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[VB.NET] TreeView event SelectedNodeChange fires twice

Posted on 2009-05-19
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Last Modified: 2012-05-07
On a webpage I have a TreeView which works together with a DetailsView (for details about the selected item in the TreeView) and a GridView (to display a list of child records for the selected item in the TreeView).

To be able to update the DetailsView and the GridView when the selection changes in the TreeView, I trap the SelectedNodeChange event for the TreeView.

Now it turns out that this SelectedNodeChange event is always fired twice, and thus the DetailsView and the GridView are populated twice as well.

What might be the reason for this double event firing?

Protected Sub wsTreeView_SelectedNodeChange(ByVal sender As TreeView, ByVal e As EventArgs) Handles wsTreeView.SelectedNodeChanged
 
        ' refill GridView for newly selected TreeView branche
        wsTreeGridView.ResetFilter()
        FillTreeGrid(sender.SelectedValue, False)
 
        ' bind DetailsView again in read-only mode
        wsTreeDetailsView.ChangeMode(DetailsViewMode.ReadOnly)
        wsTreeDetailsView.PrimaryKeyValue = Me.SelectedTreeItemID
        BindCategoryDetailsView()
 
    End Sub

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Question by:MarjaR
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Nikkoli earned 125 total points
ID: 24421571
Do you register the event somewhere else in your code?

Having "Handles wsTreeView.SelectedNodeChanged" takes care of registering, so if you also create an event handler you end up with 2 registrations and therefore 2 events.
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by:rdoran0928
rdoran0928 earned 125 total points
ID: 24421649
If you have OnSelectedNodeChanged in your .aspx file like the following, the event will fire twice:

        <asp:TreeView ID="wsTreeView" runat="server" OnSelectedNodeChanged="wsTreeView_SelectedNodeChange">
        </asp:TreeView>
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by:MarjaR
ID: 31582968
You both hit the nail right on the nose. Thank you!
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