我想用自定义类包装List类.至于现在我有这样的事情;
public class PriorityListOfNodes
{
private List<Node> list_;
private IComparer<Node> sorter_;
public List<Node> List_ {
get {return list_;}
set {list_ = value;}
}
public PriorityListOfNodes ()
{
sorter_ = new NodeSorter_fValueDescending ();
}
public Node PopFromEnd ()
{
Node temp = new Node (list_ [list_.Count - 1]);
list_.RemoveAt (list_.Count - 1);
return temp;
}
public Node PeekFromEnd ()
{
return list_ [list_.Count - 1];
}
public void Add (ref Node toAdd)
{
Debug.Log (toAdd);
list_.Add (toAdd);
list_.Sort (sorter_);
}
}
我什么时候做
Node temp = new Node(10,20); //custom constructor PriorityListOfNodes l = new PriorityListOfNodes(); l.add(temp);
我得到运行时异常：
Object reference not set to an instance of an object
我也试过没有参考,但结果相同.我在这做错了什么？
解决方法
您永远不会实际实例化List< Node>.
public PriorityListOfNodes ()
{
sorter_ = new NodeSorter_fValueDescending ();
list_ = new List<Node>();
}
