AIsOfCatan.Board.GetAllEdges C# (CSharp) Method

        public Edge[] GetAllEdges()
        {
            if(allEdges == null){
                HashSet<Edge> result = new HashSet<Edge>();
                for (int i = 0; i < 45; i++)
                {
                    this.GetAdjacentTiles(i).Where(j => this.IsLegalEdge(new Edge(i, j))).ForEach(j => result.Add(new Edge(i, j)));
                }
                allEdges = result.ToArray();
            }

            return allEdges.ToArray();
        }