/// <summary>
/// Adds the meta data of requested variables to the dictionary
/// </summary>
internal static bool AddPlcObjects(ITreeNode plcObj, IDictionary <string, Tuple <int, PlcObject> > plcObjects, IEnumerable <string> values, string prefix = "", int offset = 0)
{
var updated = false;
foreach (var value in values.Where(x => !plcObjects.ContainsKey(x)))
{
var baseOffset = offset;
var item = value == "This" ? plcObj as PlcObject : plcObj.Get(new PlcMetaDataTreePath(value), ref baseOffset) as PlcObject;
if (item == null)
{
ExceptionThrowHelper.ThrowInvalidVariableException($"{plcObj.Name}.{value}");
}
var key = prefix + value;
if (!plcObjects.ContainsKey(key))
{
try
{
plcObjects.Add(key, new Tuple <int, PlcObject>(baseOffset, item));
}
catch (Exception)
{
// This could throw an exception if another thread has already added the object.
// but we could ignore this, becuase this would be the same object
}
updated = true;
}
if (item is PlcStruct plcStruct)
{
updated = AddPlcObjects(plcStruct, plcObjects, plcStruct.Childs.Select(child => child.Name), key + ".", baseOffset) || updated;
}
}
return(updated);
}