c# - FileStream returns Length = 0 -

i'm trying read local file , upload on ftp server. when read image file, ok, when read doc or docx file, filestream returns length = 0. here code: checked other files, appears works fine images , returns 0 other file

if (!ftpclient.fileexists(filename)) {     try     {         ftpclient.validatecertificate += (control, e) => { e.accept = true; };          const int buffer_size = 64 * 1024; // 64kb buffer         byte[] buffer = new byte[buffer_size];         using (stream readstream = new filestream(tempfilepath, filemode.open, fileaccess.read))         using (stream writestream = ftpclient.openwrite(filename))         {             while (readstream.position < readstream.length)             {                 buffer.initialize();                 int bytesread = readstream.read(buffer, 0, buffer_size);                 writestream.write(buffer, 0, bytesread);             }             readstream.flush();             readstream.close();             writestream.flush();             writestream.close();             deletetempfile(tempfilepath);             return true;         }     }     catch (exception ex)     {         return false;     } } 

i couldn't find whats wrong it. please me?

while doesn't answer specific question, don't need know length of stream. keep reading until hit 0 length read. a 0 byte read guaranteed indicate the end of stream.

return value

type: system.int32

the total number of bytes read buffer. can less number of bytes requested if many bytes not available, or 0 (0) if end of stream has been reached.

while (true) {     int bytesread = readstream.read(buffer, 0, buffer_size);     if(bytesread==0)     {         break;     }     writestream.write(buffer, 0, bytesread); } 

alternatively:

readstream.copyto(writestream); 

is concise method of stating goal...