开源.NET FTP组件edtFTPnet 用法

edtFTPnet官方网站：
http://www.enterprisedt.com/products/edtftpnet/

目前最新版本为2.2.3，下载后在bin目录中找到edtFTPnet.dll，在项目中添加引用。
下面为一些用法：

1、FTP服务器根目录为web，在它下面创建如下图示的目录和上传文件

FTPConnection.CommandEncoding = Encoding.GetEncoding("GBK") 指定GBK编码以支持中文文件名
FTPConnection.CreateDirectory() 创建指定目录
FTPConnection.ChangeWorkingDirectory() 切换到指定目录
FTPConnection.UploadFile() 上传文件

web
|-----L11
       |-----L21            
              |-----L31
                      |-----31.htm
              |-----21.htm
       |-----L22
       |-----11.htm
       |-----目录.txt

 private const string ftpServerIP = "xx.xx.xx.xx";
 private const string ftpRemotePath = "web";
 private const string ftpUserID = "user";
 private const string ftpPassword = "123";

 private void btnCreateAndUpload_Click(object sender, EventArgs e)
 {
     using (var conn = new FTPConnection
     {
         ServerAddress = ftpServerIP,
         ServerDirectory = ftpRemotePath,
         UserName = ftpUserID,
         Password = ftpPassword,
         CommandEncoding = Encoding.GetEncoding("GBK")
     })
     {
         conn.Connect();

         //创建目录L11
         conn.CreateDirectory("L11");

         //============切换当前工作目录到L11============
         conn.ChangeWorkingDirectory("L11");
         //上行代码也可以用conn.ServerDirectory = "L11";

         //上传"文档.txt"
         conn.UploadFile("文档.txt", "文档.txt");

         //创建子目录L21,L22
         conn.CreateDirectory("L21");
         conn.CreateDirectory("L22");

         //在当前工作目录L11上传文件"L11.htm"
         conn.UploadFile("11.htm", "11.htm");

         //============切换当前工作目录到L21============
         conn.ChangeWorkingDirectory("L21");

         //上传文件21.htm
         conn.UploadFile("21.htm", "21.htm");
         //创建目录L31
         conn.CreateDirectory("L31");

         //============切换当前工作目录到L31============
         conn.ChangeWorkingDirectory("L31");

         //上传文件31.htm
         conn.UploadFile("31.htm", "31.htm");
     }
 }

2、获取文件信息

FTPConnection.GetFileInfos() 获取文件和目录详细信息，结果的一个属性Dir为true表示为目录，否则为文件

 private void btnList_Click(object sender, EventArgs e)
 {
     using (var conn = new FTPConnection
     {
         ServerAddress = ftpServerIP,
         ServerDirectory = ftpRemotePath,
         UserName = ftpUserID,
         Password = ftpPassword,
         CommandEncoding = Encoding.GetEncoding("GBK")
     })
     {
         conn.Connect();
         //获取指定目录的所有子目录和文件信息
         conn.ChangeWorkingDirectory("L11/L21");
         var files1 = conn.GetFileInfos();
         ShowFileInfos(files1);
         /*结果如下：
          File, /web/L11/L21/21.htm, 21.htm, 11.2KB, 2013-9-26 14:51:00
          Dir, /web/L11/L21/L31, L31, 0KB, 2013-9-26 14:51:00
          */

         ////返回上级目录，例子中为web/L11
         conn.ChangeWorkingDirectoryUp();
         var files2 = conn.GetFileInfosRecursive();
         ShowFileInfos(files2);
         /*结果如下：
         File, /web/L11/11.htm, 11.htm, 59.4KB, 2013-9-26 14:51:00
         Dir, /web/L11/L21, L21, 0KB, 2013-9-26 14:51:00
         Dir, /web/L11/L22, L22, 0KB, 2013-9-26 14:51:00
         File, /web/L11/文档.txt, 文档.txt, 40.8KB, 2013-9-26 14:51:00
         File, /web/L11/L21/21.htm, 21.htm, 11.2KB, 2013-9-26 14:51:00
         Dir, /web/L11/L21/L31, L31, 0KB, 2013-9-26 14:51:00
         File, /web/L11/L21/L31/31.htm, 31.htm, 5.6KB, 2013-9-26 14:51:00
          */
     }
 }
 void ShowFileInfos(FTPFile[] files)
 {
     foreach (var file in files)
     {
         string info = string.Format("{0}, {1}, {2}, {3}KB, {4}",
             file.Dir ? "Dir" : "File", file.Path, file.Name, Math.Round(file.Size / 1024.0, 1), file.LastModified);
         richTextBox1.AppendText(info + "\r\n");
     }
     richTextBox1.AppendText("\r\n");
 }

其中递归获取指定目录的所有子目录和文件信息的扩展方法GetFileInfosRecursive如下：

 public static class FtpClientExtensions
 {
     ///
     /// 递归获取目录的所有子目录和文件信息
     ///
     public static FTPFile[] GetFileInfosRecursive(this FTPConnection conn)
     {
         var resultList = new List();
         var fileInfos = conn.GetFileInfos();
         resultList.AddRange(fileInfos);
         foreach (var fileInfo in fileInfos)
         {
             if (fileInfo.Dir)
             {
                 conn.ServerDirectory = fileInfo.Path;
                 resultList.AddRange(conn.GetFileInfosRecursive());
             }
         }
         return resultList.ToArray();
     }
     ///
     /// 递归删除目录(包括所有子目录和文件信息)
     ///
     public static void DeleteDirectoryRecursive(this FTPConnection conn, string directoryName)
     {
         conn.ChangeWorkingDirectory(directoryName);
         var fileInfos = conn.GetFileInfos();
         foreach (var fileInfo in fileInfos)
         {
             if (fileInfo.Dir)
                 conn.DeleteDirectoryRecursive(fileInfo.Name);
             else
                 conn.DeleteFile(fileInfo.Name);
         }
         conn.ChangeWorkingDirectoryUp();
         conn.DeleteDirectory(directoryName);
     }
 }

3、删除目录及所有子目录和文件

FTPConnection.DeleteDirectory()当删除的目录不为空时，会出错，需递归删除，
递归删除目录扩展方法DeleteDirectoryRecursive见上面类FtpClientExtensions

 private void btnDelete_Click(object sender, EventArgs e)
 {
     using (var conn = new FTPConnection
     {
         ServerAddress = ftpServerIP,
         ServerDirectory = ftpRemotePath,
         UserName = ftpUserID,
         Password = ftpPassword,
         CommandEncoding = Encoding.GetEncoding("GBK")
     })
     {
         conn.Connect();
         //递归删除目录及所有子目录和文件
         conn.DeleteDirectoryRecursive("L11");
         //如果删除单个文件，路径为当前目录的相对路径
         //conn.DeleteFile("L11/11.htm");
     }
 }