我正在使用.NET 4 C＃。我正在嘗試上傳ZIP文件，然后將其下載到（我的）服務(wù)器。對(duì)于上傳我有using (WebClient client = new WebClient()){    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(MyUrl);    request.Method = WebRequestMethods.Ftp.UploadFile;    request.EnableSsl = false;    request.Credentials = new NetworkCredential(MyLogin, MyPassword);    byte[] fileContents = null;    using (StreamReader sourceStream = new StreamReader(LocalFilePath))    {        fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());    }    request.ContentLength = fileContents.Length;    using (Stream requestStream = request.GetRequestStream())    {        requestStream.Write(fileContents, 0, fileContents.Length);    }    FtpWebResponse response = null;    response = (FtpWebResponse)request.GetResponse();    response.Close();}這似乎可行，因?yàn)槲以诜?wù)器上獲得了正確大小的文件。1）我如何流式傳輸它，而不是先將其加載到內(nèi)存中？我將上傳非常大的文件。對(duì)于下載，我有using (WebClient client = new WebClient()){    string HtmlResult = String.Empty;    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(remoteFile);    request.Method = WebRequestMethods.Ftp.DownloadFile;    request.EnableSsl = false;    request.Credentials = new NetworkCredential(MyLogin, MyPassword);    using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())    using (Stream responseStream = response.GetResponseStream())    using (StreamReader reader = new StreamReader(responseStream))    using (FileStream writer = new FileStream(localFilename, FileMode.Create))    {        long length = response.ContentLength;        int bufferSize = 2048;        int readCount;        byte[] buffer = new byte[2048];        readCount = responseStream.Read(buffer, 0, bufferSize);        while (readCount > 0)        {            writer.Write(buffer, 0, readCount);            readCount = responseStream.Read(buffer, 0, bufferSize);        }    }}2）一切似乎都可以正常工作……除了當(dāng)我嘗試解壓縮下載的ZIP文件時(shí)，我得到的是無(wú)效的ZIP文件。