尝试上传时,C#覆盖带有空文件的文件(ftp)

Question

我试图通过ftp上传文本文件,当我运行程序时,它清空我的文件,然后上传它.我不知道为什么......可能会覆盖或其他东西......这是我的代码:

这是在Main类

        /* Create Object Instance */
        ftp ftpClient = new ftp(@"ftp://sportcaffe.me", "sport***", "*****");

        /* Upload a File */
        ftpClient.upload("public_html/test.txt", @"C:\Users\Lazar\Desktop\test.txt");

这里是ftp类的功能代码:

/* Upload File */
    public void upload(string remoteFile, string localFile)
    {
        try
        {
            /* Create an FTP Request */
            ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + remoteFile);
            /* Log in to the FTP Server with the User Name and Password Provided */
            ftpRequest.Credentials = new NetworkCredential(user, pass);
            /* When in doubt, use these options */
            ftpRequest.UseBinary = true;
            ftpRequest.UsePassive = true;
            ftpRequest.KeepAlive = true;
            /* Specify the Type of FTP Request */
            ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;
            /* Establish Return Communication with the FTP Server */
            ftpStream = ftpRequest.GetRequestStream();
            /* Open a File Stream to Read the File for Upload */
            FileStream localFileStream = new FileStream(localFile, FileMode.Create);
            /* Buffer for the Downloaded Data */
            byte[] byteBuffer = new byte[bufferSize];
            int bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
            /* Upload the File by Sending the Buffered Data Until the Transfer is Complete */
            try
            {
                while (bytesSent != 0)
                {
                    ftpStream.Write(byteBuffer, 0, bytesSent);
                    bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
                }
            }
            catch (Exception ex) { MessageBox.Show(ex.ToString()); }
            /* Resource Cleanup */
            localFileStream.Close();
            ftpStream.Close();
            ftpRequest = null;
        }
        catch (Exception ex) { MessageBox.Show(ex.ToString()); }
        return;
    }

没有错误和警告......

首先我在我的文件中写一些内容然后保存,然后当我运行程序时,我的文件是空的,并且已经上传了empy文件...

我用这个代码http://www.codeproject.com/Tips/443588/Simple-Csharp-FTP-Class

Answer 1

FileStream localFileStream = new FileStream(localFile, FileMode.Create);

我希望我不需要太清楚地说明这一点,但上述行被告知要创建一个文件.引用文档:"指定操作系统应该创建一个新文件.如果文件已经存在,它将被覆盖."

http://msdn.microsoft.com/en-us/library/system.io.filemode(v=vs.110).aspx有一个可以在这里使用的选项列表.FileMode.Open应该对你的需求有好处(它将打开文件,如果文件不存在则抛出异常).