CODEWITHSUNDEEP
c#asp.net-mvcimagedownloadcontroller
RSolberg
RSolberg

Reputation: 26972

ASP.NET MVC download image rather than display in browser

Rather than displaying a PNG in the browser window, I'd like the action result to trigger the file download dialogue box (you know the open, save as, etc). I can get this to work with the code below using an unknown content type, but the user then has to type in .png at the end of the file name. How can I accomplish this behavior without forcing the user to type in the file extension?

    public ActionResult DownloadAdTemplate(string pathCode)
    {
        var imgPath = Server.MapPath(service.GetTemplatePath(pathCode));
        return base.File(imgPath, "application/unknown");
    }

Solution....

    public ActionResult DownloadAdTemplate(string pathCode)
    {
        var imgPath = Server.MapPath(service.GetTemplatePath(pathCode));
        Response.AddHeader("Content-Disposition", "attachment;filename=DealerAdTemplate.png");
        Response.WriteFile(imgPath);
        Response.End();
        return null;
    }

Upvotes: 36

Views: 41986

Answers (6)

NoWar
NoWar

Reputation: 37633

The correct way to download file in your case is to use FileResult class.

 public FileResult DownloadFile(string id)
{
try
{
    byte[] imageBytes =  ANY IMAGE SOURCE (PNG)
    MemoryStream ms = new MemoryStream(imageBytes);
    var image = System.Drawing.Image.FromStream(ms);
    image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
    var fileName = string.Format("{0}.png", "ANY GENERIC FILE NAME");
    return File(ms.ToArray(), "image/png", fileName);
}
catch (Exception)
{
}
return null;
}

Upvotes: 2

Iain M Norman
Iain M Norman

Reputation: 2085

With MVC I use a FileResult and return a FilePathResult

public FileResult ImageDownload(int id)
    {
        var image = context.Images.Find(id);
        var imgPath = Server.MapPath(image.FilePath);
        return File(imgPath, "image/jpeg", image.FileName);
    }

Upvotes: 3

user714055
user714055

Reputation:

This I actually @7072k3

var result = File(path, mimeType, fileName);
Response.ContentType = mimeType;
Response.AddHeader("Content-Disposition", "inline");
return result;

Copied that from my working code. This still uses the standard ActionResult return type.

Upvotes: 1

Paul Totzke
Paul Totzke

Reputation: 1440

I actually came here because I was looking for the opposite effect.

    public ActionResult ViewFile()
    {
        string contentType = "Image/jpeg";



        byte[] data = this.FileServer("FileLocation");

        if (data == null)
        {
            return this.Content("No picture for this program.");
        }

        return File(data, contentType, img + ".jpg");
    }

Upvotes: 7

womp
womp

Reputation: 116977

I believe you can control this with the content-disposition header.

Response.AddHeader(
       "Content-Disposition", "attachment; filename=\"filenamehere.png\"");

Upvotes: 42

Aren
Aren

Reputation: 55946

You need to set the following headers on the response:

  • Content-Disposition: attachment; filename="myfile.png"
  • Content-Type: application/force-download

Upvotes: 11

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