Dynamo.Graph.Workspaces.WorkspaceModel.SendModelEvent C# (CSharp) Method

        internal void SendModelEvent(Guid modelGuid, string eventName, int value)
        {
            var retrievedModel = GetModelInternal(modelGuid);
            if (retrievedModel == null)
                throw new InvalidOperationException("SendModelEvent: Model not found");

            var handled = false;
            var nodeModel = retrievedModel as NodeModel;
            if (nodeModel != null)
            {
                using (new UndoRedoRecorder.ModelModificationUndoHelper(undoRecorder, nodeModel))
                {
                    handled = nodeModel.HandleModelEvent(eventName, value, undoRecorder);
                }
            }
            else
            {
                // Perform generic undo recording for models other than node.
                RecordModelForModification(retrievedModel, UndoRecorder);
                handled = retrievedModel.HandleModelEvent(eventName, value, undoRecorder);
            }

            if (!handled) // Method call was not handled by any derived class.
            {
                string type = retrievedModel.GetType().FullName;
                string message = string.Format(
                    "ModelBase.HandleModelEvent call not handled.\n\n" +
                    "Model type: {0}\n" +
                    "Model GUID: {1}\n" +
                    "Event name: {2}",
                    type, modelGuid, eventName);

                // All 'HandleModelEvent' calls must be handled by one of
                // the ModelBase derived classes that the 'SendModelEvent'
                // is intended for.
                throw new InvalidOperationException(message);
            }

            HasUnsavedChanges = true;
        }