我正在使用此FtpClient库从WinForms应用程序连接到大型机。我正在使用thread.Sleep让线程在开始读取之前等待响应,否则它会冻结。有替代方法吗?
public void Login()
{
if (this.loggedin) this.Close();
Debug.WriteLine("Opening connection to " + this.server, "FtpClient");
IPAddress addr = null;
IPEndPoint ep = null;
try
{
this.clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
addr = Dns.Resolve(this.server).AddressList[0];
ep = new IPEndPoint(addr, this.port);
this.clientSocket.Connect(ep);
}
catch (Exception ex)
{
// doubtfull
if (this.clientSocket != null && this.clientSocket.Connected) this.clientSocket.Close();
throw new FtpException("Couldn't connect to remote server", ex);
}
**Thread.Sleep(4000);**
this.readResponse();
...
}
private void readResponse()
{
this.message = "";
this.result = this.readLine();
if (this.result.Length > 3)
this.resultCode = int.Parse(this.result.Substring(0, 3));
else
this.result = null;
}
private string readLine()
{
while (true)
{
this.bytes = clientSocket.Receive(this.buffer, this.buffer.Length, 0);
this.message += ASCII.GetString(this.buffer, 0, this.bytes);
if (this.bytes < this.buffer.Length) break;
}
string[] msg = this.message.Split('\n');
if (this.message.Length > 2)
{
this.message = msg[msg.Length - 2];
try { response = msg[msg.Length - 3]; }
catch { }
}
else
{
this.message = msg[0];
}
if (this.message.Length > 4 && !this.message.Substring(3, 1).Equals(" ")) return this.readLine();
if (this.verboseDebugging)
{
for (int i = 0; i < msg.Length - 1; i++)
{
Debug.Write(msg[i], "FtpClient");
}
}
return message;
}
public void sendCommand(String command)
{
if (this.verboseDebugging) Debug.WriteLine(command, "FtpClient");
Byte[] cmdBytes = Encoding.ASCII.GetBytes((command + "\r\n").ToCharArray());
clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
this.readResponse();
}
答案 0 :(得分:4)
使用异步编程模型:
socket.BeginConnect(ep, new AsyncCallback(Connected), socket);
void Connected (IAsyncResult result)
{
var socket = (Socket)result.AsyncState;
// do the stuff
socket.EndConnect(result);
}
答案 1 :(得分:0)
是的,如果您可以使用.NET 4.0,则可以使用任务API。
阅读本文后,您可以了解更多信息:http://www.codethinked.com/post/2010/01/25/NET-40-and-SystemThreadingTasks.aspx
它为您提供了一种创建流程的方法,在该流程中,任务等待上一个任务结束。看一看!
答案 2 :(得分:0)
写Thread.Sleep()
确实是一种不好的做法。
如果您确实在使用FTP客户端,请使用FtpWebRequest BeginGetResponse(asynccallback, object)
并传递readResonse
作为回调。当响应准备好时,它将被准确调用。