C#客户端直接从服务器下载文件到本地

public class FtpDownload
{
public static void DownLoad(string FtpPath)
{
/*首先从配置文件读取ftp的登录信息*/
string TempFolderPath = System.Configuration.ConfigurationManager.AppSettings["TempFolderPath"].ToString();
string FtpUserName = System.Configuration.ConfigurationManager.AppSettings["FtpUserName"].ToString();
string FtpPassWord = System.Configuration.ConfigurationManager.AppSettings["FtpPassWord"].ToString();
string LocalFileExistsOperation = System.Configuration.ConfigurationManager.AppSettings["LocalFileExistsOperation"].ToString();

Uri uri = new Uri(FtpPath);
string FileName = Path.GetFullPath(TempFolderPath) + Path.DirectorySeparatorChar.ToString() + Path.GetFileName(uri.LocalPath);

//创建一个文件流
FileStream fs = null;
Stream responseStream = null;
try
{
//创建一个与FTP服务器联系的FtpWebRequest对象
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
//设置请求的方法是FTP文件下载
request.Method = WebRequestMethods.Ftp.DownloadFile;

//连接登录FTP服务器
request.Credentials = new NetworkCredential(FtpUserName, FtpPassWord);

//获取一个请求响应对象
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
//获取请求的响应流
responseStream = response.GetResponseStream();

//判断本地文件是否存在，如果存在，则打开和重写本地文件

if (File.Exists(FileName))
{
if (LocalFileExistsOperation == "write")
{
fs = File.Open(FileName, FileMode.Open, FileAccess.ReadWrite);

}
}

//判断本地文件是否存在，如果不存在，则创建本地文件
else
{
fs = File.Create(FileName);
}

if (fs != null)
{

int buffer_count = 65536;
byte[] buffer = new byte[buffer_count];
int size = 0;
while ((size = responseStream.Read(buffer, 0, buffer_count)) > 0)
{
fs.Write(buffer, 0, size);

}
fs.Flush();
fs.Close();
responseStream.Close();
}
}
finally
{
if (fs != null)
fs.Close();
if (responseStream != null)
responseStream.Close();
}

}
}