We Keep Coding

Download file with non-english character in C# using HttpResponse

I am trying to build a functionality to download a csv file in C#.
When the name of the file has non-english character, the downloaded file does not seems to have the correct name. However in the network tab, the response header has the same Content-Disposition value, as given in the code.
Sample Code
private void PopulateCsvInResponse(MemoryStream csvData, string fileName)
{
HttpResponse response = HttpContext.Current.Response;
response.Clear();
//actual file name "Москва.csv"
response.AddHeader("Content-Disposition", "attachment; filename=%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv");
byte[] byteArray = csvData.ToArray();
response.AddHeader("Content-Length", byteArray.Length.ToString());
response.ContentType = "text/csv; charset=utf-8";
response.BinaryWrite(byteArray);
response.Flush();
response.Close();
}
For example the file name is Москва.csv.
UTF-8 encoded name : %D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv.
Things that I tried
Replacing Content-Disposition header
Attempt 1
response.AddHeader("Content-Disposition",
"attachment; filename=Москва.csv");
The downloaded file name is
Ð_оÑ_ква
Attempt 2
response.AddHeader("Content-Disposition",
"attachment; filename=\"%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv\"; filename*=UTF-8''%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv");
The downloaded file name is
_%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv_; filename_
Attempt 3
response.AddHeader("Content-Disposition",
"attachment; filename=%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv");
The downloaded file name is
%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv
Attempt 4
response.AddHeader("Content-Disposition",
"attachment; filename*=UTF-8''%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv");
The downloaded file name is
UTF-8''%D0%9C%D0%BE%D1%81%D0%BA%D0%B2%D0%B0.csv

I finally found out the solution.
The issue was never with above code, it was always working fine.
The actual issue was in front end, where the content disposition header that was received in encode was not decoded, and I skipped to see this part when I raised the question.
I thought of deleting this question, but keeping it so that if someone makes the same silly mistake as me, might realise it earlier instead of wasting time to look for solution for the problem that never existed.

IE11 not respecting filename of content-disposition

My code is opening a PDF in a tab/new window using an .apsx page and the following code:
string fileName = GetFileName(so);
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "inline; filename=" + fileName);
Response.BinaryWrite(pdfStream);
When selecting the save option in the browser for the PDF, the filename in the save dialogue is not being populated correctly in IE (11); it's still using the page name. Chrome and FF are working like I'd expect them too (using the provided filename as the suggested name).
In addition, IE works the same as Chrome and FF when i change the content-disposition to attachment instead of inline. They all use the filename as the suggested save name.
Am I missing something in how to use the inline functionality?

Did you try change inline to attachment ?
Response.AddHeader("content-disposition", "attachment; filename=" + fileName);

ASP Force download txt file sending back source instead

I have a function in ASP that returns a TXT file.
I want the user to download the file but the browser wanted to keep displaying it when I did Response.Redirect("/Dir/Dir/TextFilePath.txt");
So I discovered that if you add this to the header it forces a download
Response.AddHeader("content-disposition",
"attachment;filename=/Dir/Dir/TextFilePath.txt");
And this DOES force download the file, with one catch.
The file is the aspx source code and not my txt file.... It's named correctly but it is most definitely not the txt file.

here is a correct way to download files in asp.net.
note the 'a correct way' and not 'the correct way', you can do it in other ways but this one works for me.
try
{
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment; filename=" + _Filename);
Response.AddHeader("Content-Type", "application/Word");
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Length", _FileLength_in_bytes);
Response.BinaryWrite(_Filedata_bytes);
Response.End();
}
catch (ThreadAbortException)
{ }
finally
{
}
the example above transmits a word file by sending it as a byte array.
you dont have to do it this way, but it works.
also i would like to add for anyone who decides to use my method,
this WILL throw a ThreadAbortException at Response.End().
its a known issue and it affects nothing, everything is being executed correctly but the exception is still thrown, so it must be caught.

You can't affect the headers of the URL supplied for the redirect from the page where the redirect was issued from. I suspect that you actually want to do something like:
var responseText =
File.ReadAllText(Server.MapPath("~/Dir/Dir/TextFilePath.txt"));
Response.ContentType="text/plain";
Response.AddHeader("content-disposition",
"attachment;filename=TextFilePath.txt");
Response.Output.Write(responseText);
Response.End();

Have you tried something like this?
this.Response.AddHeader("content-disposition", "attachment;filename=" + file);
Response.TransmitFile( Server.MapPath(fileName) );
Response.End();

Prompt user to save/open file in ASP.NET C#

It shouldn't be this hard to find out how to do this. Basically I'm trying to take a string and let the client save it when they click a button. It should pop up with a Save/Open dialog. No extra bells and whistles or anything. It's not rocket science, (or so I would've thought).
There seems to be a ton of different ways, (StreamWriter, HttpResponse, etc.), but none of the examples I've been able to find work properly or explain what's going on. Thanks in advance.
An example one of the many blocks of code I've found...
(This is just an example, feel free to not base your answer around this.)
String FileName = "FileName.txt";
String FilePath = "C:/...."; //Replace this
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "text/plain";
response.AddHeader("Content-Disposition", "attachment; filename=" + FileName + ";");
response.TransmitFile(FilePath);
response.Flush();
response.End();
Line 2 says to replace that string. How? This code was advertised as bringing up a dialog. I shouldn't be having to set a path in the code, right?
EDIT: Final Outcome (Edited again, Delete has to come before End();)
string FilePath = Server.MapPath("~/Temp/");
string FileName = "test.txt";
// Creates the file on server
File.WriteAllText(FilePath + FileName, "hello");
// Prompts user to save file
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "text/plain";
response.AddHeader("Content-Disposition", "attachment; filename=" + FileName + ";");
response.TransmitFile(FilePath + FileName);
response.Flush();
// Deletes the file on server
File.Delete(FilePath + FileName);
response.End();

Line 2 (FilePath) indicates the path to the file on the server
Line 8:
response.TransmitFile(FilePath);
Transmits that specific file to the client and THAT is what pops the save dialog.
If you don't transmit the file, I'm not sure if the dialog will pop up at all (even though you set a header)
Anyways, I think line 8 should read:
response.TransmitFile(FilePath + FileName);

There will be a default dialog box by browser, if it will find Response as some file. If you want browser to display that default dialog box, all you need to do is send response to browser as file, which you can do in number of ways:
If it is a static file,
best way is to just mention path of file in anchor tag's href.(obviously if you don't have security concern)
Just out along with your response, the way it is done in your example.
Other ways you can refer here 4 ways to send pdf from asp.net
If it is a dynamic file which you need to generate at run time, you can do a trick, generate the file from filestream, put it in some temporary folder at server, read it back as a static file as mentioned above.

Just use this code it should work to prompt the user to open a dialog for opening or saving the file on the system ....
byte[] bytesPDF = System.IO.File.ReadAllBytes(#"C:\sample.pdf");
if (bytesPDF != null)
{
Response.AddHeader("content-disposition", "attachment;filename= DownloadSample.pdf");
Response.ContentType = "application/octectstream";
Response.BinaryWrite(bytesPDF);
Response.End();
}

FilePath is supposed to point to the file you want to send to the client. This is the path on the server.

ZIP download contains html content

When I use the following code to download a ZIP file it appears to work. However, when I attempt to open the downloaded ZIP, I get an 'invalid compressed folder' message. When I open the ZIP in notepad I see it is filled with HTML.
string fp = Server.MapPath("directory\\file.zip");
FileInfo file = new FileInfo(fp);
if (file.Exists)
{
Response.ClearContent();
Response.AddHeader("content-disposition","attachment; filename=" + file.Name);
Response.AddHeader("content-length", file.Length.ToString());
Response.ContentType = "application/zip";
Response.TransmitFile(file.FullName);
Response.End();
}
An issue I can't seem to fix that is probably related is when I try to manually type in the address of the file (http://website.com/downloads/file.zip), I get a redirect (http://website.com/login.aspx) even when logged in as the admin. Any pointers in where to look would be greatly appreciated.

Instead of just using Response.ClearContent() also use Response.ClearHeaders() to remove all the current headers as well as the body of the response.
From MSDN, HttpResponse.ClearContent Method:
The ClearContent method does not clear header information.