ASP.NET MVC: returning plaintext file to download

问题:

Consider the need to return a plain-text file from a controller method back to the caller. The idea is to have the file downloaded, rather than viewed as plaintext in the browser.

I have the following method, and it works as expected. The file is presented to the browser for download, and the file is populated with the string.

I'd like to look for a 'more correct' implementation of this method, as I am not 100% comfortable with the void return type.

public void ViewHL7(int id)
{
    string someLongTextForDownload = "ABC123";

    Response.Clear(); 
    Response.ContentType = "text/plain";
    Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.hl7", id.ToString()));
    Response.Write(someLongTextForDownload);
    Response.End();
}

回答1:

Use the File method on the controller class to return a FileResult

public ActionResult ViewHL7( int id )
{
    ...

    return File( Encoding.UTF8.GetBytes( someLongTextForDownLoad ),
                 "text/plain",
                  string.Format( "{0}.hl7", id ) );
}

回答2:

You'll want to return a FileContentResult from your method.