Create ZIP File in Memory in C#. For more details, refer to: https://kb.aspose.com/zip/net/how-to-create-zip-file-in-memory-in-c-sharp/

Create ZIP File in Memory in C#.cs

using System.IO;
// Following namespace is required to Create ZIP File in Memory
using Aspose.Zip;

namespace CreateZipFileInMemory
{
    class Program
    {
        static void Main(string[] args)
        {
            License AsposeZipLicense = new License();
            // Load license from file system into memory stream
            using (MemoryStream stream = new MemoryStream(File.ReadAllBytes("path to license.lic")))
            {
                // Set license prior to creating ZIP file in memory
                AsposeZipLicense.SetLicense(stream);
            }

            #region C# code to create ZIP archive in memory
            // Create MemoryStream instance
            using (MemoryStream zipFileInMemory = new MemoryStream())
            {
                // Create empty Archive object for ZIP file 
                using (Aspose.Zip.Archive zipArchive = new Aspose.Zip.Archive())
                {
                    // Get all files from a Folder and store their paths in string Array
                    string[] filesArray = Directory.GetFiles("ZIP all Files\\", "*.*", SearchOption.TopDirectoryOnly);
                    // Loop through the Array and create an ArchiveEntry against each file within the ZIP Archive
                    foreach (string fileDiskPath in filesArray)
                    {
                        string[] folders = fileDiskPath.Split(new char[] { '\\' });
                        string fileName = folders[folders.Length - 1];

                        zipArchive.CreateEntry(fileName, fileDiskPath);
                    }

                    // Call Save method to create ZIP Archive in memory
                    zipArchive.Save(zipFileInMemory);
                }
            }
            #endregion
        }
    }
}