In Windows Forms, add the selected Treeview value to ListBox.

1: layer-2 data in the Treeview. After the parent node is selected, all child nodes are automatically selected.

2: add layer 2 data to ListBox

3: if the data already exists in ListBox, do not add

4: You can delete the selected data in ListBox.

Class: treeviewcheck is used to automatically select all child nodes after the parent node is selected.

Code

 1 public static class treeviewcheck
2 {
3 /// <summary>
4 // series node checked attribute Control
5 /// </Summary>
6 /// <Param name = "E"> </param>
7 public static void checkcontrol (treevieweventargs E)
8 {
9 If (E. Action! = Treeviewaction. Unknown)
10 {
11 if (E. node! = NULL)
12 {
13 checkparentnode (E. node, E. node. Checked );
14}
15 if (E. node. nodes. Count> 0)
16 {
17 checkallchildnodes (E. node, E. node. Checked );
18}
19}
20}
21 # region private Method
22 // change the status of all sub-nodes
23 Private Static void checkallchildnodes (treenode Pn, bool ischecked)
24 {
25 foreach (treenode tn in PN. nodes)
26 {
27 tn. Checked = ischecked;
28 If (TN. nodes. Count> 0)
29 {
30 checkallchildnodes (TN, ischecked );
31}
32}
33}
34 // change the selected status of the parent node
35 Private Static void checkparentnode (treenode curnode, bool ischecked)
36 {
37 bool bchecked = true;
38 If (curnode. parent! = NULL)
39 {
40 foreach (treenode node in curnode. Parent. nodes)
41 {
42 if (node. Checked = false)
43 {
44 bchecked = false;
45 break;
46}
47}
48 if (bchecked)
49 {
50 curnode. Parent. Checked = true;
51 checkparentnode (curnode. Parent, true );
52}
53 else
54 {
55 curnode. Parent. Checked = false;
56 checkparentnode (curnode. Parent, false );
57}
58}
59}
60 # endregion
61}

Node selection or cancellation in Treeview:

 

    private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
        {
            TreeViewCheck.CheckControl(e);

        }

 

 

Add the value of the selected item in the Treeview to ListBox

Code

 Private void button#click (Object sender, eventargs E)
{

Foreach (treenode node in treeview1.nodes)
{

Foreach (treenode nd in node. nodes)
{
If (Nd. Checked)
{
If (verifynotexist (Nd. Text ))
{
Listbox1.items. Add (Nd. Text );
}
}
}
}
}

Public bool verifynotexist (string thenodetext)
{
// Facilitates the project in listbox1. If the project already exists, false is returned.
For (INT I = 0; I <listbox1.items. Count; I ++)
{
If (thenodetext = listbox1.items [I]. tostring ())
{
Return false;
}
}
// Returns true if it does not exist.
Return true;
}

 

// Delete the selected item

Code

    //ListBox.SelectedIndexCollection indices = listBox1.SelectedIndices;  

// int count = indices.Count;  

// listBox1.BeginUpdate();  

// for (int i = 0; count != 0; i++)  

// {  
//      listBox1.Items.RemoveAt(indices[0]);  

//      count--;  
//  }  

//listBox1.EndUpdate(); 

while (listBox1.SelectedIndex != -1)
            {

                listBox1.Items.Remove(listBox1.SelectedItem);

            }

 

 

 

Delete all items in ListBox

  listBox1.Items.Clear();