Detect client disconnect with HttpListener

Question

I have an application that uses HttpListener, I need to know when the client disconnected, right now I have all my code inside a try/catch block which is pretty ugly and not a g

Answer 1

I'm having the same problem, I do a long sql query, and if user keeps pressing F5, it blows up.

HttpListener do not expose its underlying socket so you can poll it.

So I managed this workaround:

IDbCommand cmd = LongSqlQuery();
while (!taskCompleted)
{
    try
    {
        //send disposable data at times to check connection
        byte[] dummy = new byte[1] { 0xFF };
        outputStream.Write(dummy,0,1);

        Task.Delay(100).Wait();
    }
    catch
    {
        //Client disconnect
        cmd.Cancel();
    }
}

//Redirect client to results page
response.Redirect("http://yourserver.com/results?query=yourquery");