existente
using (var archive = new IronZipArchive("existing.zip"))
{
    //  Obtener lista de entradas
    List<Entry> entries = archive.Entries();
    foreach (Entry entry in entries)
    {
        Console.WriteLine(entry.Name);
          }
}

Imports IronZip
Imports System
Imports System.Collections.Generic

'  Abrir ZIP existente
Using archive = New IronZipArchive("existing.zip")
	'  Obtener lista de entradas
	Dim entries As List(Of Entry) = archive.Entries()
	For Each entry As Entry In entries
		Console.WriteLine(entry.Name)
	Next entry
End Using