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：

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/// <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：

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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：

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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");         }