A GraphNode class

GraphNode.cs

/*
https://msdn.microsoft.com/en-us/library/ms379574(v=vs.80).aspx

An Extensive Examination of Data Structures Using C# 2.0

Visual Studio 2005
 
Scott Mitchell
4GuysFromRolla.com
Update January 2005
*/

public class GraphNode<T> : Node<T>
{
    private List<int> costs;

    public GraphNode() : base() { }
    public GraphNode(T value) : base(value) { }
    public GraphNode(T value, NodeList<T> neighbors) : base(value, neighbors) { }

    new public NodeList<T> Neighbors
    {
        get
        {
            if (base.Neighbors == null)
                base.Neighbors = new NodeList<T>();

            return base.Neighbors;
        }            
    }

    public List<int> Costs
    {
        get
        {
            if (costs == null)
                costs = new List<int>();

            return costs;
        }
    }
}