/// <summary>
/// private scan method for a queue item
/// </summary>
/// <param name="scannerQueueObject"></param>
private void Scan(ScannerQueueObject scannerQueueObject)
{
ScanCancellationToken.ThrowIfCancellationRequested();
try
{
using (var tcpClient = new TcpClient())
{
var timeout = TimeSpan.FromSeconds(10);
tcpClient.ReceiveTimeout = (int)timeout.TotalMilliseconds;
tcpClient.SendTimeout = (int)timeout.TotalMilliseconds;
var asyncResult = tcpClient.BeginConnect(scannerQueueObject.IPAddress.ToString(), scannerQueueObject.Port, null, null);
var waitHandle = asyncResult.AsyncWaitHandle;
try
{
if (!asyncResult.AsyncWaitHandle.WaitOne(timeout, false))
{
tcpClient.Close();
scannerQueueObject.Status = PortStatus.Closed;
}
else
{
scannerQueueObject.Status = tcpClient.Connected ? PortStatus.Open : PortStatus.Closed;
}
tcpClient.EndConnect(asyncResult);
}
finally
{
waitHandle.Close();
}
}
}
catch
{
scannerQueueObject.Status = PortStatus.Closed;
}
OnPortCheckCompleted?.Invoke(this, new PortCheckCompletedEventArgs
{
IPAddress = scannerQueueObject.IPAddress,
Port = scannerQueueObject.Port,
Status = scannerQueueObject.Status
});
}
/// <summary>
/// Creates and start a worker
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns></returns>
private Task CreateWorker(CancellationToken cancellationToken)
{
return(Task.Factory.StartNew(() =>
{
while (!ScannerQueues.IsEmpty && ScannerQueues.TryDequeue(out ScannerQueueObject scannerQueueObject))
{
ScanCancellationToken.ThrowIfCancellationRequested();
cancellationToken.ThrowIfCancellationRequested();
Scan(scannerQueueObject);
}
if (ScannerQueues.IsEmpty)
{
OnFinished?.Invoke(this, new EventArgs {
});
}
}, ScanCancellationToken));
}
