/// <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 = ;

             byte[] content = new byte[BufferSize -  + ];

             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, , BufferSize);

                             rs.Write(content, , 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;

         }