asp.net实现ftp上传代码(解决大文件上传问题)

   原来使用asp.net上传控件上传 那个虽然简单但是页面不是很友好 然后就用了uploadify上传控件  这个控件虽然界面友好 但是大文件还是不能上传 而且在不同的浏览器会出现session丢失问题 所以我到了个ftp上传的方法

    以下是具体代码

using System;   using System.Configuration;   using System.Data;   using System.Linq;   using System.Web;   using System.Web.Security;   using System.Web.UI;   using System.Web.UI.HtmlControls;   using System.Web.UI.WebControls;   using System.Web.UI.WebControls.WebParts;   using System.Xml.Linq;   using System.IO;   using System.Net;   using System.Text;      public partial class _Default : System.Web.UI.Page    {       //以下字段配置在web.config       private string ftpServerIP = "127.0.0.1";//服务器ip       private string ftpUserID = "FTPTEST";//用户名FTPTEST       private string ftpPassword = "ftptest";//密码       protected void Page_Load(object sender, EventArgs e)       {              if (MyFile.Value != "")           {               //string a = MyFile.;           }                  }                               //ftp的上传功能       private void Upload(string filename)       {           FileInfo fileInf = new FileInfo(filename);              string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;           FtpWebRequest reqFTP;              // 根据uri创建FtpWebRequest对象            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));              // ftp用户名和密码           reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);              // 默认为true，连接不会被关闭   // 在一个命令之后被执行           reqFTP.KeepAlive = false;              // 指定执行什么命令           reqFTP.Method = WebRequestMethods.Ftp.UploadFile;              // 指定数据传输类型           reqFTP.UseBinary = true;              // 上传文件时通知服务器文件的大小           reqFTP.ContentLength = fileInf.Length;              // 缓冲大小设置为2kb           int buffLength = 2048;              byte[] buff = new byte[buffLength];           int contentLen;              // 打开一个文件流 (System.IO.FileStream) 去读上传的文件           FileStream fs = fileInf.OpenRead();           try           {               // 把上传的文件写入流               Stream strm = reqFTP.GetRequestStream();                  // 每次读文件流的2kb               contentLen = fs.Read(buff, 0, buffLength);                  // 流内容没有结束               while (contentLen != 0)               {                   // 把内容从file stream 写入 upload stream                   strm.Write(buff, 0, contentLen);                      contentLen = fs.Read(buff, 0, buffLength);               }                  // 关闭两个流               strm.Close();               fs.Close();               this.Page.RegisterStartupScript("", "<script>alert('成功')</script>");           }           catch (Exception ex)           {               // MessageBox.Show(ex.Message, "Upload Error");               Response.Write("Upload Error：" + ex.Message);           }       }             //从ftp服务器上下载文件的功能       private void Download(string filePath, string fileName)       {           FtpWebRequest reqFTP;              try           {               FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);                  reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileName));                  reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;                  reqFTP.UseBinary = true;                  reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);                  FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();                  Stream ftpStream = response.GetResponseStream();                  long cl = response.ContentLength;                  int bufferSize = 2048;                  int readCount;                  byte[] buffer = new byte[bufferSize];                  readCount = ftpStream.Read(buffer, 0, bufferSize);                  while (readCount > 0)               {                   outputStream.Write(buffer, 0, readCount);                      readCount = ftpStream.Read(buffer, 0, bufferSize);               }                  ftpStream.Close();                  outputStream.Close();                  response.Close();           }           catch (Exception ex)           {               Response.Write("Download Error：" + ex.Message);           }       }          //从ftp服务器上获得文件列表       public string[] GetFileList()       {           string[] downloadFiles;           StringBuilder result = new StringBuilder();           FtpWebRequest reqFTP;           // HttpWebRequest reqFTP;           try           {               reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/"));               reqFTP.UseBinary = true;               reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);               reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;               WebResponse response = reqFTP.GetResponse();               StreamReader reader = new StreamReader(response.GetResponseStream());               string line = reader.ReadLine();               while (line != null)               {                   result.Append(line);                   result.Append("\n");                   line = reader.ReadLine();               }               // to remove the trailing '\n'                       result.Remove(result.ToString().LastIndexOf('\n'), 1);               reader.Close();               response.Close();               return result.ToString().Split('\n');           }           catch (Exception ex)           {               downloadFiles = null;               return downloadFiles;           }       }          protected void Button1_Click(object sender, EventArgs e)       {           Upload("F:\\美国队长DVD中字.rmvb");       }       protected void Button2_Click(object sender, EventArgs e)       {          }   }