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c# how to do ftp retry

Posted on 2010-09-19
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Last Modified: 2013-12-09
hi,

i was able to create a basic ftp client that is working, but i want to make it more robust.  one of the features i want to add is retry delay (The time between each retry).  unfortunately i couldn't find a lot of materials online.  can someone help me?  thanks.
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Question by:mmingfeilam
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8 Comments
 
LVL 29

Accepted Solution

by:
Gautham Janardhan earned 250 total points
ID: 33710888
you need to do something like

void DoFtpStuff()
        {
            try
            {
            }
            catch
            {
                // if exp then retry after a time period
                if (retry)
                {
                    System.Threading.Thread.Sleep(timeOut);
                    DoFtpStuff();
                }
            }
        }
0
 
LVL 32

Assisted Solution

by:Ephraim Wangoya
Ephraim Wangoya earned 250 total points
ID: 33711570
//add this to your using clause
using System.Threading;
//

 private void button1_Click(object sender, EventArgs e)
        {
            int i = 0;
            int trycount = 3;
            int delayms = 2000;  //milliseconds

            while (i < trycount)
            {
                try
                {
                    DoFtp();
                    break;
                }
                catch (Exception ex)
                {
                    if (i < trycount)
                    {
                        i++;
                        Thread.Sleep(delayms );
                    }
                    else
                        throw ex;
                }
            }
        }
0
 

Author Comment

by:mmingfeilam
ID: 33712194
ok, both of your solutions seems to work.  but i don't like the fact that the main thread will be blocking during the Sleep.  the application is not scalable.  do you think i can run the DoFtp() method in a worker thread called myThread, and just call myThread.Suspend()/Resume()/Join() to create the delay?  i would think i need some kind of timer to keep track of the delay.
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LVL 32

Expert Comment

by:Ephraim Wangoya
ID: 33712497
Using a thread will definitely make your program responsive, you can call sleep within the threads method. You dont need timers

string ErrorMsg = '';
Thread MyThread;

public void button1_Click(object sender, EventArgs e)        
        {                        
            MyThread= new Thread(new ThreadStart(DoSomeFTP));            
            MyThread.IsBackground = true;            
            MyThread.Start();        
        }  

private void DoSomeFTP()
        {
            int i = 0;
            int trycount = 3;
            int delayms = 2000;  //milliseconds

            while (i < trycount)
            {
                try
                {
                    //call the ftp methods you want
                    break;
                }
                catch (Exception ex)
                {
                    if (i < trycount)
                    {
                        i++;
                        Thread.Sleep(delayms); //this will block the thread
                    }
                    else
                        ErrorMsg = ex.Message;  //need to protect resource
            }
        }
0
 

Expert Comment

by:SanthoshVK
ID: 33714649
It is better to do the FTP functionalities in a BackgroundWorker object (which is nothing but a worker thread implementation of .NET) and let your UI subscribe fr events like OnConnect(), OnDisconnect(), OnTimeout() etc. These events are raised from the BackgroundWorker class.

If still not clear, please post back, I can give you a sample implementation.
0
 

Author Comment

by:mmingfeilam
ID: 33723294
i am not an expert at threading issues, but i believe BackgroudWorker threads are mainly for windows UI programming.  this FTP app i am building is being exposed as a web service or a windows service.  i have gotten the simple multi-threaded retry delay working thanks to ewangoya.  now i am thinking about using a ThreadPool to inprove performance.
0
 

Author Closing Comment

by:mmingfeilam
ID: 33762218
afsdws
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