如何判断TreeView的每一个节点有没有父节点？

Question

if Node.Parent = nil then
  ShowMessage('this node doesn't have parentnode')
else
beginend;

Answer 1

if treeview1.Selected.Parent=nil then

Answer 2

node:=treeview1.selected;
if node.parent<>nil then
  showmessage('has parent')
else
  showmessage('has't parent')

Answer 3

if Node.Level>1 then HasParentor if Node.Parent<>nil then HasParentotherif Node.HasChildren then