How to avoid duplicate content-disposition headers with MVC3 FileContentResult?

Question

We have some files stored in sql database. On an ASP.NET MVC3 form, we display 2 links:

View this file | Download this file

These links go to these correspon

Answer 1

When you use the overload File(byte[] contents, string mimeType, string fileName) a Content-Disposition header is automatically added to the response with attachment, so you don't need to add it a second time. For inline you could use the following overload File(byte[] contents, string mimeType) and manually add the Content-Disposition header:

[ActionName("display-file")]
public virtual ActionResult DisplayFile(Guid fileId)
{
    var file = _repos.GetFileInfo(fileId);
    var cd = new ContentDisposition
    {
        Inline = true,
        FileName = file.Name
    };
    Response.AddHeader("Content-Disposition", cd.ToString()); 
    return File(file.Content, file.MimeType);
}

[ActionName("download-file")]
public virtual ActionResult DownloadFile(Guid fileId)
{
    var file = _repos.GetFileInfo(fileId);
    return File(file.Content, file.MimeType, file.Name);
}