private void UpdateNeighbors(GridNode <T, U> node)
{
Dictionary <GridDirection, GridNode <T, U> > neighbors = GetNeighbors(node);
foreach (KeyValuePair <GridDirection, GridNode <T, U> > entry in neighbors)
{
GridDirection direction = entry.Key;
GridNode <T, U> neighbor = entry.Value;
node.Neighbors[direction] = neighbor;
neighbor.Neighbors[direction.Reverse()] = node;
}
}