public void Add(WorkflowNode node)
{
if (node.Guid == Guid.Empty)
node.Guid = Guid.NewGuid();
if (Nodes.Any(x => x.Guid == node.Guid))
throw new Exception("a node with this guid already exists");
Nodes.Add(node);
}
protected internal WorkflowGraphMemo(WorkflowNode[] workflowNodes, Tuple<Pin, Pin>[] connections)
{
m_workflowNodes = workflowNodes;
m_connections = connections;
}