为什么upload到ftp上的文件length比local大一些？

Question

如题，

Answer 1

用 .net 4 ftpWebRequest 作的上传工具FtpWebRequest reqFTP;reqFTP = (FtpWebRequest)FtpWebRequest.Create((uploadUrl));
reqFTP.Credentials = new NetworkCredential(username, password);reqFTP.Timeout = 600000; //Set a time limit for the operation to complete.
reqFTP.ReadWriteTimeout = 10000; //when reading or writing to a stream.
reqFTP.KeepAlive = true;
reqFTP.UseBinary = true stMethods.Ftp.UploadFile;
                                const int bufferLength = 2048;
                byte[] buffer = new byte[bufferLength];
                count = 0;
                int readBytes = 0;
                FileStream fs = fi.OpenRead();
                
                Stream requestStream = reqFTP.GetRequestStream();
                do
                {
                    readBytes = fs.Read(buffer, 0, bufferLength);
                    requestStream.Write(buffer, 0, bufferLength);
                    count += readBytes;
                }
                while (readBytes != 0);                requestStream.Close();
                fs.Close();                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close(); 

Answer 2

requestStream.Write(buffer, 0, bufferLength);
也就是即便你的文件小于const int bufferLength = 2048;字节，你也会写一个2048字节出去。估计是大在这里了吧。
换成
requestStream.Write(buffer, 0, readBytes);试试？

Answer 3

requestStream.Write(buffer, 0, bufferLength);
有问题吧！每次都是写2048，应该是读多少写多少！！