/// <summary>
/// 测试是否可以成功连接FTP和判断文件是否存在
/// </summary>
/// <param name="ftpServerFilePath">FTP上文件地址</param>
/// <param name="ftpUserId">FTP登陆用户名</param>
/// <param name="ftpPwd">FTP登陆密码</param>
/// <param name="errorMsg">返回错误消息</param>
/// <returns></returns>
private
bool
IsCanConnectFtp(
string
ftpServerFilePath,
string
ftpUserId,
string
ftpPwd,
out
string
errorMsg)
{
bool
flag =
true
;
FtpWebResponse ftpResponse =
null
;
FtpWebRequest ftpRequest =
null
;
errorMsg =
string
.Empty;
try
{
ftpRequest = (FtpWebRequest)FtpWebRequest.Create(
new
Uri(
"ftp://"
+ ftpServerFilePath.Replace(
"\\"
,
"/"
)));
ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;
ftpRequest.Timeout = 2 * 1000;
ftpRequest.Credentials =
new
NetworkCredential(ftpUserId, ftpPwd);
ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
}
catch
(WebException exception)
{
ftpResponse = (FtpWebResponse)exception.Response;
switch
(ftpResponse.StatusCode)
{
case
FtpStatusCode.ActionNotTakenFileUnavailable:
errorMsg =
"下载的文件不存在"
;
break
;
case
FtpStatusCode.ActionNotTakenFileUnavailableOrBusy:
errorMsg =
"下载的文件正在使用,请稍后再试"
;
break
;
default
:
errorMsg =
"发生未知错误"
;
break
;
}
flag =
false
;
}
catch
{
errorMsg =
"网络连接发生错误,请稍后再试"
;
flag =
true
;
}
finally
{
if
(ftpResponse !=
null
)
{
ftpResponse.Close();
}
}
return
flag;
}