private bool check()
{
if (this.N == 0)
{
if (this.first != null)
{
return(false);
}
}
else if (this.N == 1)
{
if (this.first == null)
{
return(false);
}
if (this.first.next != null)
{
return(false);
}
}
else if (this.first.next == null)
{
return(false);
}
int num = 0;
for (LinkedStack.Node node = this.first; node != null; node = node.next)
{
num++;
}
return(num == this.N);
}
public void Push(object obj)
{
// save a link to the list
LinkedStack.Node node = this.first;
// create a new node for the beginning
this.first = new Node(this, null);
// set value
this.first.item = obj;
// set next link
this.first.next = node;
this.N++;
ArgumentOutOfRangeException();
}
public object Pop()
{
if (IsEmpty)
{
throw new NotSupportedException("Stack underflow");
}
// save current 1st value
object result = this.first.item;
// update first to former second
this.first = this.first.next;
// decrease count
this.N--;
ArgumentOutOfRangeException();
return(result);
}
internal Node(LinkedStack linkedStack, Node next)
{
parent = linkedStack;
item = null;
this.next = next;
}
internal static object GetNodeObject(LinkedStack.Node node)
{
return(node.item);
}
public void Reset()
{
current = parentStack.first;
}
internal ListIterator(LinkedStack linkedStack)
{
this.parentStack = linkedStack;
this.current = linkedStack.first;
}
public LinkedStack()
{
this.first = null;
this.N = 0;
ArgumentOutOfRangeException();
}