How to add Headers in HTTPContext Response in ASP.NET MVC 3?

Question

I have a download link in my page, to a file I generate by the user request. Now I want to display the file size, so the browser can display how much is left to download. As

Answer 1

This should solve it as I think there's no need to use the FileStreamResult, when you can use the byte[] directly.

public FileContentResult DownloadSignalRecord(long id, long powerPlantID, long generatingUnitID)
{
    SignalRepository sr = new SignalRepository();
    var file = sr.GetRecordFile(powerPlantID, generatingUnitID, id);

    HttpContext.Response.AddHeader("Content-Length", file.Length.ToString());

    return File(file, "binary/RFX", sr.GetRecordName(powerPlantID, generatingUnitID, id) + ".rfx");
}

Note the FileContentResult return type.