Previous answers are correct: adding the line...
Response.AddHeader("Content-Disposition", "inline; filename=[filename]");
...will causing multiple Content-Disposition headers to be sent down to the browser. This happens b/c FileContentResult internally applies the header if you supply it with a file name. An alternative, and pretty simple, solution is to simply create a subclass of FileContentResult and override its ExecuteResult() method. Here's an example that instantiates an instance of the System.Net.Mime.ContentDisposition class (the same object used in the internal FileContentResult implementation) and passes it into the new class:
public class FileContentResultWithContentDisposition : FileContentResult
{
private const string ContentDispositionHeaderName = "Content-Disposition";
public FileContentResultWithContentDisposition(byte[] fileContents, string contentType, ContentDisposition contentDisposition)
: base(fileContents, contentType)
{
// check for null or invalid ctor arguments
ContentDisposition = contentDisposition;
}
public ContentDisposition ContentDisposition { get; private set; }
public override void ExecuteResult(ControllerContext context)
{
// check for null or invalid method argument
ContentDisposition.FileName = ContentDisposition.FileName ?? FileDownloadName;
var response = context.HttpContext.Response;
response.ContentType = ContentType;
response.AddHeader(ContentDispositionHeaderName, ContentDisposition.ToString());
WriteFile(response);
}
}
In your Controller, or in a base Controller, you can write a simple helper to instantiate a FileContentResultWithContentDisposition and then call it from your action method, like so:
protected virtual FileContentResult File(byte[] fileContents, string contentType, ContentDisposition contentDisposition)
{
var result = new FileContentResultWithContentDisposition(fileContents, contentType, contentDisposition);
return result;
}
public ActionResult Report()
{
// get a reference to your document or file
// in this example the report exposes properties for
// the byte[] data and content-type of the document
var report = ...
return File(report.Data, report.ContentType, new ContentDisposition {
Inline = true,
FileName = report.FileName
});
}
Now the file will be sent to the browser with the file name you choose and with a content-disposition header of "inline; filename=[filename]".
I hope that helps!
