C# - Error With Content-disposition?
May 17, 2010
how should I handle an exception that occurs after sending a Content-Disposition header for an attachment? I'm trying to generate a report at server and send it as a file, but if an exception occurs during the report generation, the error message itself is sent to browser which still takes it as a content of a file and shows a Save As dialog. User cannot know there was an error generating report, saves the file which is in wrong format now.Is there a way to cancel the response with this header and redirect to an error page? Or what else can I do to inform user about the error?
Probably I could generate the report first and only if there was no error send the headers, but I want the report render directly to the Response output stream so that it does not need to stay in memory.
Here is my code:
this.Response.ContentType = "application/octet-stream";
this.Response.AddHeader("Content-Disposition", @"attachment; filename=""" + item.Name + @"""");
this.Response.Flush();
GenerateReportTo(this.Response.OutputStream); // Exception occurs
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[code].....
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The Code i used is here....
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private string ReturnExtension(string fileExtension)
{
switch (fileExtension)
{
case ".txt":
return "text/plain";
case ".doc":
return "application/ms-word";
case ".xls":
return "application/vnd.ms-excel";
case ".gif":
return "image/gif";
case ".jpg":
case "jpeg":
return "image/jpeg";
case ".bmp":
return "image/bmp";
case ".wav":
return "audio/wav";
case ".ppt":
return "application/mspowerpoint";
case ".dwg":
return "image/vnd.dwg";
default:
return "application/octet-stream";
}
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