创建PDF文件后下载

Question

I have requirement in which i have to create a pdf file. This Pdf file contains some data and it. Now, the main requirement is that after i create the pdf, i should be able to download it. Now the PDF is getting created, But not being able to download it. Please note that its an MVC application.. I am sharing the code for further reference

public class HoldFilesController : Controller
{
    // GET: HoldFiles
    string holdpath = ConfigurationManager.AppSettings["HoldPath"].ToString();
    public ActionResult Index()
    { 
        DirectoryInfo dirInfo = new DirectoryInfo(holdpath);

        List<FileInfo> files = dirInfo.GetFiles().ToList();

        return View("Index",files);
    }

     **The above controller gets filenames from a file directory**

    public ActionResult ViewFile(string[] Name)
    {
        for (int i = 0; i < Name.Length; i++)
        {
            string filepath=holdpath + @"\" + Name[i];

            string result;
            using (StreamReader streamReader = new StreamReader(filepath))
            {
                result = streamReader.ReadToEnd();
            }

            using (System.IO.MemoryStream memoryStream = new System.IO.MemoryStream())
            {
               Document document = new Document(PageSize.A4, 10, 10, 10, 10);

               PdfWriter writer = PdfWriter.GetInstance(document, memoryStream);
               document.Open();

               Paragraph paragraph = new Paragraph();
               paragraph.Add(result);
               document.Add(paragraph);
               document.Close();
               byte[] bytes = memoryStream.ToArray();
               memoryStream.Close();
               Response.ContentType = "application/pdf";
               Response.AppendHeader("Content-Disposition", "attachment; 
filename=MyFile.pdf");
               Response.TransmitFile(Server.MapPath("~/Files/MyFile.pdf"));
               Response.End();
               Response.Close();

            }
        }

The Above controller will get a filename, read the file and create pdf and download. On debugging the code, i can see that document is created. But having trouble in downloading it

Answer 1

You can try something like this:

private FileResult ViewFile(string[] Name)
        {
         //create your file at filePath
           byte[] fileBytes = System.IO.File.ReadAllBytes(filePath);
           return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, "MyFile.pdf"));
        }

Answer 2

It seems that you're using a random file name to download MyFile instead of using the file you just created. First of all, move the Response part outside the using and stop closing MemoryStream there, since the using block will do that for you when it finishes. So outside the using you should write something like:

// Create New instance of FileInfo class to get the properties of the file being downloaded
FileInfo file = new FileInfo(filepath);

// Checking if file exists
if (file.Exists)
{                            
    // Clear the content of the response
    Response.ClearContent();

    // LINE1: Add the file name and attachment, which will force the open/cance/save dialog to show, to the header
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename={0}", file.Name));

    // Add the file size into the response header
    Response.AddHeader("Content-Length", file.Length.ToString());

    // Set the ContentType
    Response.ContentType = ReturnFiletype(file.Extension.ToLower());

    // Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead)
    Response.TransmitFile(file.FullName);

    // End the response
    Response.End();
}