无法提示保存对话框以在 MVC 中下载 zip 文件

Question

我的 MVC 视图中有 jqgrid，它显示了可用文件的数量。选中 jqGrid 每一行的复选框后，用户可以下载单个文件或 zip 格式的多个文件。单个文件下载工作正常并且能够提示用户保存文件但是当我以 zip 格式下载文件时，我没有得到任何保存提示来将文件保存在客户端计算机上。 Zip 文件在文件夹中创建正常，但不提示保存。我不知道我在哪里做错了。请参阅以下代码并在此问题上帮助我....

    **Controller**
    [HttpGet]
    public ActionResult DownloadZip(String[] filesToZip)
    {
        //checking if there any file to zip
        if (filesToZip == null || filesToZip.Length < 1 || filesToZip.Count() == 0)
            return (new EmptyResult());

        //creating dynamic zip file name
        var downloadFileName = string.Format("Test_{0}.zip", DateTime.Now.ToString("yyyy-MM-dd-HH_mm_ss"));

        //zipping the files
        using (ZipOutputStream zipos = new ZipOutputStream(System.IO.File.Create(Path.Combine(Server.MapPath(uploadLocation), downloadFileName))))
        {
            // 0-9, 9 being the highest compression
            zipos.SetLevel(9);

            //temp buffer to hold 4gb data max
            byte[] buffer = new byte[4096];

            foreach (string file in filesToZip)
            {
                ZipEntry newEntry = new ZipEntry(Path.GetFileName(file));
                zipos.PutNextEntry(newEntry);

                using (FileStream fs = System.IO.File.OpenRead(file))
                {
                    int sourceBytes;
                    do
                    {
                        sourceBytes = fs.Read(buffer, 0, buffer.Length);
                        zipos.Write(buffer, 0, sourceBytes);
                    }
                    while (sourceBytes > 0);
                }
            }//end files loop
        }


        System.IO.FileInfo zipFile = new System.IO.FileInfo(Path.Combine(Server.MapPath(uploadLocation), downloadFileName));

        // clear the current output content from the buffer
        Response.Clear();

        // add the header that specifies the default filename for the 
        // Download/SaveAs dialog 
        Response.AddHeader("Content-Disposition", "attachment; filename=" + downloadFileName);

        // add the header that specifies the file size, so that the browser
        // can show the download progress
        Response.AddHeader("Content-Length", zipFile.Length.ToString());

        // specify that the response is a stream that cannot be read by the
        // client and must be downloaded
        Response.ContentType = "application/zip";
        // send the file stream to the client
        Response.WriteFile(zipFile.FullName);


        //ControllerContext.HttpContext.Response.AddHeader("content-disposition", "attachment; filename=" + downloadFileName);
        //return File(Path.Combine(Server.MapPath(uploadLocation), downloadFileName), "application/zip", downloadFileName);

        return (new EmptyResult());
   }

   **View**

            $("#btnDownloadZip").click(function () {

                var files = $("#list").jqGrid('getGridParam', 'selarrrow').toString();

                if (files == '') {
                    alert('Please select a file to download...');
                    return;
                }

                var fileList = files.split(",");

                $.post('<%= Url.Action("DownloadZip") %>', { filesToZip: fileList }, handleSuccess);

                //$.getJSON("/Home/DownloadZip/", { filesToZip: fileList });
            });
     function handleSuccess()
     {
     }

Answer 1

Asp.Net MVC 有一个函数名称 File，您可以使用它从控制器操作中返回文件。

请参阅this 显示如何返回文件的问题