/// <summary>
/// Fetches the specified properties for an item.
/// </summary>
private Opc.Da.ItemProperty[] GetProperties(
CacheItem item,
PropertyID[] propertyIDs,
bool returnValues)
{
// check for trivial case.
if (item == null)
{
return(null);
}
// fetch properties.
ItemPropertyCollection properties = null;
if (propertyIDs == null)
{
properties = item.GetAvailableProperties(returnValues);
}
else
{
properties = item.GetAvailableProperties(propertyIDs, returnValues);
}
// convert collection to array.
return((Opc.Da.ItemProperty[])properties.ToArray(typeof(Opc.Da.ItemProperty)));
}
/// <summary>
/// Fetches the specified properties for an item.
/// </summary>
public ItemPropertyCollection GetProperties(
ItemIdentifier itemID,
PropertyID[] propertyIDs,
bool returnValues)
{
if (itemID == null)
{
throw new ArgumentNullException("itemID");
}
lock (this)
{
if (m_disposed)
{
throw new ObjectDisposedException("Opc.Da.Cache");
}
ItemPropertyCollection properties = new ItemPropertyCollection();
properties.ItemName = itemID.ItemName;
properties.ItemPath = itemID.ItemPath;
properties.ResultID = ResultID.S_OK;
properties.DiagnosticInfo = null;
if (itemID.ItemName == null || itemID.ItemName.Length == 0)
{
properties.ResultID = ResultID.Da.E_INVALID_ITEM_NAME;
return(properties);
}
// find the item.
CacheItem item = (CacheItem)m_items[itemID.ItemName];
if (item == null)
{
properties.ResultID = ResultID.Da.E_UNKNOWN_ITEM_NAME;
return(properties);
}
// get the properties.
if (propertyIDs == null)
{
properties = item.GetAvailableProperties(returnValues);
}
else
{
properties = item.GetAvailableProperties(propertyIDs, returnValues);
}
// return result.
return(properties);
}
}
/// <summary>
/// Fetches the specified properties for an item.
/// </summary>
private Opc.Da.ItemProperty[] GetProperties(
CacheItem item,
PropertyID[] propertyIDs,
bool returnValues)
{
// check for trivial case.
if (item == null)
{
return null;
}
// fetch properties.
ItemPropertyCollection properties = null;
if (propertyIDs == null)
{
properties = item.GetAvailableProperties(returnValues);
}
else
{
properties = item.GetAvailableProperties(propertyIDs, returnValues);
}
// convert collection to array.
return (Opc.Da.ItemProperty[])properties.ToArray(typeof(Opc.Da.ItemProperty));
}