c# from 中直接下载和上传iis中的文件。

using System.Globalization;
using System.Net.NetworkInformation;
using System .Net;

//2017-2-23

/// <summary>
/// ftp文件上传、下载操作类
/// </summary>
/// <summary>
/// ftp用户名，匿名为“”
/// </summary>
private string ftpUser;

/// <summary>
/// ftp用户密码，匿名为“”
/// </summary>
private string ftpPassWord;

/// <summary>
///通过用户名，密码连接到FTP服务器
/// </summary>
/// <param name="ftpUser">ftp用户名，匿名为“”</param>
/// <param name="ftpPassWord">ftp登陆密码，匿名为“”</param>
public void FTPHelper(string ftpUser, string ftpPassWord)
{
this.ftpUser = ftpUser;
this.ftpPassWord = ftpPassWord;
}

/// <summary>
/// 匿名访问
/// </summary>
public void FTPHelper()
{
this.ftpUser = "";
this.ftpPassWord = "";
}

/// <summary>
/// 上传文件到Ftp服务器
/// </summary>
/// <param name="uri">把上传的文件保存为ftp服务器文件的uri,如"ftp://192.168.1.104/capture-212.avi"</param>
/// <param name="upLoadFile">要上传的本地的文件路径，如D:capture-2.avi</param>
public void UpLoadFile(string UpLoadUri, string upLoadFile)
{
Stream requestStream = null;
FileStream fileStream = null;
FtpWebResponse uploadResponse = null;

try
{
Uri uri = new Uri(UpLoadUri);

FtpWebRequest uploadRequest = (FtpWebRequest)WebRequest.Create(uri);
uploadRequest.Method = WebRequestMethods.Ftp.UploadFile;

uploadRequest.Credentials = new NetworkCredential(ftpUser, ftpPassWord);

requestStream = uploadRequest.GetRequestStream();
fileStream = File.Open(upLoadFile, FileMode.Open);

byte[] buffer = new byte[1024];
int bytesRead;
while (true)
{
bytesRead = fileStream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
break;
requestStream.Write(buffer, 0, bytesRead);
}

requestStream.Close();

uploadResponse = (FtpWebResponse)uploadRequest.GetResponse();

}
catch (Exception ex)
{
throw new Exception("上传文件到ftp服务器出错，文件名：" + upLoadFile + "异常信息：" + ex.ToString());
}
finally
{
if (uploadResponse != null)
uploadResponse.Close();
if (fileStream != null)
fileStream.Close();
if (requestStream != null)
requestStream.Close();
}
}

/// <summary>
/// 从ftp下载文件到本地服务器
/// </summary>
/// <param name="downloadUrl">要下载的ftp文件路径，如ftp://192.168.1.104/capture-2.avi</param>
/// <param name="saveFileUrl">本地保存文件的路径，如(@"d:capture-22.avi"</param>
public void DownLoadFile(string downloadUrl, string saveFileUrl)
{
Stream responseStream = null;
FileStream fileStream = null;
StreamReader reader = null;

try
{
// string downloadUrl = "ftp://192.168.1.104/capture-2.avi";

FtpWebRequest downloadRequest = (FtpWebRequest)WebRequest.Create(downloadUrl);
downloadRequest.Method = WebRequestMethods.Ftp.DownloadFile;

//string ftpUser = "yoyo";
//string ftpPassWord = "123456";
downloadRequest.Credentials = new NetworkCredential(ftpUser, ftpPassWord);

FtpWebResponse downloadResponse = (FtpWebResponse)downloadRequest.GetResponse();
responseStream = downloadResponse.GetResponseStream();

fileStream = File.Create(saveFileUrl);
byte[] buffer = new byte[1024];
int bytesRead;
while (true)
{
bytesRead = responseStream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
break;
fileStream.Write(buffer, 0, bytesRead);
}
}
catch (Exception ex)
{
throw new Exception("从ftp服务器下载文件出错，文件名：" + downloadUrl + "异常信息：" + ex.ToString());
}
finally
{
if (reader != null)
{
reader.Close();
}
if (responseStream != null)
{
responseStream.Close();
}
if (fileStream != null)
{
fileStream.Close();
}
}
}


/// <summary>
/// 从FTP下载文件到本地服务器,支持断点下载
/// </summary>
/// <param name="ftpUri">ftp文件路径，如"ftp://localhost/test.txt"</param>
/// <param name="saveFile">保存文件的路径，如C:\test.txt</param>
public void BreakPointDownLoadFile(string ftpUri, string saveFile)
{
System.IO.FileStream fs = null;
System.Net.FtpWebResponse ftpRes = null;
System.IO.Stream resStrm = null;
try
{
//下载文件的URI
Uri u = new Uri(ftpUri);
//设定下载文件的保存路径
string downFile = saveFile;

//FtpWebRequest的作成
System.Net.FtpWebRequest ftpReq = (System.Net.FtpWebRequest)
System.Net.WebRequest.Create(u);
//设定用户名和密码
ftpReq.Credentials = new System.Net.NetworkCredential(ftpUser, ftpPassWord);
//MethodにWebRequestMethods.Ftp.DownloadFile("RETR")设定
ftpReq.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
//要求终了后关闭连接
ftpReq.KeepAlive = false;
//使用ASCII方式传送
ftpReq.UseBinary = false;
//设定PASSIVE方式无效
ftpReq.UsePassive = false;

//判断是否继续下载
//继续写入下载文件的FileStream

if (System.IO.File.Exists(downFile))
{
//继续下载
ftpReq.ContentOffset = (new System.IO.FileInfo(downFile)).Length;
fs = new System.IO.FileStream(
downFile, System.IO.FileMode.Append, System.IO.FileAccess.Write);
}
else
{
//一般下载
fs = new System.IO.FileStream(
downFile, System.IO.FileMode.Create, System.IO.FileAccess.Write);
}

//取得FtpWebResponse
ftpRes = (System.Net.FtpWebResponse)ftpReq.GetResponse();
//为了下载文件取得Stream
resStrm = ftpRes.GetResponseStream();
//写入下载的数据
byte[] buffer = new byte[1024];
while (true)
{
int readSize = resStrm.Read(buffer, 0, buffer.Length);
if (readSize == 0)
break;
fs.Write(buffer, 0, readSize);
}
}
catch (Exception ex)
{
throw new Exception("从ftp服务器下载文件出错，文件名：" + ftpUri + "异常信息：" + ex.ToString());
}
finally
{
fs.Close();
resStrm.Close();
ftpRes.Close();
}
}

#region 从FTP上下载整个文件夹，包括文件夹下的文件和文件夹

/// <summary>
/// 列出FTP服务器上面当前目录的所有文件和目录
/// </summary>
/// <param name="ftpUri">FTP目录</param>
/// <returns></returns>
public List<FileStruct> ListFilesAndDirectories(string ftpUri)
{
WebResponse webresp = null;
StreamReader ftpFileListReader = null;
FtpWebRequest ftpRequest = null;
try
{
ftpRequest = (FtpWebRequest)WebRequest.Create(new Uri(ftpUri));
ftpRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
ftpRequest.Credentials = new NetworkCredential(ftpUser, ftpPassWord);
webresp = ftpRequest.GetResponse();
ftpFileListReader = new StreamReader(webresp.GetResponseStream(), Encoding.Default);
}
catch (Exception ex)
{
throw new Exception("获取文件列表出错，错误信息如下：" + ex.ToString());
}
string Datastring = ftpFileListReader.ReadToEnd();
return GetList(Datastring);

}

/// <summary>
/// 列出FTP目录下的所有文件
/// </summary>
/// <param name="ftpUri">FTP目录</param>
/// <returns></returns>
public List<FileStruct> ListFiles(string ftpUri)
{
List<FileStruct> listAll = ListFilesAndDirectories(ftpUri);
List<FileStruct> listFile = new List<FileStruct>();
foreach (FileStruct file in listAll)
{
if (!file.IsDirectory)
{
listFile.Add(file);
}
}
return listFile;
}


/// <summary>
/// 列出FTP目录下的所有目录
/// </summary>
/// <param name="ftpUri">FRTP目录</param>
/// <returns>目录列表</returns>
public List<FileStruct> ListDirectories(string ftpUri)
{
List<FileStruct> listAll = ListFilesAndDirectories(ftpUri);
List<FileStruct> listDirectory = new List<FileStruct>();
foreach (FileStruct file in listAll)
{
if (file.IsDirectory)
{
listDirectory.Add(file);
}
}
return listDirectory;
}

/// <summary>
/// 获得文件和目录列表
/// </summary>
/// <param name="datastring">FTP返回的列表字符信息</param>
private List<FileStruct> GetList(string datastring)
{
List<FileStruct> myListArray = new List<FileStruct>();
string[] dataRecords = datastring.Split(' ');
FileListStyle _directoryListStyle = GuessFileListStyle(dataRecords);
foreach (string s in dataRecords)
{
if (_directoryListStyle != FileListStyle.Unknown && s != "")
{
FileStruct f = new FileStruct();
f.Name = "..";
switch (_directoryListStyle)
{
case FileListStyle.UnixStyle:
f = ParseFileStructFromUnixStyleRecord(s);
break;
case FileListStyle.WindowsStyle:
f = ParseFileStructFromWindowsStyleRecord(s);
break;
}
if (!(f.Name == "." || f.Name == ".."))
{
myListArray.Add(f);
}
}
}
return myListArray;
}
/// <summary>
/// 从Unix格式中返回文件信息
/// </summary>
/// <param name="Record">文件信息</param>
private FileStruct ParseFileStructFromUnixStyleRecord(string Record)
{
FileStruct f = new FileStruct();
string processstr = Record.Trim();
f.Flags = processstr.Substring(0, 10);
f.IsDirectory = (f.Flags[0] == 'd');
processstr = (processstr.Substring(11)).Trim();
_cutSubstringFromStringWithTrim(ref processstr, ' ', 0); //跳过一部分
f.Owner = _cutSubstringFromStringWithTrim(ref processstr, ' ', 0);
f.Group = _cutSubstringFromStringWithTrim(ref processstr, ' ', 0);
_cutSubstringFromStringWithTrim(ref processstr, ' ', 0); //跳过一部分
string yearOrTime = processstr.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)[2];
if (yearOrTime.IndexOf(":") >= 0) //time
{
processstr = processstr.Replace(yearOrTime, DateTime.Now.Year.ToString());
}
f.CreateTime = DateTime.Parse(_cutSubstringFromStringWithTrim(ref processstr, ' ', 8));
f.Name = processstr; //最后就是名称
return f;
}

/// <summary>
/// 从Windows格式中返回文件信息
/// </summary>
/// <param name="Record">文件信息</param>
private FileStruct ParseFileStructFromWindowsStyleRecord(string Record)
{
FileStruct f = new FileStruct();
string processstr = Record.Trim();
string dateStr = processstr.Substring(0, 8);
processstr = (processstr.Substring(8, processstr.Length - 8)).Trim();
string timeStr = processstr.Substring(0, 7);
processstr = (processstr.Substring(7, processstr.Length - 7)).Trim();
DateTimeFormatInfo myDTFI = new CultureInfo("en-US", false).DateTimeFormat;
myDTFI.ShortTimePattern = "t";
f.CreateTime = DateTime.Parse(dateStr + " " + timeStr, myDTFI);
if (processstr.Substring(0, 5) == "<DIR>")
{
f.IsDirectory = true;
processstr = (processstr.Substring(5, processstr.Length - 5)).Trim();
}
else
{
string[] strs = processstr.Split(new char[] { ' ' },2);// StringSplitOptions.RemoveEmptyEntries); // true);
processstr = strs[1];
f.IsDirectory = false;
}
f.Name = processstr;
return f;
}
/// <summary>
/// 按照一定的规则进行字符串截取
/// </summary>
/// <param name="s">截取的字符串</param>
/// <param name="c">查找的字符</param>
/// <param name="startIndex">查找的位置</param>
private string _cutSubstringFromStringWithTrim(ref string s, char c, int startIndex)
{
int pos1 = s.IndexOf(c, startIndex);
string retString = s.Substring(0, pos1);
s = (s.Substring(pos1)).Trim();
return retString;
}
/// <summary>
/// 判断文件列表的方式Window方式还是Unix方式
/// </summary>
/// <param name="recordList">文件信息列表</param>
private FileListStyle GuessFileListStyle(string[] recordList)
{
foreach (string s in recordList)
{
if (s.Length > 10
&& Regex.IsMatch(s.Substring(0, 10), "(-|d)(-|r)(-|w)(-|x)(-|r)(-|w)(-|x)(-|r)(-|w)(-|x)"))
{
return FileListStyle.UnixStyle;
}
else if (s.Length > 8
&& Regex.IsMatch(s.Substring(0, 8), "[0-9][0-9]-[0-9][0-9]-[0-9][0-9]"))
{
return FileListStyle.WindowsStyle;
}
}
return FileListStyle.Unknown;
}

/// <summary>
/// 从FTP下载整个文件夹
/// </summary>
/// <param name="ftpDir">FTP文件夹路径</param>
/// <param name="saveDir">保存的本地文件夹路径</param>
public void DownFtpDir(string ftpDir, string saveDir)
{
List<FileStruct> files = ListFilesAndDirectories(ftpDir);
if (!Directory.Exists(saveDir))
{
Directory.CreateDirectory(saveDir);
}
foreach (FileStruct f in files)
{
if (f.IsDirectory) //文件夹，递归查询
{
DownFtpDir(ftpDir + "/" + f.Name, saveDir + "\" + f.Name);
}
else //文件，直接下载
{
DownLoadFile(ftpDir + "/" + f.Name, saveDir + "\" + f.Name);
}
}
}


#endregion


#region 文件信息结构
public struct FileStruct
{
public string Flags;
public string Owner;
public string Group;
public bool IsDirectory;
public DateTime CreateTime;
public string Name;
}
public enum FileListStyle
{
UnixStyle,
WindowsStyle,
Unknown
}
#endregion

public void down_load_Click(object sender, EventArgs e)
{
/// <param name="ftpUri">ftp文件路径，如"ftp://localhost/test.txt"</param>
/// <param name="saveFile">保存文件的路径，如C:\test.txt</param>

string xz="ftp://192.100.135.5/PIMExpress_mm/10002/372565/e676ccb4-8f30-49f2-91e6-34facca7d4f7";
string cf_wz="C:\L柜.dwg";
DownLoadFile(xz,cf_wz);
MessageBox.Show ("下载完毕");
}

}