c#实现FTP上传

/// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="fileinfo">需要上传的文件</param>
        /// <param name="targetDir">目标路径</param>
        /// <param name="hostname">ftp地址</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
        {
            //1. check target
            string target;
            if (targetDir.Trim() == "")
            {
                return;
            }
            target = Guid.NewGuid().ToString();  //使用临时文件名


            string URI = "FTP://" + hostname + "/" + targetDir + "/" + target;
            ///WebClient webcl = new WebClient();
            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);

            //设置FTP命令 设置所要执行的FTP命令，
            //ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;//假设此处为显示指定路径下的文件列表
            ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
            //指定文件传输的数据类型
            ftp.UseBinary = true;
            ftp.UsePassive = true;

            //告诉ftp文件大小
            ftp.ContentLength = fileinfo.Length;
            //缓冲大小设置为2KB
            const int BufferSize = 2048;
            byte[] content = new byte[BufferSize - 1 + 1];
            int dataRead;

            //打开一个文件流 (System.IO.FileStream) 去读上传的文件
            using (FileStream fs = fileinfo.OpenRead())
            {
                try
                {
                    //把上传的文件写入流
                    using (Stream rs = ftp.GetRequestStream())
                    {
                        do
                        {
                            //每次读文件流的2KB
                            dataRead = fs.Read(content, 0, BufferSize);
                            rs.Write(content, 0, dataRead);
                        } while (!(dataRead < BufferSize));
                        rs.Close();
                    }

                }
                catch (Exception ex) { }
                finally
                {
                    fs.Close();
                }

            }

            ftp = null;
            //设置FTP命令
            ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名
            ftp.RenameTo = fileinfo.Name;
            try
            {
                ftp.GetResponse();
            }
            catch (Exception ex)
            {
                ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除
                ftp.GetResponse();
                throw ex;
            }
            finally
            {
                //fileinfo.Delete();
            }

            // 可以记录一个日志  "上传" + fileinfo.FullName + "上传到" + "FTP://" + hostname + "/" + targetDir + "/" + fileinfo.Name + "成功." );
            ftp = null;

            #region
            /*****
             *FtpWebResponse
             * ****/
            //FtpWebResponse ftpWebResponse = (FtpWebResponse)ftp.GetResponse();
            #endregion
        }

        private static FtpWebRequest GetRequest(string URI, string username, string password)
        {
            //根据服务器信息FtpWebRequest创建类的对象
            FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
            //提供身份验证信息
            result.Credentials = new System.Net.NetworkCredential(username, password);
            //设置请求完成之后是否保持到FTP服务器的控制连接，默认值为true
            result.KeepAlive = false;
            return result;
        }
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