使用HttpHandler下载.zip目录

using System;
using System.IO;
using System.IO.Compression;
using System.Web;

public class DownloadHandler : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        string zipPath = "path/to/zip/directory"; // 替换为要下载的.zip目录的路径

        string zipFileName = "download.zip";
        string tempFolderPath = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());

        try
        {
            Directory.CreateDirectory(tempFolderPath);

            string tempZipFilePath = Path.Combine(tempFolderPath, zipFileName);

            using (ZipArchive zipArchive = ZipFile.Open(tempZipFilePath, ZipArchiveMode.Create))
            {
                foreach (string file in Directory.GetFiles(zipPath))
                {
                    zipArchive.CreateEntryFromFile(file, Path.GetFileName(file));
                }
            }

            context.Response.Clear();
            context.Response.ContentType = "application/zip";
            context.Response.AddHeader("Content-Disposition", "attachment; filename=" + zipFileName);
            context.Response.TransmitFile(tempZipFilePath);
            context.Response.Flush();
        }
        finally
        {
            Directory.Delete(tempFolderPath, true);
        }
    }

    public bool IsReusable
    {
        get { return false; }
    }
}

<configuration>
  <system.web>
    <httpHandlers>
      <add verb="GET" path="DownloadHandler.ashx" type="DownloadHandler" />
    </httpHandlers>
  </system.web>
</configuration>