public DataItem addItem(string aTagName)
{
if (String.IsNullOrWhiteSpace(aTagName))
{
throw new ArgumentException("Item TagName is empty. ");
}
DataItem lItem = new DataItem();
lItem.mTagName = aTagName;
lItem.mConnection = this;
if (Connected)
{
try
{
lItem.setValue(mPLC.Read(aTagName));
lItem.mAccess = EAccess.READ_WRITE;
}
catch (SimulationRuntimeException lExc)
{
throw new InvalidOperationException(ErrorCodeMessage(lExc.RuntimeErrorCode), lExc);
}
}
mItemListLock.EnterWriteLock();
//========================================
try
{
mItemList.Add(lItem);
mItemListChanged = true;
}
finally
{
//========================================
mItemListLock.ExitWriteLock();
}
ConnectionState += new EventHandler(lItem.onConnectionStateChanged);
lItem.raisePropertiesChanged();
lItem.updateValue();
return(lItem);
}