/// <summary>
/// Creates a server handle for the selected item and reads the data.
/// </summary>
private void DoItemRead()
{
// create item (if necessary).
TsCHdaItem item = m_trend.Items[m_item];
if (item == null)
{
item = m_trend.AddItem(m_item);
}
// get request parameters from controls.
TrendCTRL.Update(m_trend);
if (m_synchronous)
{
// read data.
TsCHdaAnnotationValueCollection[] results = m_trend.ReadAnnotations(new TsCHdaItem[] { item });
if (results == null || results.Length != 1)
{
////throw new InvalidResponseException();
}
// display results.
ItemsCTRL.Initialize(results);
// save results.
m_results = results;
}
else
{
// check if already waiting for results.
if (m_asyncSent)
{
return;
}
// begin read data.
OpcItemResult[] results = m_trend.ReadAnnotations(
new TsCHdaItem[] { item },
null,
new TsCHdaReadAnnotationsCompleteEventHandler(OnReadComplete),
out m_request);
if (results == null || results.Length != 1)
{
////throw new InvalidResponseException();
}
// display initial results.
AsyncResultsCTRL.Initialize(m_server, results);
m_asyncSent = true;
}
}
/// <summary>
/// Creates a server handle for the selected item and reads the data.
/// </summary>
private void DoItemRead()
{
// create item (if necessary).
TsCHdaItem item = mTrend_.Items[mItem_];
if (item == null)
{
item = mTrend_.AddItem(mItem_);
}
// get request parameters from controls.
trendCtrl_.Update(mTrend_);
if (mSynchronous_)
{
// read data.
TsCHdaAnnotationValueCollection[] results = mTrend_.ReadAnnotations(new TsCHdaItem[] { item });
if (results == null || results.Length != 1)
{
////throw new InvalidResponseException();
}
// display results.
itemsCtrl_.Initialize(results);
// save results.
mResults_ = results;
}
else
{
// check if already waiting for results.
if (mAsyncSent_)
{
return;
}
// begin read data.
OpcItemResult[] results = mTrend_.ReadAnnotations(
new TsCHdaItem[] { item },
null,
new TsCHdaReadAnnotationsCompleteEventHandler(OnReadComplete),
out mRequest_);
if (results == null || results.Length != 1)
{
////throw new InvalidResponseException();
}
// display initial results.
asyncResultsCtrl_.Initialize(mServer_, results);
mAsyncSent_ = true;
}
}