treeview控件中的checkbox级联选择

treeview控件中的checkbox级联选择。

1. private void setNodeCheckState(TreeNode tn){
2.             foreach(TreeNode t in tn.Nodes)
3.             {
4.                 t.Checked = tn.Checked;
5.                 setNodeCheckState(t);
6.             }
7.         }
8. private void setParentNodeCheckState(TreeNode tn)
9.         {
10.             if (tn.Level > 0)
11.             {
12.                 if (tn.Checked)
13.                 {
14.                     foreach (TreeNode stn in tn.Parent.Nodes)
15.                     {
16.                         if (stn.Checked != tn.Checked)
17.                             return;
18.                     }
19.                     tn.Parent.Checked = tn.Checked;
20.                     setParentNodeCheckState(tn.Parent);
21.                 }
22.                 else
23.                 {
24.                     tn.Parent.Checked = tn.Checked;
25.                     setParentNodeCheckState(tn.Parent);
26.                 }
27.             }
28.         }
29. private void tv1_AfterCheck(object sender, TreeViewEventArgs e)
30.         {
31.             if (e.Action != TreeViewAction.Unknown)
32.             {
33.                 setNodeCheckState(e.Node);
34.                 setParentNodeCheckState(e.Node);
35.             }
36.         }