problem assigning treeview.selectedNode in C#

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I want to set treeView.selectedNode programlly in C# and I want to be occured the beforeSelect event while proccessing this assigning. but my question is what I describe below:
when I use the code bellow, the beforeSelect event occured and call it's function.

C#

this.treeView1.SelectedNode = treeView1.Nodes[Level1Index];
this.treeView1.SelectedNode=treeView1.SelectedNode.Nodes[Level2Index];

but when I use such as bellow It doese'nt occure.

C#

this.treeView1.SelectedNode = treeView1.Nodes[Level1Index].Nodes[Level2Index];

why?

Posted 27-Mar-13 0:14am

aliyehjoon

Updated 27-Mar-13 1:29am

Richard MacCutchan

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Richard MacCutchan 27-Mar-13 7:30am

Impossible to tell, you need to provide some more information about the actual valuse of your variables at the time this code is executed.

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phil.o · Answer 1 · 2013-03-27T01:32:00

You should assign your obtained nodes into variables so that you can see their content while debugging (F5).

C#

TreeViewNode node1 = treeView1.Nodes[Level1Index];
TreeViewNode node2 = treeView1.Nodes[Level2Index];

From here, see in the the debugger what your node1 and node2 variables contain ; you will have a better understanding about your problem.

Jegan Thiyagesan · Answer 2 · 2013-03-27T02:18:00

Hi,
I double checked, your scenario and when the SelectedNode is set regardless of its hierarchy, it always trigger the BeforeSelected event.

It is most likely that the

C#

treeView1.Nodes[Level1Index].Nodes[Level2Index];

is null. if it is null then the node will not be selected and so the BeforeSelected event will not be triggered.

Regards
Jegan

problem assigning treeview.selectedNode in C#

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