C# Winform 中使用FTP实现软件自动更新功能

实现思路：通过访问FTP站点，将站点中的文件下载至软件指定位置。

第一步：FTP站点中导入需要下载更新的程序文件，并添加配置文件(配置下载后文件的下载路径)，如下图所示：

第二步：Winfrom程序读取FTP站点服务下载配置文件，解析需要下载的文件列表

第三步：循环下载更新程序文件，下载至指定位置即可

IIS中创建FTP站点略(测试访问如下图)

具体实现可参考如下所示代码：

FTP下载操作方法：

 /// <summary>

        /// 从ftp服务器上下载文件的功能

        /// </summary>

        /// <param name="fileName">文件名称</param>

        public void Download(string fileName)

        {

            FtpWebRequest reqFTP;

            try

            {

                string filePath = Application.StartupPath;

                FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);

                string str=FTPFilePath + ":" + FtpServerPort + "/" + fileName;

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(str));

                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

                reqFTP.UseBinary = true;

                reqFTP.Credentials = new NetworkCredential(FtpServerUserName, FtpServerPassword);

                reqFTP.UsePassive = false;

                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)

            {

                throw ex;

            }

        }

        /// <summary>

        /// 从ftp服务器上下载文件的功能

        /// </summary>

        /// <param name="fileName">文件名称</param>

        /// <param name="targetPath">存放目标位置+文件名称</param>

        public void Download(string fileName,string targetPath)

        {

            FtpWebRequest reqFTP;

            try

            {

                string filePath = Application.StartupPath;

                //FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);

                FileStream outputStream = new FileStream(targetPath, FileMode.Create);

                string str = FTPFilePath + ":" + FtpServerPort + "/" + fileName;

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(str));

                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

                reqFTP.UseBinary = true;

                reqFTP.Credentials = new NetworkCredential(FtpServerUserName, FtpServerPassword);

                reqFTP.UsePassive = false;

                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)

            {

                throw ex;

            }

        }

XML解析方法：

using System.Collections.Generic;

using System.Xml;

namespace AutoUpdate

{

    /// <summary>

    /// 用于XML操作

    /// </summary>

    public class XmlHelper

    {

        private static XmlHelper instance;

        public static XmlHelper Instance

        {

            get

            {

                if (instance == null) instance = new XmlHelper();

                return XmlHelper.instance;

            }

        }

        /// <summary>

        /// 获取指定节点所有子节点相关属性

        /// </summary>

        /// <param name="path">文件路径</param>

        /// <param name="nodePath">节点路径</param>

        /// <returns>List<UpdateList></returns>

        public List<UpdateList> GetUpdateList(string path, string selectNode)

        {

            XmlDocument doc = new XmlDocument();

            doc.Load(path);

            XmlNode node = doc.SelectSingleNode(selectNode);

            List<UpdateList> list = new List<UpdateList>();

            foreach (XmlNode item in node)

            {

                UpdateList config = new UpdateList();

                config.NAME = item.Attributes["NAME"].Value;

                config.PATH = item.Attributes["PATH"].Value;

                list.Add(config);

            }

            return list;

        }

    }

    /// <summary>

    /// config.xml item节点属性描述

    /// </summary>

    public class UpdateList

    {

        public string PATH { get; set; }

        public string NAME { get; set; }

    }

}

测试调用：

private void btnUpdate_Click(object sender, EventArgs e)

        {

            //第一步下载需要更新的配置文件

            string filepath = "UpdateList.xml";

            UpdateHelper.Instance.Download(filepath);

            //第二步 提供并解析配置文件(获取需要更新的文件名称、文件更新后的路径)

            string path = Application.StartupPath + "\\UpdateList.xml";

            List<UpdateList> list = XmlHelper.Instance.GetUpdateList(path, "Root");

            //第三步 循环下载文件到指定路径

            foreach (UpdateList item in list)

            {

                if (string.IsNullOrEmpty(item.PATH)) UpdateHelper.Instance.Download(item.NAME);//下载至根目录

                else //下载至指定目录

                {

                    string targetPath = Application.StartupPath + "\\" + item.PATH + "\\" + item.NAME;

                    UpdateHelper.Instance.Download(item.NAME, targetPath);

                }

            }

            MessageBox.Show("更新成功");

        }

巴特西

C# Winform 中使用FTP实现软件自动更新功能

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