public bool Delete(object value)
{
if (Header == null)
{
return(false);
}
DoubleLinkedNode preNode = null;
DoubleLinkedNode visitingNode = Header;
while (visitingNode != null && !visitingNode.Value.Equals(value))
{
preNode = visitingNode;
visitingNode = visitingNode.NextNode;
}
if (visitingNode != null)
{
if (preNode == null)
{
if (visitingNode.NextNode != null)
{
Header = Header.NextNode;
Header.PrevNode = null;
}
else
{
Header = null;
Tailer = null;
}
}
else
{
if (visitingNode.NextNode != null)
{
preNode.NextNode = visitingNode.NextNode;
visitingNode.NextNode.PrevNode = preNode;
}
else
{
preNode.NextNode = null;
Tailer = preNode;
}
}
return(true);
}
else
{
return(false);
}
}
public bool Contains(object value)
{
DoubleLinkedNode visitingNode = Header;
while (visitingNode != null && !visitingNode.Value.Equals(value))
{
visitingNode = visitingNode.NextNode;
}
if (visitingNode == null)
{
return(false);
}
else
{
return(true);
}
}