public IEdge CreateEdge(INode iSource, INode iTarget, EdgeData iData = null)
{
if (iSource == null || iTarget == null)
{
return(null);
}
var tNewEdge = mCreator.CreateEdge(m_nextEdgeId.ToString(), iSource, iTarget, iData);
m_nextEdgeId++;
AddEdge(tNewEdge);
return(tNewEdge);
}