使用FtpWebRequest和FtpWebResponse类。 有关更多信息，请参阅

https://msdn.microsoft.com/en-us/library/ms229718.aspx

码

上传（来源： http ： //msdn.microsoft.com/de-de/library/ms229715.aspx ）：

 namespace Examples.System.Net { public class WebRequestGetExample { public static void Main () { // Get the object used to communicate with the server. FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://www.contoso.com/test.htm"); request.Method = WebRequestMethods.Ftp.UploadFile; // This example assumes the FTP site uses anonymous logon. request.Credentials = new NetworkCredential ("anonymous","janeDoe@contoso.com"); // Copy the contents of the file to the request stream. StreamReader sourceStream = new StreamReader("testfile.txt"); byte [] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd()); sourceStream.Close(); request.ContentLength = fileContents.Length; Stream requestStream = request.GetRequestStream(); requestStream.Write(fileContents, 0, fileContents.Length); requestStream.Close(); FtpWebResponse response = (FtpWebResponse)request.GetResponse(); Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription); response.Close(); } } } } 

下载（来源： http ： //msdn.microsoft.com/en-US/library/ms229711.aspx ）：

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 namespace Examples.System.Net { public class WebRequestGetExample { public static void Main () { // Get the object used to communicate with the server. FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://www.contoso.com/test.htm"); request.Method = WebRequestMethods.Ftp.DownloadFile; // This example assumes the FTP site uses anonymous logon. request.Credentials = new NetworkCredential ("anonymous","janeDoe@contoso.com"); FtpWebResponse response = (FtpWebResponse)request.GetResponse(); Stream responseStream = response.GetResponseStream(); StreamReader reader = new StreamReader(responseStream); Console.WriteLine(reader.ReadToEnd()); Console.WriteLine("Download Complete, status {0}", response.StatusDescription); reader.Close(); response.Close(); } } }