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Question

我想获得一个服务器上的文件列表

CODE：

string ftpUserID = "user"; 
string ftpPassword = "password"; 
string ftpServerIP = "192.###.###.###"; 
string remoteDirectory = @"\Update\UpdateTest"; 
string localDirectory = @"C:\Updates"; 

string[] downloadFiles; 
StringBuilder result = new StringBuilder(); 
WebResponse response = null; 
StreamReader reader = null; 

FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" +  remoteDirectory)); 
reqFTP.UseBinary = true; 
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); 
reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; 
reqFTP.EnableSsl = true; 
reqFTP.Proxy = null; 
reqFTP.KeepAlive = true; 
reqFTP.UsePassive = true; 
response = reqFTP.GetResponse(); 
reader = new StreamReader(response.GetResponseStream()); 

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

我不断收到引发WebException错误说“无法连接到远程服务器”

这是错误的结果：

FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" +  remoteDirectory)); 

这是抛出一个System.NotSuportedException on reqFTP.Content and reqFTP.PreAuthenticate部分我想。

Answer 1

您提到，虽然它在代码中不可见，但您使用的是PreAuthenticate。这不支持FTP。

PreAuthenticate属性仅用于与WebRequest和WebResponse类的其他实现兼容，如msdn所示。