问题描述
我的ftp使用有问题，在一个窗口服务。我已经通过FTP定时作业来发送的文件。在一段时间后我遇到超时（频率一周一次或者每月一次），并继续直到我重新启动我的Windows服务。
I am having problem with ftp, in a windows service. I have scheduled a job to sent files through the ftp. Once in a while i'm having timeout (frequency once a week or maybe once a month), and it continues till i restart my windows service.
系统.Net.WebException：该操作已超时
我处理异常，并在最后我关闭所有打开的FTP会话
I'm handling the exception and in finally i close any opened ftp sessions.
try
{
string uri = String.Format("ftp://{0}/{1}/{2}", server, download, file);
Uri serverUri = new Uri(uri);
if (serverUri.Scheme != Uri.UriSchemeFtp)
{
return;
}
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
reqFTP.Credentials = new NetworkCredential(username, password);
reqFTP.KeepAlive = false;
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.EnableSsl = false;
reqFTP.Proxy = null;
reqFTP.UsePassive = true;
reqFTP.Timeout = Settings.Default.TimeOut;
reqFTP.ReadWriteTimeout = Settings.Default.TimeOut;
response = (FtpWebResponse)reqFTP.GetResponse();
responseStream = response.GetResponseStream();
using (FileStream writeStream = new FileStream(path + file, FileMode.Create))
{
int Length = 10240;
Byte[] buffer = new Byte[Length];
int bytesRead = responseStream.Read(buffer, 0, Length);
while (bytesRead > 0)
{
writeStream.Write(buffer, 0, bytesRead);
bytesRead = responseStream.Read(buffer, 0, Length);
}
}
response.Close();
}
catch (WebException wEx)
{
LogDatabase.WriteLog("Download File", wEx.ToString(), "Download File");
}
finally
{
if (response != null)
{
response.Close();
}
if (responseStream != null)
{
responseStream.Close();
}
}
任何想法？
Any ideas ?
日Thnx提前。
推荐答案
为什么你不能把所有这一切在一个循环？然后，如果你有一个错误，环刚返回并再次尝试。
Why can't you put this all in a loop? Then, if you have an error, the loop just goes back and tries again.
另外，为什么你设置的KeepAlive 选项设置为假
Also, why have you set the KeepAlive option to false?
我这个打逛了一会儿，并把它变成一个类，所以我可以更好地看到它，但没有做任何测试。我班确实在后台线程，这当然是你想做的事，如果你希望能够在所有与此有关沟通东西FTP呼叫。
I played around with this for a short while and put it into a class so I could see it better, but did not do any testing on it. My class does the FTP call in a background thread, which is certainly something you'd want to do if you wanted to be able to communicate with this at all.
我当然不提供任何保证，这将不至少有几个小故障工作！
I certainly give no guarantee that this will work without at least a few glitches!
class FtpRequests {
private const int BUF_SIZE = 10240;
private const string PASSWORD = "password";
private const string USERNAME = "username";
private const string SERVER = "yourserver.com";
private string path;
public FtpRequests() {
Cancel = false;
path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
}
public bool Cancel { get; set; }
public bool Complete { get; set; }
public Thread Thread1 { get; set; }
public int Timeout { get; set; }
public int ReadWriteTimeout { get; set; }
public void StartFtpDownload(string download, string file) {
string objString = string.Format("{0};{1}", download, file);
Thread1 = new Thread(startFtpThread);
Thread1.Name = string.Format("{0} download", file);
Thread1.IsBackground = true;
Thread1.Start(objString);
}
private void startFtpThread(object obj) {
Complete = false;
string objString = obj.ToString();
string[] split = objString.Split(';');
string download = split[0];
string file = split[1];
do {
try {
string uri = String.Format("ftp://{0}/{1}/{2}", SERVER, download, file);
Uri serverUri = new Uri(uri);
if (serverUri.Scheme != Uri.UriSchemeFtp) {
Cancel = true;
return;
}
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
reqFTP.Credentials = new NetworkCredential(USERNAME, PASSWORD);
reqFTP.KeepAlive = true;
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.EnableSsl = false;
reqFTP.Proxy = null;
reqFTP.UsePassive = true;
reqFTP.Timeout = Timeout;
reqFTP.ReadWriteTimeout = ReadWriteTimeout;
using (FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse()) {
using (Stream responseStream = response.GetResponseStream()) {
using (FileStream writeStream = new FileStream(path + file, FileMode.Create)) {
Byte[] buffer = new Byte[BUF_SIZE];
int bytesRead = responseStream.Read(buffer, 0, BUF_SIZE);
while (0 < bytesRead) {
writeStream.Write(buffer, 0, bytesRead);
bytesRead = responseStream.Read(buffer, 0, BUF_SIZE);
}
}
responseStream.Close();
}
response.Close();
Complete = true;
}
} catch (WebException wEx) {
LogDatabase.WriteLog("Download File", wEx.ToString(), "Download File");
}
} while (!Cancel && !Complete);
}
}
这篇关于在预定的窗口服务一致的FTP超时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！