Question

C#做FTP上传时，怎么判断 文件路径 是否存在

Answer 1

var request = (FtpWebRequest)WebRequest.Create
("<a href="ftp://ftp.domain.com/doesntexist.txt"" target="_blank">ftp://ftp.domain.com/doesntexist.txt"</a>);
request.Credentials = new NetworkCredential("user", "pass");
request.Method = WebRequestMethods.Ftp.GetFileSize;

try
{
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
FtpWebResponse response = (FtpWebResponse)ex.Response;
if (response.StatusCode ==
FtpStatusCode.ActionNotTakenFileUnavailable)
{
//Does not exist
}
}