我在C# 3.5中使用一个类来进行所有FTP传输,效果很好,但是自从我升级到4框架后,出现了一些问题。
我在Google上搜索,但没有找到解决方案。
尤其是关于检查目录是否存在的方法:
public bool DirectoryExists(string directory)
{
bool directoryExists = false;
if (directory.Substring(0, 1) != "/")
directory = "/" + directory;
FtpWebRequest request = GetFtpWebRequest(host + directory, WebRequestMethods.Ftp.PrintWorkingDirectory);
try
{
using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
{
directoryExists = true;
}
}
catch (WebException)
{
directoryExists = false;
}
return directoryExists;
}
private FtpWebRequest GetFtpWebRequest(string url, string method)
{
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
request.UseBinary = true;
request.KeepAlive = true;
request.UsePassive = (mode == Modes.Passive);
request.Timeout = Timeout.Infinite;
request.ServicePoint.ConnectionLimit = 6;
request.ReadWriteTimeout = Timeout.Infinite;
if (credential == null)
credential = new NetworkCredential(login, password);
request.Credentials = credential;
request.Method = method;
return request;
}
方法DirectoryExists总是返回true(即使目录不存在),但仅适用于框架4,在此之前,如果目录不存在,则GetFtpWebRequest会引发异常。
有人遇到过这个问题吗?
请不要告诉我使用另一个库,因为我所有的程序都依赖于这个库,我不想更新所有的程序...