C# 在ftp下载文件帮助类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;

namespace StandardClassifierUI
{
    public class FtpDownFile
    {
        private string ftpUserID = string.Empty;
        private string ftpPassword = string.Empty;
        private string ftpURI = string.Empty;
        private string ftpServerIP = string.Empty;

        /// 

        /// 连接FTP
        /// 
        /// FTP连接地址IP
        /// 用户名
        /// 密码
        public FtpDownFile(string FtpServerIP, string FtpUserID, string FtpPassword)
        {
            ftpServerIP = FtpServerIP;
            ftpUserID = FtpUserID;
            ftpPassword = FtpPassword;
            ftpURI = "ftp://" + ftpServerIP + "/";
        }
        /// 

        /// 下载文件
        /// 
        /// 本地文件地址(没有文件名)
        /// 本地文件名
        /// 下载的ftp的文件名
        public bool fileDownload(string localPath, string localFileName, string ftpFileName)
        {
            bool success = false;
            FtpWebRequest ftpWebRequest = null;
            FtpWebResponse ftpWebResponse = null;
            Stream ftpResponseStream = null;
            FileStream outputStream = null;
            try
            {
                string ftpPath = Path.Combine(localPath, localFileName);
                outputStream = new FileStream(ftpPath, FileMode.Create);
                string uri = ftpURI + ftpFileName;
                ftpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                ftpWebRequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                ftpWebRequest.UseBinary = true;
                ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
                ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
                ftpResponseStream = ftpWebResponse.GetResponseStream();
                long contentLength = ftpWebResponse.ContentLength;
                int bufferSize = 2048;
                byte[] buffer = new byte[2048];
                int readCount;
                readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
                }
                success = true;
            }
            catch (Exception ex)
            {
                success = false;
                throw ex;
            }
            finally
            {
                if (outputStream != null)
                {
                    outputStream.Close();
                }
                if (ftpResponseStream != null)
                {
                    ftpResponseStream.Close();
                }
                if (ftpWebResponse != null)
                {
                    ftpWebResponse.Close();
                }
            }
            return success;
        }

        /// 

        ///  获取当前目录下文件列表(仅文件)
        /// 
        /// 返回目录下文件
        public string[] GetFileList()//string mask
        {
            StringBuilder result = new StringBuilder();
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);

                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = reader.ReadLine();
                }
                result.Remove(result.ToString().LastIndexOf('\n'), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }
}