public void Retrieve()
{
if (!_alreadyRetrieved)
{
//construct this object before the lock so there's no chance of deadlocking
//with the parent data source (because we are accessing it's tags at the
//same time as it's trying to get the pixel data).
var retriever = new FramePixelDataRetriever(this);
lock (_syncLock)
{
if (!_alreadyRetrieved)
{
AbortAttemptIfNecessary();
try
{
ResetAttemptData();
_retrievesAttempted++;
var start = DateTime.Now;
_framePixelData = retriever.Retrieve();
var end = DateTime.Now;
_lastRetrievePerformanceInfo =
new StreamingPerformanceInfo(start, end, _framePixelData.BytesReceived);
_alreadyRetrieved = true;
}
catch (Exception ex)
{
_lastError = ex;
throw;
}
}
}
}
}
public void Retrieve()
{
if (!_alreadyRetrieved)
{
//construct this object before the lock so there's no chance of deadlocking
//with the parent data source (because we are accessing it's tags at the
//same time as it's trying to get the pixel data).
var retriever = new FramePixelDataRetriever(this);
lock (_syncLock)
{
if (!_alreadyRetrieved)
{
AbortAttemptIfNecessary();
try
{
ResetAttemptData();
_retrievesAttempted++;
var start = DateTime.Now;
_framePixelData = retriever.Retrieve();
var end = DateTime.Now;
_lastRetrievePerformanceInfo =
new StreamingPerformanceInfo(start, end, _framePixelData.BytesReceived);
_alreadyRetrieved = true;
}
catch (Exception ex)
{
_lastError = ex;
throw;
}
}
}
}
}