HttpWebResponse doesnt throws error when network not available

[Geniusg]

I am using a HttpWebResponse object to download a file from remote location. The problem is that while going through a loop to download the file, if the network goes off, then the code doesnt throws any exception.
I checked in .Net framework 1.0 and 1.1 and the same problem persists. Though in 2.0, i get an IOException.
Can anyone throw some light on this? i am not sure if there is anything fishy about my code or is this a problem with the frameworks 1.0 and 1.1

Thanks !!
- Gaurav

[Geniusg]

code snippet

do
{
      bytesSize = Response.Read(downBuffer, 0, downBuffer.Length);
      if (bytesSize > 0)
      {
            Local.Write(downBuffer, 0, bytesSize);
            if(!Response.CanRead)
                break;
            if (goPause == true)
        	break;
     }
}
while (bytesSize > 0);

If there is no network, the flow hangs on line# 3. I expect an exception.

[Plater]

I am assuming your Response object is of type NetworkStream? From the .GetResponseStr eam() function on the HttpWebResponse object?

I am guessing it has something to do with the timeout. I bet the underlying exception to the IOException is that there was a teimout waiting to read. The timeout wasn't added until .NET2.0
You could try checking the DataAvailable property before reading to make surethere is still data there to read

[Geniusg]

Hi Plater..
Thanks for replying..
The Response object is of type System.IO.Strea m. HttpWebResponse .GetResponseStr eam returns a type of Stream object, which doesnt has DataAvailable property :-(
I have found a workaround for this problem. Inside the loop, I check for bytesSize and if it = -1, i throw an IOException (assuming that network is down). I am testing this piece of code by pulling out the network cable from my system when the while-loop is running. Though this workaround seems to work for now, i am not sure if it a good thing to do !!
Any suggestions from your side?

Thanks !!
- Gaurav

[Plater]

HttpWebResponse .GetResponseStr eam returns a stream yes, but the actual data type is NetworkStream. You can type cast it.